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Method for extracting inorganic arsenic in rice

An inorganic arsenic and rice technology, applied in the preparation of test samples, fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of low extraction rate, long extraction time, inconsistent methods, etc., and achieve high extraction efficiency and extraction time. short effect

Inactive Publication Date: 2014-01-29
常熟市梅李镇香园稻米专业合作社
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  • Summary
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  • Description
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  • Application Information

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Problems solved by technology

However, there is currently no specific detection method for the content of inorganic arsenic in rice in my country. The detection method for the content of inorganic arsenic in food used in the detection of rice has disadvantages such as lack of pertinence, inconsistent methods, long extraction time, and low extraction rate.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Prepare a standard solution of Ⅲ-As with a concentration of 15.00 μg / L: pipette 7.5×10 -4 Put 1000mg / L III-As standard solution in a 50mL volumetric flask, and dilute to the mark with ultrapure water.

[0023] (2) Preparation of sample extract: Accurately weigh 1.0000g of rice sample and 20mL of 0.5mol / L hydrochloric acid solution and place them in a closed microwave digestion apparatus. Set the target temperature of the digestion apparatus to 50°C, the heating time is 8min, and after 20min of digestion, Let the obtained digestion solution stand still, extract 4mL supernatant into a 10mL centrifuge tube, then add 1mL L-hemisaccharine with a volume fraction of 2% to the tube, mix well, and centrifuge at a speed of 15,000 rpm for 5 After 10 minutes, stand still and separate the liquid to obtain the rice sample extract; simultaneously make a reagent blank solution.

[0024] (3) Drawing of standard working curve and determination of samples: Inject 15.00 μg / L Ⅲ-As stan...

Embodiment 2

[0026] (1) Prepare a standard solution of Ⅲ-As with a concentration of 15.00 μg / L: pipette 7.5×10 -4 Put 1000mg / L III-As standard solution in a 50mL volumetric flask, and dilute to the mark with ultrapure water.

[0027] (2) Preparation of sample extract: Accurately weigh 1.0000g of rice sample and 25mL of 0.5mol / L hydrochloric acid solution and place it in a closed microwave digestion apparatus. Set the target temperature of the digestion apparatus to 60°C, the heating time is 8min, and after 20min of digestion, Let the obtained digestion solution stand still, extract 4mL supernatant into a 10mL centrifuge tube, then add 1mL L-hemisaccharine with a volume fraction of 2% to the tube, mix well, and centrifuge at a speed of 15,000 rpm for 5 After 10 minutes, stand still and separate the liquid to obtain the rice sample extract; simultaneously make a reagent blank solution.

[0028] (3) Drawing of standard working curve and determination of samples: Inject 15.00 μg / L Ⅲ-As standa...

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Abstract

The invention discloses a method for extracting inorganic arsenic in rice. The method comprises the following specific steps: (1) preparing an III-As standard solution; (2) preparing a sample extraction solution, namely placing a rice sample and a hydrochloric acid solution according to a certain solid-to-liquid ratio in a closed microwave digestion instrument, setting a working parameter of the digestion instrument, standing an obtained digestion solution, extracting a supernatant liquor, adding a pre-reducer into the supernatant liquor and mixing evenly, centrifuging for 5 minutes at a speed of 15,000 rpm (revolutions per minute), and then standing and separating solution, thus obtaining the rice sample extraction solution; preparing a reagent blank solution synchronously; and (3) drawing a standard work curve and detecting the content of the inorganic arsenic in the sample solution. According to the method, the recovery rate of the III-As is 92-98%, the degree of precision is 2.5%, and the detection limit of the inorganic arsenic is 0.085 microgram / liter. The method, disclosed by the invention, has the advantages of short extraction time and high extraction efficiency, and is capable of accurately detecting the content of the inorganic arsenic in the rice.

Description

technical field [0001] The invention relates to the technical field of extraction and detection of toxic substances in rice, in particular to a method for extracting inorganic arsenic in rice. Background technique [0002] In recent years, due to the serious pollution of the environment and the anaerobic living environment of rice flooding, the content of inorganic arsenic in rice exceeds the standard, which is harmful to human health. Therefore, it is necessary to accurately and effectively detect the content of inorganic arsenic in rice in order to take corresponding measures. control measures. However, there is currently no specific detection method for the content of inorganic arsenic in rice in my country, and the detection method for the content of inorganic arsenic in food used in the detection of rice has disadvantages such as lack of pertinence, inconsistent methods, long extraction time, and low extraction rate. . Contents of the invention [0003] The technical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/34G01N1/44G01N21/64
Inventor 赵建东
Owner 常熟市梅李镇香园稻米专业合作社
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