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Pretreatment method and detecting method for detecting total arsenic content of milk beverage

A milk beverage and content technology, which is used in the preparation of test samples, material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of long detection time, sample contamination, and no total arsenic content detection, and achieves simple, fast, and difficult operation. The effect of pollution

Inactive Publication Date: 2013-04-03
INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sample pretreatment methods of these methods are cumbersome, which can easily cause the loss of arsenic and sample contamination, and the detection time is long, which easily affects the detection effect
At present, there is no pretreatment method and rapid and accurate detection method for the detection of total arsenic content in milk beverages.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0018] The first embodiment: a pretreatment method for detecting the total arsenic content of milk beverage.

[0019] 1. Solution and sample to be tested.

[0020] 50g / L thiourea solution: Dissolve 5g of thiourea in water, dilute with water to 100mL and mix well.

[0021] The sample to be tested is a milk drink.

[0022] 2. Operation steps.

[0023] Take 2g of the sample to be tested, add 2mL of glacial acetic acid, add water to make up to 50mL and mix evenly, after standing for 10 minutes, the precipitation is complete, filter to remove the precipitate, and obtain the filtrate; add 1mL of 50g / L thiourea solution and 0.5 mL of 36% hydrochloric acid (commercially available), and mix well to obtain the test solution.

no. 2 example

[0024] The second embodiment: another pretreatment method for detecting the total arsenic content of milk beverage.

[0025] 1. Solution and sample to be tested.

[0026] 50g / L thiourea solution: Dissolve 5g of thiourea in water, dilute with water to 100mL and mix well.

[0027] The sample to be tested is a milk drink.

[0028] 2. Operation steps.

[0029] Take 2g of the sample to be tested, add 10mL of 0.1% trichloroacetic acid solution and 1mL of 2% lead acetate solution, add water to make up to 50mL and mix well, let it stand for 10 minutes and then the precipitation is complete, filter to remove the precipitate, and obtain the filtrate; Add 1mL of 50g / L thiourea solution and 0.5mL of 36% hydrochloric acid (commercially available) to each 10mL of filtrate, mix well to obtain the test solution.

no. 3 example

[0030] The third embodiment: a method for detecting the total arsenic content of a milk drink.

[0031] 1. Solution and sample to be tested.

[0032] 15g / L potassium borohydride solution: Weigh 15g of potassium borohydride, dissolve in 1000mL of 3g / L potassium hydroxide solution, and mix well.

[0033] 0.1 μg / L arsenic standard intermediate solution: Dilute 1000 μg / L arsenic standard stock solution (purchased from the National Center for Standard Materials) 10,000 times with ultrapure water to prepare 0.1 μg / L arsenic standard intermediate solution.

[0034] Arsenic series standard solution: add 0.1μg / L arsenic standard intermediate solution 2.5mL, 2.0mL, 1.5mL, 1.0mL, 0.5mL and 0mL respectively into six 25mL volumetric flasks, rinse the mouth of the bottle with ultrapure water, and then Add 2.5mL of 50g / L thiourea solution and 1.25mL of 36% hydrochloric acid (commercially available) respectively, and finally dilute to the mark with ultrapure water and mix well to make arseni...

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Abstract

The invention relates to a pretreatment method for detecting the total arsenic content of a milk beverage. The pretreatment method comprises the following steps of: taking the milk beverage; adding protein precipitator and water; filtering after precipitating completely; adding a thiourea solution and 36 percent by mass of muriatic acid into the filtrate so as to obtain the liquid to be detected. The invention also provides a detecting method using the pretreatment method. The detecting method comprises the following steps that: the milk beverage is made into the liquid to be detected by using the pretreatment method; super pure water is made into blank liquid to be detected also by using the pretreatment method; the liquid to be detected and the blank liquid to be detected are detected by using an atomic fluorophotometer; and the total arsenic content in the liquid is obtained by using an external standard method, so as to calculate and obtain the total arsenic content of the milk beverage. According to the method provided by the invention, substances such as protein and fat in the milk beverage are eliminated through the pretreatment method, the five arsenic in the sample is converted into three arsenic, the total arsenic content in the liquid to be detected is detected by using the atomic fluorophotometer, and the total arsenic content of the milk beverage is obtained through calculation. The detecting method is simple and rapid to operate, and the total arsenic content of the milk beverage can be effectively detected.

Description

technical field [0001] The invention relates to a pretreatment method for detecting the total arsenic content in food, and is especially suitable for detecting the total arsenic content in milk beverages. The invention also provides a detection method using the pretreatment method. Background technique [0002] Arsenic is a heavy metal element that is harmful to the human body. Its oxides and arsenate have varying degrees of damage to the human heart muscle and respiratory, nervous, reproductive, hematopoietic, and immune systems. In this regard, the country has formulated food hygiene standards and stipulated the limit standards for total arsenic in milk beverages. However, since arsenic is a volatile metalloid element, it is difficult to determine it in the actual detection process. [0003] Existing detection methods for the total arsenic content of milk beverages mainly include hydride atomic fluorescence spectrometry, silver salt method, and arsenic spot method mention...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/34G01N21/64
Inventor 乌尼尔其其格高娃满都呼常建军李梅刘卫星
Owner INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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