Method and device for extracting mercury forms in grain and application thereof

An extraction device and extraction method technology, applied in the field of chemical separation, can solve the problems of long pretreatment time, human and environmental hazards, and inability to detect mercury forms, so as to shorten the extraction time, reduce the extraction time, and avoid the damage of mercury elements. Effect

Pending Publication Date: 2019-11-05
ACAD OF NAT FOOD & STRATEGIC RESERVES ADMINISTRATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pretreatment time of this method is still long, depending on the element, the longest extraction time is 30 minutes, preferably 10 to 15 minutes, and the sample liquid obt

Method used

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  • Method and device for extracting mercury forms in grain and application thereof
  • Method and device for extracting mercury forms in grain and application thereof
  • Method and device for extracting mercury forms in grain and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Example 1 Extraction device for rapid extraction of mercury forms in grains

[0059] Such as figure 1 As shown, the extraction device for quickly extracting the form of mercury in grains of the present invention includes a drive unit 1, an ultrasonic unit 2, an electric control unit 3 and a display unit 4, the drive unit 1 is connected to the ultrasonic unit 2 through a belt 5, and the drive unit 1 , the ultrasonic unit 2, and the display unit 4 are respectively connected to the electric control unit 3;

[0060] The drive unit 1 includes a drive shaft 11 and a motor 12, the drive shaft 11 is directly connected to the motor 12, and the motor 12 is powered by a battery 8;

[0061] The ultrasonic unit 2 includes an ultrasonic head 21 and a sample container centrifuge tube 22. The ultrasonic head 21 includes six ultrasonic horns 211, which are respectively placed corresponding to the six sample containers 22, and the sample containers 22 are placed on the container holder ...

Embodiment 2

[0064] Embodiment 2 detects the mercury form in the sample

[0065] Adopt liquid chromatography-atomic fluorescence spectrometry to detect inorganic mercury and methylmercury in the liquid to be tested obtained in Example 1, and set a control group, specifically as follows:

[0066] The control group weighed 0.5g of the same brown rice sample as in Example 1, extracted according to the pretreatment method specified in GB5009.17-2014 "National Food Safety Standard Food Determination of Total Mercury and Organic Mercury", and added 5mL of 5mol / L hydrochloric acid, left overnight; Ultrasonic water bath extraction at room temperature for 60min, shaking several times during the period; 5. Add 0.1mL of 10 g / L L-cysteine ​​solution, and finally dilute to 5mL with ultrapure water; filter through a 0.45μm organic filter membrane before testing.

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Abstract

The invention provides a method and device for extracting mercury forms in grain and application thereof. The method comprises the following steps that a grain sample and an L-cysteine solution are uniformly mixed, the mercury forms are extracted after ultrasonic crushing, insoluble substances are removed, and supernatant is taken fir measurement. The method for extracting the mercury forms in thegrain is rapid, simple and convenient, and an extracting solution can be used for simultaneously measuring total mercury, inorganic mercury, methyl mercury and other mercury forms; a sample does notneed to be soaked overnight, no acid-base solvent is used, heating digestion before machine detection or adjustment of the pH value of the extracting solution is not needed, the extracting solution isL-cysteine and has no harm to the human body and environment, the mercury forms in the sample can be extracted by utilizing ultrasonic crushing for 5 minutes, and the extraction rate can reach 95% orabove.

Description

technical field [0001] The invention relates to the field of chemical separation, and relates to an extraction method, an extraction device and an application of mercury forms in grains. Background technique [0002] Grain mainly includes rice, wheat, corn and beans, etc. Grain and its products are the most basic dietary composition of human beings, which contain not only magnesium, potassium and calcium and other indispensable mineral nutrients for human body, but also lead, cadmium and mercury and other heavy metal elements harmful to human body. Among them, the common natural forms of mercury include inorganic mercury and organic mercury (methylmercury, ethylmercury and phenylmercury). Methylmercury is one of the most toxic mercury compounds. It is lipophilic and can pass through the food chain. The concentrated effect enters the human body and seriously threatens human health. Therefore, a comprehensive analysis of the content, form and distribution of mineral elements...

Claims

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Application Information

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IPC IPC(8): G01N1/28
CPCG01N1/28
Inventor 周明慧王松雪陈曦伍燕湘田巍张洁琼张炜
Owner ACAD OF NAT FOOD & STRATEGIC RESERVES ADMINISTRATION
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