Rapid detection method and pretreatment method of organochlorine pesticides and pyrethroid pesticides in tea

A pyrethroid and organochlorine technology, which is applied in the field of food safety testing, can solve the problems of long processing time, high cost, and high solvent consumption of pre-treatment technology, and achieve the effects of shortening processing time, reducing processing cost, and reducing interference

Inactive Publication Date: 2017-01-04
COFCO GROUP +1
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the existing sample pretreatment technology, such as long processing time, high solvent consumption, and high cost, and develop a fast, low-cost, high-efficiency analysis of organochlorine pesticides and pyrethroid pesticides in tea Method and its pretreatment technology

Method used

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  • Rapid detection method and pretreatment method of organochlorine pesticides and pyrethroid pesticides in tea
  • Rapid detection method and pretreatment method of organochlorine pesticides and pyrethroid pesticides in tea
  • Rapid detection method and pretreatment method of organochlorine pesticides and pyrethroid pesticides in tea

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: the drawing of working curve

[0049] The blank tea matrix was used to prepare 25 mixed standard working solutions of organochlorine and pyrethroid pesticides, and the peak area versus concentration was used to make a working curve. The linear range, linear equation and correlation coefficient are shown in Table 1.

[0050] figure 1 The standard chromatogram of the above mixed standard working solution at a concentration of 0.050 μg / mL is shown. Depend on figure 1 Visible, according to the experimental method of the present invention, 25 kinds of organochlorine and pyrethroid pesticides are well separated.

[0051] Table 1 Linear range, linear equation and correlation coefficient

[0052]

Embodiment 2

[0053] Embodiment 2: Method spike recovery and precision experiment

[0054] Weigh 2.5g of blank tea matrix, add appropriate amount of pesticide standard respectively, so that the spiked concentration of each pesticide is 10 times the limit of quantification (LOQ: S / N=10), the experiment is performed 5 times in parallel, and the average recovery rate of the method is calculated and relative standard deviation, the results are shown in Table 2.

[0055] Table 2 is the average recovery rate, relative standard deviation and detection limit of 25 kinds of pesticide addition experiments

[0056]

[0057] As can be seen from the above Table 1 and Table 2, the pretreatment technology of the present invention and the detection method using this technology have good detection separation for various organochlorines and pyrethroids, and the linear range is wide, and excellent detection can be obtained. Accuracy.

[0058] Comparison with the existing technology: At present, the natio...

Embodiment 3

[0059] Embodiment 3: Actual sample detection experiment

[0060] According to the experimental method of the present invention, the pesticide residues in 3 commercially available actual tea samples were detected, and the mixed standard working solution was prepared from the tea samples to be tested, and quantified by the external standard method. The result is as figure 2 shown. Depend on figure 2 It can be seen that the 25 organochlorine and pyrethroid pesticides were not significantly detected in the three actual tea samples.

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Abstract

The invention relates to a pretreatment method for detecting organochlorine and pyrethroid pesticide residues in a tea sample. The pretreatment method of organochlorine pesticides and pyrethroid pesticides in the tea sample comprises steps as follows: (1), smashing; (2), extracting; (3), purifying; (4), filtering to obtain a to-be-measured liquid sample for GC-ECD (gas chromatography-electron capture detection) analysis. The method is simple and rapid, the pretreatment time of the sample is shortened, besides, the solvent consumption is low, matrix interference is effectively reduced, and one rapid, effective and low-cost sample pretreatment technology is provided for simultaneous detection of organochlorine and pyrethroid pesticide residues in the tea.

Description

technical field [0001] The present invention relates to a rapid sample pretreatment method of organochlorine pesticides and pyrethroid pesticides in tea, and also relates to using the pretreatment method to analyze the residues of organochlorine pesticides and pyrethroid pesticides in tea by using gas chromatography-electron capture detector Quantitative testing technology belongs to the field of food safety testing. Background technique [0002] Organochlorine pesticides have been widely used in agricultural production in countries all over the world. Their structures are stable, not easy to degrade, and pollute the environment. my country banned the production and use of organochlorine pesticides in 1983, but until now, the residual organochlorine pesticides in water and soil are still Hazards to human health through crops. The chemical structure of pyrethroid pesticides is similar to that of natural pyrethrins, and they are biomimetic insecticides. Due to their advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/06
Inventor 章晴史晓梅陈士恒高丁杨永坛
Owner COFCO GROUP
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