CN101756078A - Method for removing arsenic in Porphyra haitanensis - Google Patents

Abstract

The invention discloses a method for removing arsenic in Porphyra haitanensis. Fresh Porphyra haitanensis and deionized water are put into a container by weight-to-volume ratio of 4.5-5.5:25. The container is moved into an ultrasonic extractor. Ultrasonic treatment is conducted to the Porphyra haitanensis in the container under ultrasonic temperature of 25-45 DEG C and ultrasonic frequency of 25 KHz in a way that ultrasonic waves are emitted for 0.3-0.6 seconds at intervals of 0.7-0.4 seconds. The total time of the ultrasonic treatment is 10-25 minutes. Through the ultrasonic treatment under the conditions and in the way, the removal rate of the arsenic in Porphyra haitanensis can reach more than 60 percent, the residual arsenic in Porphyra haitanensis is lower than the value required by the national standard, and the harmfulness to the bodies of people, especially the bodies of children, is reduced. The method has the advantages that no pollution is caused to Porphyra haitanensis, the impact on the quality of Porphyra haitanensis is small, the removal time is short, the speed is fast and the removal rate is high.

Description

The removal methods of arsenic in a kind of porphyra haitanensis

Technical field

The present invention relates to the heavy metal removing technology in the food, be specifically related to the removal methods of arsenic in a kind of porphyra haitanensis.

Background technology

Porphyra haitanensis (Porphyra haitanensis) belongs to the former Rhodophyceae of Rhodophyta (Rhodophyta) (Protoflorideophyceae) Bangiales section (Bangiaceae) Porphyra (Porphyra) algae, is one of two main kinds of China artificial cultivation laver.Porphyra haitanensis has important edible and economic worth, also is China's Coastal Areas main exit characteristic agricultural product.But along with developing rapidly of adjacent harbor work's agricultural production, the coastal ocean environmental pollution is serious day by day, the content overproof problem that causes exporting heavy metal element in the marine product (as chromium, cadmium, lead and arsenic etc.) occurs again and again, influence especially children healthy of people, also restricted the outlet of jar laver product.Therefore set up pollution-free, quick, removal efficiency preferably in the porphyra haitanensis removal methods of heavy metal element seem particularly important.

Remove Study on Technology with regard to heavy metal element in food and the bulk drug at present, domestic scholars is primarily aimed in the Chinese herbal product heavy metal removing technology and has carried out research.(South China Science ﹠ Engineering University's journal, 2005,33 (6): 59～62) having studied with the sodium diethyldithiocarbamate is compounding ingredient, supercritical CO as Dang Zhi etc.₂Extraction reduces the method for the contents of heavy metal elements in the Pogostemon cablin.Good earlier (Chinese patent drug, 2005,27 (12): 1376～1379) discover that the heavy metal element that exceeds standard that macroporous chelate resin D401 and D402 can be used in the Chinese medicine crude extract removes of waiting of king.(Chinese patent drug, 2001,23 (4): 243～245) studied the flocculate with chitosan fining agent and be used for removing zinc, manganese, calcium and the lead content made from extra care Chinese traditional medicine water extract such as Zhang Tong.

Summary of the invention

Technical problem to be solved by this invention provides a kind of pollution-free, quick, removal efficiency removal methods of arsenic in the porphyra haitanensis preferably.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: the removal methods of arsenic in a kind of porphyra haitanensis, volume ratio 4.5～5.5 by weight: 25 ratio, bright porphyra haitanensis and deionized water are put into container, described container is moved in the ultrasonic wave extraction apparatus, in ultrasonic temperature is 25～45 ℃, supersonic frequency is under the condition of 25KHz, with ultrasonic 0.3～0.6 second, rest the interval ultrasonic power of 0.7～0.4 second (being that pulse duty factor is 0.3～0.6), porphyra haitanensis in the container is carried out ultrasonic processing, and ultrasonic total time is 10～25 minutes; The ultrasonic wave extraction apparatus is available from the new sesame bio-instruments in Ningbo limited company, and model is SB1200T, and frequency specification is 25KHz/45KHz.

Ultrasonic power is ultrasonic 0.5 second at interval, rests 0.5 second; Ultrasonic power is better to the removal effect of arsenic at interval for this.

Ultrasonic temperature is 35 ℃, and ultrasonic total time is 10 minutes, under this ultrasonic temperature and the ultrasonic total time condition, operative temperature is lower, and ultrasonic time is few, and is few to the influence of porphyra haitanensis composition, and the removal efficiency of inorganic arsenic is still higher, reach more than 68%, and be selection more excellent when removing inorganic arsenic therefore.

Ultrasonic temperature is 45 ℃, and ultrasonic total time is 20 minutes, under this ultrasonic temperature and the ultrasonic total time condition, operative temperature is not high yet, and ultrasonic time is also less, and is less to the influence of porphyra haitanensis composition yet, and the removal efficiency of total arsenic is higher, reaches more than 90%, therefore is selection more excellent when removing total arsenic.

