CN112798375A

Movatterモバイル変換

Info

Publication number: CN112798375A
Application number: CN202110012719.7A
Authority: CN
Inventors: 张冀飞; 杨晓兵; 赵萌迪; 高欣
Original assignee: Beijing Customs Technology Center
Current assignee: Beijing Customs Technology Center
Priority date: 2021-01-06
Filing date: 2021-01-06
Publication date: 2021-05-14
Anticipated expiration: 2041-01-06
Also published as: CN112798375B

Abstract

The invention provides a detection device for harmful elements in a child toothbrush, which comprises a sampling box, wherein a supporting plate is fixedly connected to the upper position of any one side of the sampling box, a first power box is fixedly connected to one side of the supporting plate, a feeding hole is formed in the upper position of one side, close to the first power box, of the sampling box, limiting sliding grooves are formed in the lower surfaces of the top wall and the supporting plate in the sampling box, a first motor is fixedly connected to the inner wall of one side, far away from the sampling box, of the first power box, the driving end of the first motor is fixedly connected with a threaded rod, one end, far away from the first motor, of the threaded rod is rotatably connected with the inner wall of the sampling box, a sliding block is connected to the outer wall of. The device and the method of the invention can separately detect the materials of the toothbrush head and the toothbrush bristles, so that the detection result is more convincing and more accurate.

Description

Detection device and method for harmful elements in children toothbrush

Technical Field

The invention relates to the technical field of toothbrush safety detection, in particular to a device and a method for detecting harmful elements in a child toothbrush.

Background

The child-type toothbrush is designed for a child who is in development, and it is necessary to pay attention to selecting an appropriate toothbrush according to the age of the child, on the basis of learning a method of brushing teeth by the child. The size of the mouth also changes during the development of the body while the child is in development, and therefore the toothbrushes used at various ages of the child are different. The toothbrush for children is various in types and styles, and some toothbrushes are respectively specified to be suitable for the eruption stage of deciduous teeth, the dentition stage of deciduous teeth, the mixed dentition stage of deciduous teeth and the like; it is also indicated for children aged 3-6 years, 6-9 years, etc.; further, toothbrushes that are selectively used according to the condition of the oral cavity of children; some special shaped toothbrushes should be used if the oral cavity is worn with a fixed orthodontic appliance. Such as a toothbrush in the shape of a "V".

In the market, various children toothbrushes have various levels, but the quality cannot be effectively guaranteed, and the manufacturing materials of the existing children toothbrushes cannot be effectively guaranteed, so that harmful substances arsenic and lead are easily contained in the children toothbrushes, the arsenic has strong toxicity, can cause cancer after being ingested in a small amount for a long time, is unfavorable for the development of the kidney of children, has great damage to the bodies of the children, and the lead can influence the functions of the nervous system, the cardiovascular system, the skeletal system, the reproductive system and the immune system of a human body to cause diseases of the gastrointestinal tract, the liver, the kidney and the brain. Aluminum, potassium, strontium, barium, manganese, cobalt, molybdenum and selenium can cause serious irreversible damage to human bodies. However, the detection method for arsenic, lead, aluminum, potassium, strontium, barium, manganese, cobalt, molybdenum and selenium of the existing children toothbrush in the market is complex, high in cost and incapable of rapid on-site detection, so that the market supervision department cannot detect and supervise the toothbrush in time. Even if the supervision and management department detects toothbrushes on the market, the materials of the toothbrushes and toothbrush heads are different during toothbrush detection, the toothbrushes cannot be ground separately, detected parts cannot be sampled separately for detection, and the detection result is inaccurate.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a device and a method for detecting harmful elements in a children toothbrush, and solves the problem that the harmful elements in the children toothbrush are difficult to detect.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

