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Pretreatment method for determination of content of cadmium metal in rice

A cadmium metal and rice technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problem of cadmium element peak position deviation, etc., achieve obvious effect, convenient and easy test method

Inactive Publication Date: 2017-04-26
DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the early stage, only mixed acid was used to enrich the low content of cadmium and cadmium compounds in rice, which inevitably introduced other metal ions, which caused the peak position of cadmium to shift when detected by the spectrophotometer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Accurately weigh 1.0 g of rice into a 100 mL beaker, add 16 mL of nitric acid and 4 mL of sulfuric acid, and heat the sample to digest until the digestion solution evaporates and no white smoke is emitted from the sample.

[0021] Dissolve the digested sample with deionized water, sonicate for 2h, filter, wash with deionized water several times, and transfer the filtrate to a 200mL volumetric flask to obtain a solution.

[0022] Take the above-mentioned dissolving solution and measure it with a spectrophotometer.

Embodiment 2

[0024] Accurately weigh 1.0 g of rice into a 100 mL beaker, add 16 mL of nitric acid and 4 mL of sulfuric acid, and heat the sample to digest until the digestion solution evaporates and no white smoke is emitted from the sample.

[0025] Dissolve the digested sample with deionized water, sonicate for 2h, filter, wash with deionized water several times, and transfer the filtrate to a 200mL volumetric flask to obtain a solution.

[0026] Take the above-mentioned dissolving solution and measure it with a spectrophotometer.

Embodiment 3

[0028] (1) Accurately weigh 1.0 g of rice into a 100 mL beaker, add 16 mL of nitric acid and 4 mL of sulfuric acid, and heat the sample to digest until the digestion solution evaporates and no white smoke is emitted from the sample.

[0029] (2) Dissolve the digested sample with deionized water, sonicate for 2h, filter, wash with deionized water several times, and transfer the filtrate to a 200mL volumetric flask to make the volume constant.

[0030] (3) Take 50 mL of the above solution and add 4 to 6 mL of ammonium citrate solution with a concentration of 100 to 300 g / L for preliminary enrichment of cadmium ions. The reaction formula is Cd 2+ +C 6 H 5 O 7 (NH 4 ) 3 →Cd(NH 4 ) 2 +C 6 H 5 O 7 (NH 4 ) 2+ , Add 2-3 drops of litmus reagent, adjust the pH to 7-8 with ammonia water to obtain the enriched liquid.

[0031] (4) Add the above-mentioned enrichment solution to sodium diethyldithiocarbamate with a mass concentration of 5% ((C 2 H 5 ) 2 NCSSNa·3H 2 O) Shake 5~8mL well, chelate cad...

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Abstract

The invention provides a pretreatment method for determination of the content of cadmium metal in rice; sodium diethyldithiocarbamate is chelated with cadmium ions to generate cadmium diethyldithiocarbamate, the chelate compound after chelating is extracted by carbon tetrachloride, the cadmium metal ions are selectively enriched, interference of other metal ions is eliminated, and thus the cadmium ions are selectively accurately measured.

Description

Technical field [0001] The invention relates to a pretreatment method for determining the content of cadmium metal, in particular to a pretreatment method for determining the content of cadmium metal in rice. Background technique [0002] Cadmium poisoning causes great damage to the liver and kidneys. Poisonous rice is frequently reported. The methods for accurately detecting the cadmium content in rice and other crops have their own advantages and disadvantages. The use of atomic spectrophotometer to detect cadmium content is easy to operate and has high detection sensitivity. However, in the early stage, only the mixed acid was used to enrich the low-content cadmium and cadmium compounds in rice. The method inevitably introduced other metal ions, which caused the shift of the cadmium element peak position during the spectrophotometer detection. In this method, sulfide is firstly used for chelation, then organic reagents are used for extraction and separation, and finally, cadm...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 池明刘鑫业李鹏廷
Owner DALIAN UNIV OF TECH QINGDAO NEW ENERGY MATERIALS TECH RES INST CO LTD
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