Compared with prior art, the invention has the advantages that the removal methods of arsenic in a kind of porphyra haitanensis, volume ratio 4.5～5.5 by weight: 25 ratio, bright porphyra haitanensis and deionized water are put into container, and container is moved in the ultrasonic wave extraction apparatus, in ultrasonic temperature is 25～45 ℃, supersonic frequency is under the condition of 25KHz, with ultrasonic 0.3～0.6 second, rests 0.7～0.4 second interval ultrasonic power, porphyra haitanensis in the container is carried out ultrasonic processing, and ultrasonic total time is 10～25 minutes; Like this after the ultrasonic processing of above-mentioned condition and mode, the removal efficiency of arsenic can reach more than 60% in the porphyra haitanensis, make the residual quantity of arsenic in the porphyra haitanensis be lower than national standard algae goods sanitary standard or food in the pollutant requirement of limiting the quantity of, reduced of the harm of edible back to people especially children's torso, this method does not pollute porphyra haitanensis, the quality of porphyra haitanensis is also influenced seldom, and remove time less, speed is fast, and removal efficiency is higher.Therefore the present invention is a kind of pollution-free, quick, removal efficiency removal methods of arsenic in the porphyra haitanensis preferably.

The specific embodiment

Below in conjunction with embodiment the present invention is described in further detail.

Embodiment 1

The bright porphyra haitanensis of 5 grams is put into conical flask, add 25 ml deionized water, conical flask is moved in the ultrasonic wave extraction apparatus then, in ultrasonic temperature was 35 ℃, and supersonic frequency is under the condition of 25KHz, with ultrasonic 0.5 second, rest 0.5 second interval ultrasonic power, porphyra haitanensis in the container is carried out ultrasonic processing, and ultrasonic total time is 10 minutes, obtains removal effect dearsenification porphyra haitanensis preferably; Also can remove simultaneously other heavy metal of part, as chromium, cadmium and lead etc.Ultrasonic temperature also can be 30 ℃ or 25 ℃ etc. among this embodiment, and ultrasonic total time also can be 15 minutes etc.

Embodiment 2

Substantially the same manner as Example 1, different is, and ultrasonic temperature is 45 ℃, and ultrasonic total time is 20 minutes.Ultrasonic total time also can be 25 minutes etc. among this embodiment.

In the foregoing description, ultrasonic power also can be ultrasonic 0.3 second at interval, rests 0.7 second, or is ultrasonic 0.6 second, rests 0.4 second etc.

Test example

Bright porphyra haitanensis and embodiment 1 and embodiment 2 dearsenification porphyra haitanensis are handled with following method respectively detect: accurate weighing 0.2g, put into digester after the drying, add 6ml 65%HNO in the digester₃With 2ml 30%H₂O₂, leave standstill digestion 3-4h.Digester moves into the microwave digestion instrument, power setting 1200W, 100 ℃ of temperature, digestion 10min; Adjusting power is to 1500W, and 180 ℃ of temperature digest 10min; Adjusting power is to 650W, and 100 ℃ of temperature digest 10min, colourless, the clarification of digestive juice.The digester cooling, digestive juice and rinse liquid are transferred to the 25ml volumetric flask, and high purity water is settled to 25ml, and the ICP-OES method is measured arsenic content.Measurement result: bright porphyra haitanensis total arsenic content is 10.9752/mgkg^-1, inorganic arsenic content is 3.2109/mgkg^-1, embodiment 1 dearsenification porphyra haitanensis inorganic arsenic content is 1.0023/mgkg^-1, being lower than 1.5 standards of GB, removal efficiency is 68.8%, embodiment 2 dearsenification porphyra haitanensis total arsenic contents are 1.0137/mgkg^-1, removal efficiency is 90.8%.

Above-mentioned microwave digestion instrument is available from U.S. CE M company, and inductively coupled plasma optical emission spectroscopy (ICP-OES) is available from U.S. Perkin Elemer company.

Above-mentioned bright porphyra haitanensis picks up from Jiangsu.

Claims (4)

1. the removal methods of arsenic in the porphyra haitanensis, it is characterized in that the ratio of volume ratio 4.5～5.5: 25 by weight, bright porphyra haitanensis and deionized water are put into container, described container is moved in the ultrasonic wave extraction apparatus, is 25～45 ℃ in ultrasonic temperature, and supersonic frequency is under the condition of 25KHz, with ultrasonic 0.3～0.6 second, rest 0.7～0.4 second interval ultrasonic power, the porphyra haitanensis in the container is carried out ultrasonic processing, ultrasonic total time is 10～25 minutes.

2. the removal methods of arsenic in a kind of porphyra haitanensis as claimed in claim 1 is characterized in that ultrasonic power is ultrasonic 0.5 second at interval, rests 0.5 second.

3. the removal methods of arsenic in a kind of porphyra haitanensis as claimed in claim 1 is characterized in that ultrasonic temperature is 35 ℃, and ultrasonic total time is 10 minutes.

4. the removal methods of arsenic in a kind of porphyra haitanensis as claimed in claim 1 is characterized in that ultrasonic temperature is 45 ℃, and ultrasonic total time is 20 minutes.