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Rapid extraction and detection method for lead and cadmium in cereal

A detection method and grain technology, which are applied in the field of rapid extraction and detection of lead and cadmium in grains, can solve the problems of low detection limit, difficult to popularize and use on a large scale, troublesome maintenance and use, etc., and achieve simple operation and good market application prospects. , the effect of highly sensitive detection

Inactive Publication Date: 2019-12-24
WUHAN ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Glassy carbon electrodes and gold electrodes are commonly used electrodes in electrochemical detection methods. They have the advantages of wide potential window and low detection limit, but they are troublesome to maintain and use, and need to be cleaned and polished before each test, which is not easy to be widely used.

Method used

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  • Rapid extraction and detection method for lead and cadmium in cereal
  • Rapid extraction and detection method for lead and cadmium in cereal
  • Rapid extraction and detection method for lead and cadmium in cereal

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Take the standard material for component analysis of rice flour (GBW(E)100348, Steel Research Nanoco Testing Technology Co., Ltd.), dissolve 1g of rice standard powder in 5g of 10vol.% sulfuric acid, shake it by hand for 2min, and then let it stand for 3min , after extracting lead ions, add acetic acid-sodium acetate-ammonium acetate (volume ratio is 3:4:3) buffer solution, mercuric nitrate (final Concentration is 10mg / kg) and sodium sulfite (final concentration is 5wt.‰), is configured into lead standard solution with lead ion concentration of 0, 50, 130, 150, 180, 210 and 240ppb;

[0030] (2) After connecting the screen printing electrode to the portable electrochemical workstation, put it into the lead standard solution in step (1), select square wave voltammetry, the potential window is -1V--0.5V, the voltage increment is 4mV, and the amplitude 0.025V, frequency 15Hz, enrichment potential -1.5V, enrichment time 200s; record the current value, test the lead stand...

Embodiment 2

[0033] (1) First get rice No. 1 sample 100g (150ppb cadmium content), pulverize with a pulverizer, and cross a 40-mesh sieve;

[0034] (2) Take 1 g of the crushed and sieved rice sample in a centrifuge tube, add 5 g of 10 vol.% sulfuric acid, shake it by hand for 2 minutes, and then let it stand for 3 minutes;

[0035] (3) Take 1 mL of acetic acid-sodium acetate-ammonium acetate buffer solution with a volume ratio of 3:4:3, add mercuric nitrate with a final concentration of 10 mg / kg, and then add 10 μL of 5wt.% sodium sulfite, mix well to obtain a blank solution, Add 200 μl of the supernatant in step (2), and mix evenly to obtain a mixed solution;

[0036] (4) After the screen printing electrode is connected to the portable electrochemical workstation, test the blank solution and the mixed solution in step (3) successively, select square wave voltammetry, potential window -1V--0.5V, voltage increase Amount of 4mV, amplitude 0.025V, frequency 15Hz, enrichment potential -1.5V, ...

Embodiment 3

[0050](1) Take the standard material for component analysis of rice flour (GBW(E)100348, Steel Research Nanke Testing Technology Co., Ltd.), dissolve 1g of rice standard powder with 5g of 10vol.% hydrochloric acid, shake it by hand for 2min, and then let it stand for 5min After extracting cadmium ions, add acetic acid-sodium acetate-ammonium acetate (volume ratio 3:4:3) buffer solution, bismuth nitrate (final Concentration is 1mg / kg) and potassium iodide (final concentration is 5wt.‰), configured into standard solutions with cadmium ion concentrations of 50, 130, 150, 180, 210 and 240ppb;

[0051] (2) After connecting the screen printing electrode to the portable electrochemical workstation, put it into the lead standard solution in step (1), select square wave voltammetry, the potential window is -1V--0.5V, the voltage increment is 4mV, and the amplitude 0.025V, frequency 15Hz, enrichment potential -1.5V, enrichment time 200s; record the current value, test the cadmium standa...

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Abstract

A rapid extraction and detection method for lead and cadmium in cereal comprises the following steps of smashing and sieving a cereal sample, mixing, oscillating and uniformly shaking with an extraction liquid, allowing to stand, and obtaining a sample processing liquid; taking and adding an acetic acid-sodium acetate-ammonium acetate buffer liquid into a modifier and a masking agent, performing uniform mixing, and adding the sample processing liquid in the step S1 to obtain a detection solution; and detecting the detection solution in the step S2 by a screen-printed electrode and an adsorptive stripping voltammetry method. Sample pre-processing is simple and rapid, detection is sensitive, interference resistance is achieved, special expensive machine and reagent are not needed, and side rapid screening can be achieved by a portable device.

Description

technical field [0001] The invention relates to the technical field of grain heavy metal analysis, in particular to a rapid extraction and detection method for lead and cadmium in grain. Background technique [0002] Food quality and safety are related to the national economy and people's livelihood. With the rapid development of my country's industrialization, heavy metal pollution is becoming more and more serious. Heavy metal pollutants can enter the food crops through the soil, water and atmosphere in the food crop planting area, eventually leading to excessive heavy metal content in food. In recent years, people's living standards have been continuously improved, and people have paid more attention to their own health. People have also paid more and more attention to the quality and safety of food. Long-term intake of food with heavy metal lead and cadmium content exceeding the standard will seriously affect human health. The rapid extraction and quantitative detection...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/26G01N27/48G01N1/28G01N1/38G01N1/34
CPCG01N1/286G01N1/34G01N1/38G01N27/26G01N27/30G01N27/48
Inventor 战艺芳曾令文王嫦嫦曹飘杨刘萌萌夏定王利华姚琪肖康飞韩艳云
Owner WUHAN ACADEMY OF AGRI SCI