Methods for quickly detecting content of heavy metal elements in rice and evaluating comprehensive pollution index of heavy metal elements

A technology for element content and heavy metals, applied in measuring devices, color/spectral characteristic measurements, instruments, etc., can solve problems such as inability to fully reflect the degree of heavy metal pollution, and achieve the effect of avoiding cumbersome details and shortening the analysis time

Inactive Publication Date: 2014-10-22
GUANGDONG GRAIN SCI INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the different degrees of harm of various heavy metal elements in rice to various groups of peopl

Method used

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  • Methods for quickly detecting content of heavy metal elements in rice and evaluating comprehensive pollution index of heavy metal elements
  • Methods for quickly detecting content of heavy metal elements in rice and evaluating comprehensive pollution index of heavy metal elements
  • Methods for quickly detecting content of heavy metal elements in rice and evaluating comprehensive pollution index of heavy metal elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1 Rapid Determination of Cadmium Element Content in Paddy

[0054] (1) Sample pretreatment

[0055]According to the grain and oil sample separation method, the grain samples are mixed evenly, and the 2Kg original sample is separated by a bell-shaped sample divider, and then the samples are divided step by step, and finally two parallel samples of each 50g are obtained. For processing, put the sample on a tray, pick out inorganic or organic impurities, take the clean rice and use a huller to hustle it into brown rice, and then use a cyclone mill without moisture loss to pulverize the brown rice, put it in a sealed bag, and mix it evenly. Obtain a sample of brown rice flour;

[0056] (2) Rapid determination of cadmium content in rice

[0057] Determination method: take the brown rice flour sample in step (1) and place it in a quartz tube for carbonization at 500°C to 600°C for 20min, take out the charcoal after cooling, weigh the mass of the charcoal, and calcul...

Embodiment 2

[0082] Example 2 Rapid Determination of Lead Element Content in Paddy

[0083] Sample pretreatment and assay method refer to embodiment 1;

[0084] ① Correlation test

[0085] Weigh the brown rice flour sample of known heavy metal lead content value of 0.30mg / Kg (the sample with high content of lead in the rice is not easy to obtain, currently only has the known value sample of 0.3mg / Kg) and blank powder (theoretically does not contain lead element Ground rice), mix out the mixed powder that heavy metal lead content is 0.05 to 0.3mg / Kg, get 4 points, measure the strength ratio of mixed powder according to the assay method described in embodiment 1 step (2) (read out from instrument measurement result ), draw the correlation curve, see Table 7 and image 3 .

[0086] Table 7 Correlation test records of lead element content

[0087]

[0088] ②Accuracy test

[0089] Measure according to the assay method described in embodiment 1 step (2) " national standard material Sichu...

Embodiment 3

[0107] Example 3 Rapid determination of arsenic and mercury content in rice

[0108] ① Weighing of sample pretreatment

[0109] Prepare "National Standard Material Hunan Rice" (GBW10045 (GSB-23)) brown rice flour sample according to embodiment 1; Get the brown rice flour sample of 0.5g and place in a tall shape small beaker, and add 10mL superior grade pure concentrated nitric acid and 4 Drop analytically pure perchloric acid, cover with a concave glass slide, digest by wet method, and react for 3h ( Figure 4 );

[0110] ② Digestion of sample pretreatment ( Figure 5 )

[0111] Move the beaker to an anti-corrosion electric heating plate for heating and digestion, keep the temperature at 100°C for half an hour, let it smoke slowly; then raise the temperature to 220°C and keep it for 2 hours; when the volume of the digestive solution is about 0.3mL, white smoke will come out, Continue to heat for 4min, then add 1mL deionized water to drive away the acid, continue to evapora...

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Abstract

The invention belongs to the field of food detection, and in particular relates to methods for quickly detecting the content of heavy metal elements in rice and evaluating a comprehensive pollution index of the heavy metal elements. The method for quickly detecting the content of the heavy metal elements in the rice comprises the following steps: (1) pretreating a sample; (2) quickly detecting the content of a cadmium element and the content of a lead element in the rice; (3) quickly detecting the content of an arsenic element and the content of a mercury element in the rice. The method for evaluating the comprehensive pollution index of the heavy metal elements in the rice comprises the following steps: (1) measuring the contents of the cadmium element, the lead element, the arsenic element and the mercury element in the sample according to the detection method; (2) calculating pollution factor values of all the elements; (3) constructing a hierarchical relation among all indexes according to the pollution factor values of all the elements, and determining weights of the indexes so as to obtain a comprehensive pollution factor value in the rice, thus obtaining the pollution level of the harmful heavy metals in the rice. The methods are simple and time-saving, and the pollution degree of the heavy metals in the rice can be quickly, comprehensively and objectively reflected.

Description

technical field [0001] The invention belongs to the field of food detection, and in particular relates to a method for quickly detecting the content of heavy metal elements in rice and evaluating its comprehensive pollution index. Background technique [0002] Various domestic testing institutions have received testing tasks related to heavy metal elements, especially the testing of lead, cadmium, mercury and arsenic stipulated in food hygiene standards. When inspectors are engaged in the above four elemental analysis experiments, the sample pretreatment process is more complicated and cumbersome, accounting for more than 70% of the entire analysis process, and the processing effect determines the credibility of the test results. [0003] At present, the single factor evaluation method is widely used in the evaluation method of heavy metal pollution in rice. Due to the different degrees of harm of heavy metal elements in rice to various groups of people, the single factor e...

Claims

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Application Information

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IPC IPC(8): G01N23/223G01N21/31
Inventor 王亚军潘传荣陈嘉东钟国才刘耀伟吴秋婷关则恳邓常继曾彩虹
Owner GUANGDONG GRAIN SCI INST
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