in order to achieve the purpose, the invention adopts the following technical scheme: a detection device for harmful elements in a child toothbrush comprises a sampling box, wherein a supporting plate is fixedly connected to the upper position of any one side of the sampling box, a first power box is fixedly connected to one side of the supporting plate, a feeding hole is formed in the upper position of one side of the sampling box, which is close to the first power box, a limiting sliding groove is formed in the lower surface of the top wall and the supporting plate in the sampling box, a first motor is fixedly connected to the inner wall of one side of the first power box, which is far away from the sampling box, a threaded rod is fixedly connected to the driving end of the first motor, one end of the threaded rod, which is far away from the first motor, is rotatably connected with the inner wall of the sampling box, a sliding block is in threaded connection with the outer wall of the threaded rod, two symmetrically arranged limiting pulleys are fixedly connected to the position, which is located below the limiting sliding groove, the slider lower surface is kept away from supporting shoe one side fixedly connected with second headstock, second headstock and supporting shoe are close to slider middle part position one side and rotate and be connected with the turning block, two be provided with the toothbrush head between the turning block, two the turning block is close to toothbrush head position and all runs through and be provided with and the through hole, two be provided with the bunch area between the turning block.

As a further description of the above technical solution:

and a motor is fixedly connected in the second power box, and the driving end of the motor is fixedly connected with the rotating block at the corresponding position.

As a further description of the above technical solution:

diapire middle part fixedly connected with support column in the sampling box, fixedly connected with material collecting block between support column middle part both sides position and the sampling box inner wall, just be located material collecting block below position fixedly connected with stopper between support column middle part both sides position and the sampling box inner wall, sampling box lateral wall position runs through and is provided with the drawer that gathers materials, the drawer bottom position that gathers materials and the stopper upper surface sliding connection who corresponds the position.

As a further description of the above technical solution:

the support frame that is located two symmetry settings of piece top fixedly connected with of gathering materials between support column middle part both sides position and the sampling box inner wall, two support frame upper surface central point puts fixedly connected with second motor.

As a further description of the above technical solution:

any one second motor driving end fixedly connected with of two in the second motor stirs the sword, two second motor driving end fixedly connected with who keeps away from the sword of stirring the bits beats mill.

As a further description of the above technical solution:

and a plurality of inclined plane grooves which are uniformly distributed are formed in the upper surface of the polishing disc.

The invention also aims to provide a method for detecting harmful elements in children's toothbrushes, which comprises the following steps:

s1, carrying out partition crushing on toothbrush bristles and toothbrush handle positions of a child toothbrush to obtain two crushed samples, namely, crushed powder of the toothbrush bristles and crushed powder of a toothbrush handle;

s2, sampling the powder crushed by the bristles in the step S1, putting the powder into two groups of test tubes, adding Zn powder into one group of test tubes, fully mixing and stirring the Zn powder and the toothbrush powder, grinding and sieving, wherein the sieving specification is 200 meshes, and the test tubes without the Zn powder are two groups of test tubes;

s3, pouring hydrochloric acid into the one group of test tubes and the two groups of test tubes of the powder sample crushed by the bristles in the S2, shaking and stirring, and stirring clockwise for 5-8 minutes;

s4, sleeving a group of stirred test tubes on the outer wall of a hot glass tube, and waiting for 20 minutes;

s5, scraping off black substances on the inner wall of the hot glass tube, and introducing the black substances into a clean test tube;

s6, adding sodium hypochlorite into the test tube in S5, slowly shaking the test tube, and observing whether the sediment in the test tube is dissolved, wherein arsenic is dissolved and arsenic is not dissolved;

s7, adding nitric acid and hydrogen peroxide into the two groups of test tubes in S3 for digestion, and injecting the digestion solution into an atomizer for mixing and stirring uniformly;

s8, subjecting the solution in the S7 to drying, ashing and atomization processes to enable the element lead to be detected to be dissociated into ground state atoms, enabling the ground state atoms to absorb characteristic spectral lines emitted by corresponding hollow cathode lamps to obtain corresponding absorbance, and determining the content of the lead according to the absorbance; the method comprises the following steps of heating by using a graphite furnace, and dividing the heating into a first drying stage, a second drying stage, an ashing stage, an atomization stage and a purification stage, wherein the temperatures are respectively 120 ℃, 140 ℃, 900 ℃, 1800 ℃ and 3000 ℃, and the duration time of each stage is respectively 20 seconds, 10 seconds, 5 seconds and 2 seconds; the lead element was measured by an atomic absorption spectrophotometer with a wavelength set to 283, an isoelectric current set to 10mA, a background correction was performed by Zeeman waves, and the type of signal was peak height.

