Method for detecting organophosphorus and carbamate pesticide residue

A carbamate and detection method technology, applied in the field of detecting organophosphorus and carbamate pesticide residues, can solve problems such as inability to accurately judge pesticide residues, low sensitivity detection limit, color development time deviation, etc., and achieve low cost , The effect of low environmental conditions and avoiding the deviation of color rendering data

Inactive Publication Date: 2009-11-11
CHINA AGRI UNIV
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Problems solved by technology

[0003] Although the enzyme inhibition rate method used in the national standard has high sensitivity and low detection limit, and can quickly judge whether the residues of organophosphorus and carbamate pesticides in vegetables, fruits and other agricultural products exceed the standard, the specified method It is necessary to measure the absorbance value before the reaction and af

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  • Method for detecting organophosphorus and carbamate pesticide residue
  • Method for detecting organophosphorus and carbamate pesticide residue
  • Method for detecting organophosphorus and carbamate pesticide residue

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Embodiment 1

[0035] Example 1, the detection of organophosphorus and carbamate pesticide residues in spinach leaves

[0036] 10 samples were selected, and organophosphorus and carbamate pesticides were determined respectively according to the spectrophotometric method stipulated in GB / T 5009.199-2003 and the colorimetric method of the present invention. The results are shown in Table 1. There is no significant difference in the inhibition rate detected by the two detection methods, and the correlation coefficient is 0.9975, indicating that the two have high consistency, and the final judgment results are completely consistent. The chromaticity method of the invention ensures the consistency of color development time when acquiring pictures, and avoids the error introduced by the inconsistency of color development time between samples and blank samples. The operation is simpler and more suitable for the needs of rapid detection.

[0037] Table 1 spectrophotometry and colorimetry detection ...

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Abstract

The invention discloses a method for detecting organophosphorus and carbamate pesticide residue, which is to determine whether a sample to be tested contains organophosphorus or/and carbamate pesticides according to the suppression ratio of an extracting solution of the sample to be tested on cholinesterase, wherein the suppression ratio of the extracting solution of the sample to be tested on the cholinesterase is determined through the chromatic value of the extracting solution of the sample to be tested. The chromatic value is acquired through digital image processing technology. The method greatly improves detection efficiency, is particularly suitable for the mass detection of vegetable samples, and has the advantages of high automation degree, high measurement accuracy, quick, simple and convenient operation, few needed instruments and equipment, low cost, low requirement on environmental conditions of the determination, and no pollution.

Description

technical field [0001] The invention relates to a method for detecting residues of organophosphorus and carbamate pesticides. Background technique [0002] At present, the detection methods for organophosphorus and carbamate pesticides mainly include thin-layer chromatography, gas chromatography, and spectrophotometry. The first two methods have high detection accuracy and can achieve quantitative detection of each pesticide. , the instrument is expensive and requires special personnel to operate, so it is difficult to meet the market demand of fast, simple and easy operation. The national standard GB / T 5009.199-2003 stipulates that the detection of organophosphorus and carbamate pesticides in food adopts the enzyme inhibition rate method. The method is to determine whether the test sample contains organophosphorus or carbamate pesticides according to the inhibitory rate of the test sample extract to the cholinesterase. The principle of this method is: under normal circums...

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Application Information

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IPC IPC(8): G01N21/25
Inventor 侯彩云安瑜祝晓芳许伟牛巍
Owner CHINA AGRI UNIV
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