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Dynamic degradation analysis method of acephate and metabolite methamidophos in leafy vegetables

A technology for acephate and metabolites, which is applied in the field of pesticide detection, can solve the problems of difficult identification of whether there is illegal use of methamidophos in leafy vegetables, and difficulties in the quality and safety supervision and law enforcement of agricultural products, so as to eliminate matrix effects and avoid residues Phytotoxicity, the effect of improving detection sensitivity and accuracy

Pending Publication Date: 2020-03-13
金华市农产品质量综合监督检测中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, in the detection and supervision of pesticide residues in leafy vegetables, it has been found that exceeding the standard of methamidophos residues in leafy vegetables still occurs from time to time, and there are cases where acephate and methamidophos exceed the standard at the same time, and the final law enforcement can only be based on acephate Phosphorus exceeds the standard for treatment, it is difficult to identify whether there is a phenomenon of illegal use of methamidophos in leafy vegetables that have been applied with acephate
Judging from the current research situation at home and abroad, when acephate and methamidophos are detected at the same time or exceed the standard, it is impossible to judge whether all of them are caused by the application of acephate, which will bring great impact to the supervision and law enforcement of agricultural product quality and safety. difficulty

Method used

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  • Dynamic degradation analysis method of acephate and metabolite methamidophos in leafy vegetables
  • Dynamic degradation analysis method of acephate and metabolite methamidophos in leafy vegetables
  • Dynamic degradation analysis method of acephate and metabolite methamidophos in leafy vegetables

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Embodiment 1

[0046]A method for analyzing dynamic degradation of acephate and metabolite methamidophos in leafy vegetables, comprising the steps of:

[0047] (1) Test layout:

[0048] Set up two areas in the open air and greenhouses, and set up a blank control area and three test areas in each area, and the area of ​​the blank control area and the three test areas is 15m 2 , There is an isolated area at the junction of each community, and Chinese cabbage is planted in the above-mentioned areas;

[0049] (2) Acephate application treatment:

[0050] Select the dilution factor C of the acephate solution with a concentration of 99% 1 、C 2 、C 3 Three concentrations of 500, 1000, and 1500 times of dilution were used to spray pesticides to different test areas respectively, and C 1 、C 2 、C 3 The frequency of application is 2 times, and the interval between application is 7 days. Sampling was collected; no drug was applied in the blank control area, and samples were only taken at 0, 7, and...

Embodiment 2

[0076] A method for analyzing dynamic degradation of acephate and metabolite methamidophos in leafy vegetables, comprising the steps of:

[0077] (1) Test layout:

[0078] Set up two areas in the open air and greenhouses, and set up a blank control area and three test areas in each area, and the area of ​​the blank control area and the three test areas are both 20m 2 , There is an isolation area at the junction of each community, and shepherd's purse is planted in the above-mentioned areas;

[0079] (2) Acephate application treatment:

[0080] Select the dilution factor C of the acephate solution with a concentration of 99% 1 、C 2 、C 3 Three concentrations of 500, 1000, and 1500 times of dilution were used to spray pesticides to different test areas respectively, and C 1 、C 2 、C 3 The frequency of application is 2 times, and the interval between application is 7 days. Sampling was collected; no drug was applied in the blank control area, and samples were only taken at ...

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Abstract

The invention provides a dynamic degradation analysis method of acephate and metabolite methamidophos in leafy vegetables. The method comprises the following steps: test layout, acephate application,sample extraction, blank standard solution preparation, drawing of an acephate standard solution curve and a methamidophos standard solution curve, relative standard deviation determination and concentration detection of acephate and methamidophos in leafy vegetables. According to the invention, degradation rules and main influence factors of acephate and metabolite methamidophos in leafy vegetables are analyzed, so that a scientific basis is provided for reasonably using acephate, avoiding residual phytotoxicity to later-crop sensitive crops and determining the planting time of leafy vegetables.

Description

technical field [0001] The invention relates to the field of pesticide detection, in particular to a dynamic degradation analysis method of acephate and metabolite methamidophos in leafy vegetables. Background technique [0002] Acephate is a systemic low-toxic insecticide, which has stomach poisoning and contact killing effects, can kill eggs, and has a certain fumigation effect. It has a wide insecticidal spectrum and can control more than 100 kinds of pests. It has high efficacy. It has a moderate duration and is suitable for the control of crop pests such as grain, leafy vegetables, and fruit trees. Acephate is the acetylated product of methamidophos, its toxicity is more than 30 times lower than that of methamidophos, and its half-life in plant tissues is 5-10 days. [0003] Methamidophos is a highly toxic organophosphorus insecticide with broad insecticidal spectrum, good insecticidal effect, low use cost and slow resistance development. Due to its high toxicity, it ...

Claims

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Application Information

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IPC IPC(8): G01N30/06G01N30/74
CPCG01N30/06G01N30/74
Inventor 刘莉虞淼吾建祥刁莹军虞冰杨德毅马婧妤
Owner 金华市农产品质量综合监督检测中心
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