S9, measuring aluminum, potassium, strontium, barium, manganese, cobalt, molybdenum and selenium in the powder crushed by the brush head by adopting an inductively coupled plasma atomic emission spectrometry, wherein the method comprises the following steps: adopting an ICP715-ES full-spectrum read-only inductively coupled plasma atomic emission spectrometer, processing the powder crushed by the brush head into 100mg/L of a solution to be measured of a sample, using a national standard solution for calibration to measure the solution to be measured of the sample, wherein all reagents are analytically pure, water is secondary deionized water, and then measuring is carried out according to the working conditions of an instrument, wherein the working conditions of the instrument comprise: a vertical rectangular tube, the power of a high-frequency generator is 1.00kW, the purity of argon is 99.999%, the flow rate of plasma is 15L/min, the flow rate of auxiliary gas is 1.5L/min, the pressure of an atomizer is 200kPa, the first reading time is 5s, the stabilization time is 15s, the observation height is 10mm, the rotating speed of a pump is 15r/min, the integration time is 30s, the cleaning time of a fast pump is 10s, the reading is 3 times, repeatedly measuring blank solution for 11 times according to optimized working conditions of the instrument, calculating a coarse standard deviation SD, according to IUPAC regulation, the detection limit LOD is 3SD, the mixed standard solution series of 8 elements is measured according to the optimized working conditions of the instrument, a two-point quantitative method is selected to complete the standard curve of aluminum, potassium, strontium, barium, manganese, cobalt, molybdenum and selenium, the content of the element in 8 was analyzed simultaneously by the measured value and the value of the relative standard deviation RSD measured for 8 elements.

S10. repeat steps S2-S9 for the brush handle crushed powder in S1.

Preferably, the sample digestion of S7 uses a lead standard solution, hydrogen peroxide, a 0.1% nitric acid solution and a 0.2% ammonium hydrogen phosphate solution provided by the national standard substance center, the sample is cooled to room temperature after digestion, the volume is determined with ultrapure water, the prepared lead standard solution is placed in an automatic sample injector, the lead standard solution is automatically diluted by an instrument, the set analysis is performed according to the working conditions of an atomic absorption spectrophotometer, the working curve of the standard solution is drawn, a linear equation is obtained, the digested sample and a blank solution are determined by a standard series determination condition method, and the lead content in the sample is determined according to the absorbance and the linear equation; the microwave digestion furnace is adopted for digestion and is divided into four stages, and the target temperatures of the four stages are respectively 160-170 ℃, 190-200 ℃, 120 ℃ and 100 ℃; the heating time is 1-3 minutes, 4-5 minutes, 1 minute and 0.5 minute respectively, and the heat preservation time is 10 minutes, 15 minutes, 12 minutes and 0 minute respectively.

The working principle is as follows: rotate thebolt 17 of screwing in solid fixedring 7 position with the toothbrush stopper for 16 support tight toothbrush of support piece, pulling slide bar 6 makes the toothbrush draw into crushingincasement 1 from open position, startssecond motor 14, makes crunchingsword 12 crutches up the toothbrush hair, and the toothbrush hair continues to remove in crushingincasement 1 after crunching up, makesabrasive disc 10 rotate with toothbrush handle crocus, collects the toothbrush handle crocus to the powder again.

(III) advantageous effects

The invention provides a device and a method for detecting harmful elements in a children toothbrush. The method has the following beneficial effects:

1. the detection means of the arsenic and lead substances is simple and convenient, the requirement on experimental environment is not high, and the detection medicine is a conventional medicine, so that the detection method is low in price.

2. The method for detecting aluminum, potassium, strontium, barium, manganese, cobalt, molybdenum and selenium is a quick and effective multi-element simultaneous detection method, and has the advantages of simple sample pretreatment, less interference, wide spectral line range, high sensitivity and good accuracy.

