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Gas chromatographic method for detecting pesticide residue of beta-cypermethrin in farmland surface water

A technology of high-efficiency cypermethrin and pesticide residues, applied in the field of gas chromatography, can solve the problems of farmland surface water and shallow groundwater pollution, and achieve the effect of simple and fast operation, high precision and high accuracy

Inactive Publication Date: 2013-12-25
邬金飞
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Problems solved by technology

[0004] Previous studies have shown that only 10%-20% of the pesticides sprayed in the field adhere to the crops, and the remaining 80%-90% enter the soil or escape into the air through evaporation, and the part of the pesticides that enter the soil is infiltrated, rainwater, etc. Scouring and other ways into the water body, causing serious pollution of farmland surface water and shallow groundwater

Method used

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  • Gas chromatographic method for detecting pesticide residue of beta-cypermethrin in farmland surface water
  • Gas chromatographic method for detecting pesticide residue of beta-cypermethrin in farmland surface water

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Embodiment Construction

[0029] Mode 1: Detection of beta-cypermethrin residues in field ditch water

[0030] (1) Pretreatment of field ditch water samples

[0031] ①Take 200ml of water sample, filter it with filter paper and transfer it to a 500ml separatory funnel, add 10g of salting-out agent sodium chloride, shake to dissolve;

[0032] ② Add 50ml of n-hexane for vibration extraction (extraction). When starting vibration extraction, open the lid of the separatory funnel several times to exhaust air, and then let it stand for stratification;

[0033] ③Put the lower water phase into another separatory funnel, and release some organic phase (to prevent the water phase from remaining);

[0034] ④ After the upper organic phase (extract) was dehydrated by anhydrous sodium sulfate, it was collected into a 250ml rotary evaporating flask (put a triangular funnel on the rotary evaporating flask, and a little absorbent cotton, 2cm of anhydrous sulfuric acid Sodium, before putting the extract, wet it with n-...

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Abstract

The invention provides a gas chromatographic method for detecting a pesticide residue of beta-cypermethrin in farmland surface water. The gas chromatographic method is characterized by taking n-hexane as an extracting agent; concentrating an extracting solution by using a rotary evaporator; achieving the metered volume by using the n-hexane; and directly carrying out trace analysis on a gas chromatograph. The gas chromatographic method has the advantages that firstly, the content of the beta-cypermethrin and a peak area have a good linear relation (in a range of 0.05mg / kg-5.0mg / kg), the accuracy of a detection result is high, the precision is high and the method sensitivity reaches the detection requirements of residual pesticides; secondly, a pre-treatment method of samples is optimized and a florisil column purification link is eliminated, so that the operation is simple, convenient and rapid, the cost is saved and the working efficiency is improved.

Description

technical field [0001] The invention establishes a gas chromatography method for detecting residual amount of beta-cypermethrin pesticide in farmland surface water, and belongs to the technical field of pesticide residue detection. Background technique [0002] Pyrethroid pesticides are a class of insecticides that emerged in the 1970s and 1980s. It has the characteristics of high efficiency, broad spectrum, low toxicity and low residue. Pyrethroid insecticides used in agriculture mainly include beta-cypermethrin, deltamethrin, fenvalerate, fenvalerate, beta-cyhalothrin, bifenthrin, and cyfluthrin. Among them, beta-cypermethrin has the largest application volume and sales volume, ranking among the best among agricultural pyrethroid insecticides. [0003] Beta-cypermethrin is an insecticide with high biological activity. It is composed of high-efficiency isomers of cypermethrin. The insecticidal activity is about 1-3 times that of cypermethrin. It is mainly used in fruit tr...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
Inventor 邬金飞
Owner 邬金飞
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