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Method for measuring inorganic arsenic content of rice flour and digesting-centrifuging device

A technology of inorganic arsenic and rice flour, applied in measuring devices, material separation, instruments, etc., can solve the problems of inorganic arsenic being toxic, threatening the health of operators, scalding operators, etc., achieving complete functions, novel structure, saving work and effect of time

Active Publication Date: 2018-06-05
江苏中宜金大分析检测有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the determination method for measuring the content of inorganic arsenic in agricultural products is operated step by step by the operator. First, the rice flour is pretreated, which requires personnel to perform operations such as digestion and shaking, and operations are also required during centrifugation and monitoring. Inorganic arsenic is often toxic, and long-term contact with operators will pose a threat to the health of operators. Digestion generally requires heating, and shaking the heated centrifuge tube by hand may cause burns to the operator.

Method used

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  • Method for measuring inorganic arsenic content of rice flour and digesting-centrifuging device
  • Method for measuring inorganic arsenic content of rice flour and digesting-centrifuging device
  • Method for measuring inorganic arsenic content of rice flour and digesting-centrifuging device

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Effect test

Embodiment 1

[0040] Such as figure 2 Shown, a kind of method for measuring inorganic arsenic content in rice flour mainly comprises the following steps:

[0041] (1) Inorganic arsenic extraction:

[0042] a. Take GBW (E) 100349, GBW (E) 100352, and GBW (E) 100361 three kinds of standard materials for rice composition analysis, and make three parallel groups for each type of rice, and use a dryer to dry each group of rice at a temperature of 70°C Dry for 1.5 hours, then use a grinder to grind, weigh 1g of rice flour after passing through a 100-mesh sieve, add them to 50ml centrifuge tubes, add ultrapure water to 5ml, close the centrifuge tube cover and place it in the digestion centrifuge In the test tube tank 21, use the shaking device 6 to shake the centrifuge tube for 30 seconds, and then let it stand for 5 minutes;

[0043] b. Open the centrifuge tube cover and add a sodium hydroxide solution with a concentration of 0.1mol / L to the centrifuge tube, adjust the pH of the solution in th...

Embodiment 2

[0057] Such as figure 2 Shown, a kind of method for measuring inorganic arsenic content in rice flour mainly comprises the following steps:

[0058] (1) Inorganic arsenic extraction:

[0059] a. Take GBW (E) 100349, GBW (E) 100352, and GBW (E) 100361 three kinds of standard materials for rice composition analysis, and make three parallel groups for each type of rice, and use a dryer to dry each group of rice at a temperature of 70°C Dry for 1.5 hours, then use a grinder to grind, weigh 1g of rice flour after passing through a 100-mesh sieve, add them to 50ml centrifuge tubes, add ultrapure water to 5ml, close the centrifuge tube cover and place it in the digestion centrifuge In the test tube tank 21, use the shaking device 6 to shake the centrifuge tube for 30 seconds, and then let it stand for 5 minutes;

[0060] b. Open the centrifuge tube cover and add sodium hydroxide solution with a concentration of 0.1mol / L to the centrifuge tube, adjust the pH of the solution in the ...

Embodiment 3

[0074] Such as figure 2 Shown, a kind of method for measuring inorganic arsenic content in rice flour mainly comprises the following steps:

[0075] (1) Inorganic arsenic extraction:

[0076] a. Take GBW (E) 100349, GBW (E) 100352, and GBW (E) 100361 three kinds of standard materials for rice composition analysis, and make three parallel groups for each type of rice, and use a dryer to dry each group of rice at a temperature of 70°C Dry for 1.5 hours, then use a grinder to grind, weigh 1g of rice flour after passing through a 100-mesh sieve, add them to 50ml centrifuge tubes, add ultrapure water to 5ml, close the centrifuge tube cover and place it in the digestion centrifuge In the test tube tank 21, use the shaking device 6 to shake the centrifuge tube for 30 seconds, and then let it stand for 5 minutes;

[0077] b. Open the centrifuge tube cover and add a sodium hydroxide solution with a concentration of 0.1mol / L to the centrifuge tube, adjust the pH of the solution in th...

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Abstract

The invention discloses a method for measuring inorganic arsenic content of rice flour and a digesting-centrifuging device. The method mainly comprises the following steps: 1) extraction of inorganicarsenic; 2) filtering of an extracting solution; 3) detection with a liquid chromatography-inductively coupled plasma mass spectrometer; 4) result analysis: calculating the inorganic arsenic content shown in the description of the rice flour according to the weighed rice flour weight and detected concentration of the extracting solution. By adopting the digesting-centrifuging device, automatic digestion by means of swinging and heating can be realized, centrifuging operation can be performed directly after digestion, the workload of an operator is lowered greatly through the automatic digestion by means of swinging and heating, the digesting time is shortened greatly, and meanwhile the trouble in frequently replacing an instrument is avoided. By adopting the detection method disclosed by the invention, the difficulty in preparing a moving phase is lowered, the salt content of the moving phase is lowered, the instrument is protected better, and the detection limit, sensitivity and measurement linear range are not influenced.

Description

technical field [0001] The invention relates to the technical field of detection of heavy metals in agricultural products, in particular to a method for measuring the content of inorganic arsenic in rice flour and a digestion and centrifugation device. Background technique [0002] In the environment and ecosystem, arsenic has many forms, among which inorganic arsenic is carcinogenic to human body. Exposure to inorganic arsenic often causes melanosis, skin keratinization, and canceration of some organs such as skin, kidney, lung, and liver. Although the determination of the total amount of arsenic is very important, due to the different forms of arsenic, the toxicity is different, so the analysis of arsenic form is of great significance for the accurate assessment of environmental pollution and human health risks. [0003] There are many methods for the determination of arsenic species, among which liquid chromatography-inductively coupled plasma mass spectrometry is the mo...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
CPCG01N30/02G01N30/06G01N2030/027
Inventor 曾超白洪超周季堂朱云迪
Owner 江苏中宜金大分析检测有限公司
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