3. According to the invention, through the crushing device, the toothbrush is separately crushed through the crushing cutter and the grinding disc, so that the detection is convenient, the toothbrush bristles, the toothbrush head and the toothbrush handle can be detected, the arsenic content of different parts can be separately ground and detected, and the operation is simple.

Drawings

FIG. 1 is a schematic flow chart of a method for detecting harmful elements in a children's toothbrush according to an embodiment of the present invention;

FIG. 2 is a front view of a device for detecting harmful elements in a children's toothbrush according to the present invention;

FIG. 3 is a cross-sectional view of a device for detecting harmful elements in a children's toothbrush according to the present invention;

fig. 4 is an enlarged view of a point a in fig. 1.

Illustration of the drawings:

1. a sampling box; 2. a material collection drawer; 3. a threaded rod; 4. a support plate; 5. a slider; 6. a limiting pulley; 7. a first power box; 8. a first motor; 9. a limiting chute; 10. grinding disc; 11. a second motor; 12. a material collecting block; 13. a limiting block; 14. a support pillar; 15. a mincing knife; 16. a support frame; 17. a feed inlet; 18. a second power box; 19. a cable tie; 20. a toothbrush head; 21. a support block; 22. a through hole; 23. and (6) rotating the block.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 2-4, one embodiment provided by the present invention: a detection device for harmful elements in a child toothbrush comprises a sampling box 1, a supporting plate 4 is fixedly connected above any one side of the sampling box 1, a first power box 7 is fixedly connected on one side of the supporting plate 4 far away from the sampling box 1, a feeding hole 17 is formed in the upper position of one side of the sampling box 1 close to the first power box 7, limiting sliding grooves 9 are formed in the upper wall of the sampling box 1 and the lower surface of the supporting plate 4, a first motor 8 is fixedly connected to the inner wall of one side of the first power box 7 far away from the sampling box 1, a threaded rod 3 is fixedly connected to the driving end of the first motor 8, one end of the threaded rod 3 far away from the first motor 8 is rotatably connected with the inner wall of the sampling box 1, a sliding block 5 is in threaded connection with the outer wall of the threaded rod 3, two symmetrically arranged limiting pulleys 6 are fixedly connected to the upper surface of the, the lower surface of the slider 5 is close to one side of the first power box 7 and is slidably connected with a supporting block 21, the lower surface of the slider 5 is far away from one side of the supporting block 21 and is fixedly connected with a second power box 18, the second power box 18 and the supporting block 21 are close to one side of the middle position of the slider 5 and are rotatably connected with a rotating block 23, a toothbrush head 20 is arranged between the two rotating blocks 23, the two rotating blocks 23 are close to the toothbrush head 20 and are all arranged in a penetrating mode and are provided with through holes 22, a binding belt 19 is arranged between the two rotating blocks 23, and the toothbrush head 20 is clamped between the two rotating blocks 23 through.

A motor is fixedly connected in thesecond power box 18, and the driving end of the motor is fixedly connected with therotating block 23 at the corresponding position. Position fixedly connected withsupport column 14 in bottom wall middle part insampling box 1, fixedly connected withaggregate piece 12 between 14 middle part both sides positions of support column and the 1 inner wall of sampling box, 14 middle part both sides positions of support column and 1 inner wall of sampling box just are locatedaggregate piece 12 below position fixedly connected with

stopper

13, 1 lateral wall position of sampling box runs through and is provided withdrawer 2 that gathers materials, collect the material sampling of toothbrush hair andtoothbrush head 20 position throughdrawer 2 that gathers materials, 2 bottom positions of drawer that gathers materials and thestopper 13 upper surface sliding connection that corresponds the position,drawer 2 takes out the drawer that gathers materials conveniently.

