Gas chromatographic method for detecting residues of high-toxic organophosphorus pesticides in soil

An organophosphorus pesticide and gas chromatography technology, applied in the field of pesticide residue detection, can solve problems affecting biological activities, pollution of agricultural products, ecological safety and water environment safety, etc., and achieve the goal of simplifying the pretreatment process, saving costs and shortening the detection time Effect

Inactive Publication Date: 2013-12-25
邬金飞
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  • Application Information

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Problems solved by technology

Pesticide residues in the soil affect the activities of organisms in the soil; are absorbed by crops, causing pollution of agricultural products; pollute water bodies with irrigation water, surface water runoff and rainwater, seriously affecting agricultural soil ecological security and water environment security

Method used

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  • Gas chromatographic method for detecting residues of high-toxic organophosphorus pesticides in soil
  • Gas chromatographic method for detecting residues of high-toxic organophosphorus pesticides in soil
  • Gas chromatographic method for detecting residues of high-toxic organophosphorus pesticides in soil

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Embodiment Construction

[0029] Method 1: Detection of five highly toxic organophosphorus pesticide residues in clay

[0030] (1) Pretreatment of clay soil samples

[0031] ①Extraction Use an electronic balance to accurately weigh 15.0g of soil sample into a 250ml Erlenmeyer flask with a stopper, add 15ml of distilled water and 50ml of acetonitrile, vibrate at 200r / min for 30min on a water bath (25±1)°C shaker, then filter with absorbent cotton , the filtrate was collected in a 100 ml stoppered graduated cylinder containing 7 g of sodium chloride, shaken vigorously for 1 min, and allowed to stand at room temperature for 30 min to separate the acetonitrile and aqueous phases;

[0032] ②Purification Draw 10.0 ml of acetonitrile solution from a 100 ml stoppered cylinder into a 15 ml graduated test tube, heat the test tube in a water bath, control the temperature of the water bath at 65°C, and slowly pass nitrogen or air into the test tube, When the sample solvent is volatilized and concentrated to near ...

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Abstract

The invention relates to a gas chromatographic method for detecting residues of five high-toxic organophosphorus pesticides in different texture soils(loam, clay and sandy soil) so as to realize the qualitative and quantitative detection on the residues of methamidophos, parathion, methyl parathion, monocrotophos and phosphamidon pesticides in the soils. The gas chromatographic method is characterized in that acetonitrile is taken as an extracting agent, and after an extraction solution is concentrated with constant volume and is filtered, the trace analysis is directly carried out by using a gas chromatograph. The gas chromatographic method has the advantages that firstly a chromatographic column has a good separation effect on a target object, the accuracy degree of detection results is high, the reproducibility is good, and the sensitivity of the method meets the detection requirements of the residual pesticides; secondly compared with a GB/T14552-2003 (gas chromatographic method for determining organophosphorus pesticides in water and the soil), the national standard method is easier and more convenient, a pretreatment process of soil samples is simplified, the detection time is shortened, and the cost is saved.

Description

technical field [0001] The invention establishes a gas chromatography method for detecting highly toxic organophosphorus pesticide residues in soils with different textures (loam, clay, and sandy soil), and belongs to the technical field of pesticide residue detection. Background technique [0002] Since January 1, 2007, my country has completely prohibited the domestic sale and use of five highly toxic organophosphorus pesticides, methamidophos, parathion, methyl parathion, monocrotophos, and phosphamide. It is highly toxic to animals such as bees, birds, silkworms and other environmental organisms, and it is also highly toxic to agricultural beneficial organisms such as spiders. [0003] According to regulations, these five highly toxic pesticides should have been withdrawn from the market, but because these pesticides are cheap and effective in killing insects, many producers are still using them in violation of regulations. In the annual routine monitoring of agricultura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
Inventor 邬金飞
Owner 邬金飞
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