Gas chromatographic method for detecting residue amount of nine kinds of organophosphorus pesticide in rice

A technology of organophosphorus pesticides and gas chromatography, which is applied in the field of pesticide residue detection, can solve the problems of long time consumption, low efficiency, complicated extraction and purification process, etc., and achieve the effect of simplifying the sample pretreatment steps, good separation effect and shortening the detection time

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

[0005] At present, the detection of organophosphorus pesticide residues in rice mostly adopts the national standard GB/T5009.145-2003 method (determinatio...

Method used

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  • Gas chromatographic method for detecting residue amount of nine kinds of organophosphorus pesticide in rice
  • Gas chromatographic method for detecting residue amount of nine kinds of organophosphorus pesticide in rice
  • Gas chromatographic method for detecting residue amount of nine kinds of organophosphorus pesticide in rice

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Embodiment Construction

[0030] Mode 1: Detection of 9 organophosphorus pesticide residues in indica rice

[0031] (1) Sample pretreatment

[0032] ①Extraction Use an electronic balance to accurately weigh 10.0 g of the sample into a 250 ml beaker, add 20.0 ml of distilled water to soak for 30 min, then add 40.0 ml of acetonitrile, homogenate at 8000 rpm for 2 min at high speed, then filter with quantitative filter paper, and collect the filtrate Put it into a 100ml stoppered measuring cylinder filled with about 7 g of sodium chloride, collect the filtrate, cover the stopper, shake vigorously for 2 minutes, and let stand at room temperature for 40 minutes to separate the acetonitrile phase and the water phase;

[0033] ② Concentrate and draw 10.0 ml of acetonitrile solution into a 10.0 ml graduated test tube, put the test tube into the water bath of the nitrogen blowing instrument, control the temperature of the water bath at 45°C-50°C, and then stick the stainless steel ventilation needle of the nitr...

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Abstract

The invention relates to a gas chromatographic method for detecting the residue amount of nine kinds of organophosphorus pesticide in rice. Qualitative and quantitative detection on the pesticide residues of dichlorphos, acephate, omethoate, dimethoate, phorate, malathion, fenitrothion, isocarbophos and triazophos is achieved. The gas chromatographic method is characterized in that acetonitrile is used as extractant, extracting solutions are concentrated through a gas blowing concentrator, and after volume metering is carried out through acetone, trace analysis is directly carried out on a gas chromatograph. The gas chromatographic method has the advantages that the separating effect of a chromatographic column on a target object is good, the detection result is high in accuracy, reproducibility is good, and method sensitivity meets the technical requirement of multi-pesticide-residue detection; compared with the method of GB/T5009.145-2003 national standards (the detection of multiple kinds of residues of organophosphorus and carbamates pesticide in plant food), the gas chromatographic method is simpler, simplifies the pre-processing processes of samples, shortens detection time, and saves cost.

Description

technical field [0001] The present invention establishes a method for detecting nine kinds of organophosphorus pesticide residues in rice such as dichlorvos, acephate, omethoate, dimethoate, phorate, malathion, fenitrothion, isacarbophos, and triazophos A quantitative gas chromatography method belongs to the technical field of pesticide residue detection. Background technique [0002] China is the largest rice production and consumption country in the world. The rice planting area accounts for about 23% of the world, and the output accounts for more than 30%, ranking first in the world. Due to the long growth period of rice and the frequent occurrence of pests and diseases, agrochemicals are used in a large area, at high concentrations, and at high frequency, which plays a vital role in reducing the losses of pests and diseases, but this brings about the loss of rice. food safety issues. [0003] Organophosphorus pesticides are the most important pesticides used in rice fi...

Claims

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Application Information

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