Two support frames 16 which are symmetrically arranged are fixedly connected between the positions of two sides of the middle of eachsupport column 14 and the inner wall of thesampling box 1 and above thematerial collecting block 12, asecond motor 11 is fixedly connected to the center of the upper surface of eachsupport frame 16, and thesecond motor 11 provides power for the mincingknife 15 or thepolishing disc 10 in the corresponding position. Any onesecond motor 11 driving end of the twosecond motors 11 is fixedly connected with a mincingknife 15, and thesecond motor 11 driving end of the twosecond motors 11 far away from the mincingknife 15 is fixedly connected with apolishing disc 10. The upper surface position of thepolishing disc 10 is provided with a plurality of uniformly distributed inclined plane grooves, so that the powder of thetoothbrush head 20 which is polished down can be conveniently scratched into thecollecting drawer 2 at the corresponding position through the inclined plane grooves.

The working principle is as follows: two rotatingblocks 23 are fixed through abinding belt 19 by clamping atoothbrush head 20 between the tworotating blocks 23, thetoothbrush head 20 is clamped and fixed, afirst motor 8 is started, a slidingblock 5 moves under the action of a limiting slidinggroove 9 and a limiting pulley 6 to enter asampling box 1, asecond motor 11 is started, a mincingknife 15 and apolishing disc 10 rotate, the mincingknife 15 is used for mincing toothbrush hair, asecond power box 18 is rotated, the tworotating blocks 23 rotate, thetoothbrush head 20 is turned over, thepolishing disc 10 starts to polish at a position below one side of thetoothbrush head 20 far away from thefirst motor 8, the two collectingdrawers 2 are used for respectively collecting the toothbrush hair and the friction scraps of thetoothbrush head 20, and thetoothbrush head 20 can be separately sampled and detected.

Referring to fig. 1, the method for detecting harmful elements in children's toothbrushes by the apparatus for detecting harmful elements is characterized by comprising the steps of:

S9, measuring aluminum, potassium, strontium, barium, manganese, cobalt, molybdenum and selenium in the powder crushed by the brush head by adopting an inductively coupled plasma atomic emission spectrometry, wherein the method comprises the following steps: adopting an ICP715-ES full-spectrum read-only inductively coupled plasma atomic emission spectrometer, processing the powder crushed by the brush head into 100mg/L of a solution to be measured of a sample, using a national standard solution for calibration to measure the solution to be measured of the sample, wherein all reagents are analytically pure, water is secondary deionized water, and then measuring is carried out according to the working conditions of an instrument, wherein the working conditions of the instrument comprise: a vertical rectangular tube, a high-frequency generator power of 1.00kW, an argon gas purity of 99.999%, a plasma flow rate of 15L/min, an auxiliary gas flow rate of 1.5L/min, an atomizer pressure of 200kPa, a one-time reading time of 5s, a stabilization time of 15s, an observation height of 10mm, a pump rotation speed of 15r/min, an integration time of 30s, a fast pump cleaning time of 10s, and a reading of 3 times, wherein the blank solution is repeatedly measured 11 times according to optimized instrument operating conditions, a coarse standard deviation SD is calculated, and a detection limit LOD is 3SD according to IUPAC regulations, for the present example, detection limits of aluminum, potassium, strontium, barium, manganese, cobalt, molybdenum, and selenium are respectively 0.031, 0.002, 0.029, 0.019, 0.028, 0.017, 0.012, and 0.013mg/L, a mixed standard solution series of 8 elements is measured according to optimized instrument operating conditions, and a two-point quantitative method is selected to complete the series of aluminum, potassium, strontium, and the two-point quantitative method is completed, And (3) analyzing the content of 8 elements simultaneously by the measured values and the numerical values of the relative standard deviation RSD of the 8 elements according to the standard curves of the barium, the manganese, the cobalt, the molybdenum and the selenium.

S10. repeat steps S2-S9 for the brush handle crushed powder in S1.

