Pre-treatment and quantitative analysis method for rapid determination of content of cadmium element in rice

A technology for rapid determination and element content, applied in the preparation of test samples, measurement of color/spectral characteristics, etc., can solve the problems of difficult to guarantee the accuracy of results, cumbersome pre-processing process, difficult operation, etc., to achieve accuracy and repeatability. Good performance, saving pre-processing time, and quick operation

Active Publication Date: 2014-02-26
SHIMADZU (CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among these methods, the wet method consumes a large amount of acid, takes a long time, and is difficult to operate; the dry ashing method needs to first heat the sample to carbonize, then transfer it to a muffle furnace for high-temperature ashing, and add acid after cooling. The process of dissolving to a constant volume is cumbersome and time-consuming; high-pressure digestion tank digestion requires the use of an oven to heat and digest the samples and digestion solution in the tank, which also has the problem of time-consuming; microwave digestion uses microwave heating to dig

Method used

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  • Pre-treatment and quantitative analysis method for rapid determination of content of cadmium element in rice
  • Pre-treatment and quantitative analysis method for rapid determination of content of cadmium element in rice
  • Pre-treatment and quantitative analysis method for rapid determination of content of cadmium element in rice

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Embodiment 1

[0028] A pretreatment and quantitative analysis method for rapidly determining the content of cadmium in rice, comprising the following steps:

[0029] (1) Grind the husked brown rice with a mill so that all the brown rice flour can pass through a 40-mesh sieve, put it in a sealed bag, mix well, weigh 0.25 g of the sample in a 25 mL colorimetric tube, and weigh 6 parts Parallel samples, numbers are A~F;

[0030] (2) Weigh 0.4 g of agar powder into a 1 L beaker, add slightly less than 500 mL of ultrapure water, heat to dissolve the agar, let it stand to cool, add water to 500 mL, and prepare a 0.8 g / L agar solution for later use ;

[0031] (3) Dilute samples A~F to 25 mL with the agar solution obtained in step (2) to obtain the suspensions of samples A~F respectively. Take 0.6 mL of the suspensions of samples A~F respectively in 2 mL sample cups , dilute 2.5 times with 1% dilute nitric acid to obtain the rice samples A to F to be tested; process the quality control sample GBW...

Embodiment 2

[0041] A pretreatment and quantitative analysis method for rapidly determining the content of cadmium in rice, comprising the following steps:

[0042] (1) Grind the husked brown rice with a mill so that all the brown rice flour can pass through a 40-mesh sieve, put it in a sealed bag, mix well, weigh 1.0 g of the sample in a 25 mL colorimetric tube, and weigh 6 parts Parallel samples, numbers are A~F;

[0043] (2) Weigh 0.75 g of agar powder into a 1 L beaker, add slightly less than 500 mL of ultrapure water, heat to dissolve the agar, let it cool down, add water to 500 mL, and prepare a 1.5 g / L agar solution for later use ;

[0044] (3) Dilute samples A~F to 25 mL with the agar solution obtained in step (2) to obtain suspensions of samples A~F respectively; take 0.6 mL of suspensions of samples A~F respectively in 2 mL sample cups , dilute 2.5 times with 1% dilute nitric acid to obtain the rice samples A to F to be tested; process the quality control sample GBW10045 in the...

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Abstract

The invention relates to a pre-treatment and quantitative analysis method for rapid determination of the content of the cadmium element in rice. The method comprises the following steps (1) crushing rice into powder; (2) preparing an agar solution with a concentration of 0.8 to 1.5 gL; (3) weighing a plurality of parts of rice powder as parallel samples, respectively subjecting the parallel samples to suspension and volume fixation with the agar solution prepared in the step (2), carrying out dilution with dilute nitric acid so as to obtain to-be-measured sample liquids with rice concentration of 4 to 16 gL and directly diluting the agar solution obtained in the step (2) with dilute nitric acid so as to obtain a blank sample; (4) preparing cadmium standard solutions, determining the absorbance value of each cadmium standard solution by using graphite furnace atomic absorption spectrometry and drafting a cadmium element standard curve; and (5) determining the absorbance values of the to-be-measured sample liquids and the blank sample and calculating cadmium content of the to-be-measured sample liquids. The method provided by the invention is simple and fast, can rapidly detect the content of the cadmium element in rice and has good accuracy and repeatability.

Description

technical field [0001] The invention belongs to the technical field of rapid analysis and detection, in particular to a pretreatment and quantitative analysis method for rapidly determining the content of cadmium in rice. Background technique [0002] In the quantitative analysis method for detecting the content of cadmium in rice, it is usually necessary to digest the pulverized sample with acid with the help of pre-treatment equipment before detection. Commonly used sample pretreatment methods include: wet digestion, dry ashing, microwave digestion and high-pressure digestion tank digestion, etc. Among these methods, the wet method consumes a large amount of acid, takes a long time, and is difficult to operate; the dry ashing method needs to first heat the sample to carbonize, then transfer it to a muffle furnace for high-temperature ashing, and add acid after cooling. The process of dissolving to a constant volume is cumbersome and time-consuming; high-pressure digesti...

Claims

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Application Information

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IPC IPC(8): G01N1/34G01N21/33
Inventor 陈建立孙友宝黄涛宏
Owner SHIMADZU (CHINA) CO LTD
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