The sample digestion of S7 uses lead standard solution, hydrogen peroxide, 0.1% nitric acid solution and 0.2% ammonium hydrogen phosphate solution provided by the national standard substance center, the sample is cooled to room temperature after digestion, the volume is fixed by ultrapure water, the prepared lead standard solution is placed into an automatic sample injector, the lead standard solution is automatically diluted by an instrument, the set analysis is carried out according to the working conditions of an atomic absorption spectrophotometer, the working curve of the standard solution is drawn to obtain a linear equation, the digested sample and a blank solution are determined by a method for determining standard series conditions, and the lead content in the sample is determined according to the absorbance and the linear equation; the microwave digestion furnace is adopted for digestion and is divided into four stages, and the target temperatures of the four stages are respectively 160-170 ℃, 190-200 ℃, 120 ℃ and 100 ℃; the heating time is 1-3 minutes, 4-5 minutes, 1 minute and 0.5 minute respectively, and the heat preservation time is 10 minutes, 15 minutes, 12 minutes and 0 minute respectively.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A detection device for harmful elements in a children's toothbrush, comprising a sampling box (1), characterized in that: the sampling box is characterized in that a supporting plate (4) is fixedly connected to the upper position of any one side of the sampling box (1), a first power box (7) is fixedly connected to one side, away from the sampling box (1), of the supporting plate (4), a feeding port (17) is formed in the position, close to the upper position of one side of the first power box (7), of the sampling box (1), limiting sliding grooves (9) are formed in the lower surfaces of the inner top wall of the sampling box (1) and the supporting plate (4), a first motor (8) is fixedly connected to the inner wall, away from the sampling box (1), of the first power box (7), a threaded rod (3) is fixedly connected to the driving end of the first motor (8), one end, away from the first motor (8), of the threaded rod (3) is rotatably connected with the inner wall of the sampling box (1), a sliding block (5) is connected to the outer wall of the threaded rod (3) in a penetrating manner, two symmetrically-, spacing pulley (6) and spacing spout (9) roll connection, slider (5) lower surface is close to first headstock (7) one side sliding connection and has supporting shoe (21), supporting shoe (21) one side fixedly connected with second headstock (18) are kept away from to slider (5) lower surface, second headstock (18) and supporting shoe (21) are close to slider (5) middle part position one side and rotate and are connected with turning block (23), two be provided with toothbrush head (20) between turning block (23), two turning block (23) are close to toothbrush head (20) position and all run through and are provided with and through hole (22), two be provided with between turning block (23) restraint line area (19).

2. The apparatus for detecting harmful elements in children's toothbrush according to claim 1, wherein: a motor is fixedly connected in the second power box (18), and the driving end of the motor is fixedly connected with a rotating block (23) at a corresponding position.

3. The apparatus for detecting harmful elements in children's toothbrush according to claim 1, wherein: wall middle part fixedly connected with support column (14) in sampling box (1), fixedly connected with aggregate piece (12) between support column (14) middle part both sides position and the sampling box (1) inner wall, just be located aggregate piece (12) below position fixedly connected with stopper (13) between support column (14) middle part both sides position and sampling box (1) inner wall, sampling box (1) lateral wall position runs through and is provided with drawer (2) that gathers materials, drawer (2) bottom position and the stopper (13) upper surface sliding connection who corresponds the position of gathering materials.

4. A device for detecting harmful elements in a children's toothbrush according to claim 3, wherein: the sampling box is characterized in that two support frames (16) which are symmetrically arranged and fixedly connected with the upper part of the material collecting block (12) are arranged between the two sides of the middle part of the support column (14) and the inner wall of the sampling box (1), and a second motor (11) is fixedly connected with the center of the upper surface of each support frame (16).

5. The device for detecting harmful elements in children's toothbrush according to claim 4, wherein: any one second motor (11) driving end of the two second motors (11) is fixedly connected with a mincing knife (15), and the driving end of the second motor (11) far away from the mincing knife (15) of the two second motors (11) is fixedly connected with a polishing disc (10).

6. The device for detecting harmful elements in children's toothbrush according to claim 5, wherein: the upper surface of the polishing disc (10) is provided with a plurality of uniformly distributed inclined plane grooves.

7. A method of detecting harmful elements in a children's toothbrush using a device for detecting harmful elements according to any one of claims 1 to 6, comprising the steps of:

s8, subjecting the solution in the S7 to drying, ashing and atomization processes to enable the element lead to be detected to be dissociated into ground state atoms, enabling the ground state atoms to absorb characteristic spectral lines emitted by corresponding hollow cathode lamps to obtain corresponding absorbance, and determining the content of the lead according to the absorbance; the method comprises the following steps of heating by using a graphite furnace, and dividing the heating into a first drying stage, a second drying stage, an ashing stage, an atomization stage and a purification stage, wherein the temperatures are respectively 120 ℃, 140 ℃, 900 ℃, 1800 ℃ and 3000 ℃, and the duration time of each stage is respectively 20 seconds, 10 seconds, 5 seconds and 2 seconds; measuring lead element by adopting an atomic absorption spectrophotometer, setting the wavelength to be 283, setting the isoelectric current to be 10mA, adopting Zeeman waves to correct the background, and adopting the peak height as the type of a signal;

s9, measuring aluminum, potassium, strontium, barium, manganese, cobalt, molybdenum and selenium in the powder crushed by the brush head by adopting an inductively coupled plasma atomic emission spectrometry, wherein the method comprises the following steps: adopting an ICP715-ES full-spectrum read-only inductively coupled plasma atomic emission spectrometer, processing the powder crushed by the brush head into 100mg/L of a solution to be measured of a sample, using a national standard solution for calibration to measure the solution to be measured of the sample, wherein all reagents are analytically pure, water is secondary deionized water, and then measuring is carried out according to the working conditions of an instrument, wherein the working conditions of the instrument comprise: a vertical rectangular tube, a high-frequency generator power of 1.00kW, an argon gas purity of 99.999%, a plasma flow rate of 15L/min, an auxiliary gas flow rate of 1.5L/min, an atomizer pressure of 200kPa, a one-time reading time of 5s, a stabilization time of 15s, an observation height of 10mm, a pump rotation speed of 15r/min, an integration time of 30s, a fast pump cleaning time of 10s, and a reading of 3 times, wherein the blank solution is repeatedly measured 11 times according to optimized instrument operating conditions, a coarse standard deviation SD is calculated, and a detection limit LOD is 3SD according to IUPAC regulations, for the present example, detection limits of aluminum, potassium, strontium, barium, manganese, cobalt, molybdenum, and selenium are respectively 0.031, 0.002, 0.029, 0.019, 0.028, 0.017, 0.012, and 0.013mg/L, a mixed standard solution series of 8 elements is measured according to optimized instrument operating conditions, and a two-point quantitative method is selected to complete the series of aluminum, potassium, strontium, and the two-point quantitative method is completed, The standard curve of barium, manganese, cobalt, molybdenum and selenium, and the content of the element in 8 is analyzed simultaneously through the measured value and the numerical value of the relative standard deviation RSD measured by 8 elements;

s10. repeat steps S2-S9 for the brush handle crushed powder in S1.

8. The method for detecting harmful elements in children's toothbrush according to claim 7, wherein: the sample digestion of S7 uses lead standard solution, hydrogen peroxide, 0.1% nitric acid solution and 0.2% ammonium hydrogen phosphate solution provided by the national standard substance center, the sample is cooled to room temperature after digestion, the volume is fixed by ultrapure water, the prepared lead standard use solution is placed into an automatic sample injector, the lead standard use solution is automatically diluted by an instrument, the set analysis is carried out according to the working conditions of an atomic absorption spectrophotometer, the working curve of the standard solution is drawn to obtain a linear equation, the digested sample and a blank solution are determined by a method for determining standard series conditions, and the lead content in the sample is determined according to the absorbance and the linear equation; the microwave digestion furnace is adopted for digestion and is divided into four stages, and the target temperatures of the four stages are respectively 160-170 ℃, 190-200 ℃, 120 ℃ and 100 ℃; the heating time is 1-3 minutes, 4-5 minutes, 1 minute and 0.5 minute respectively, and the heat preservation time is 10 minutes, 15 minutes, 12 minutes and 0 minute respectively.