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Processing method of sample containing pesticide vamidothion before measurement

A treatment method, a technology for killing aphid and phosphorus, which can be used in measuring devices, instruments, scientific instruments, etc., and can solve problems such as not being found.

Inactive Publication Date: 2011-08-03
CENT LAB TIANJIN ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sample pretreatment method established in this patent is a method developed by our unit, and no relevant reports have been found in domestic public literature

Method used

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  • Processing method of sample containing pesticide vamidothion before measurement
  • Processing method of sample containing pesticide vamidothion before measurement
  • Processing method of sample containing pesticide vamidothion before measurement

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Weigh 20g of rice (accurate to 0.01g), add 50mL of acetonitrile, shake for 30min, filter into a separatory funnel, add 10mL of acetonitrile to wash the residue, and filter the washing liquid into a separatory funnel. Add 8g of sodium chloride, oscillate and let stand to separate layers, discard the lower aqueous phase, take the upper acetonitrile phase to dehydrate with anhydrous sodium sulfate, concentrate to dryness, and dilute to 2mL with acetone / n-hexane (V / V=1 / 1) , vortexed for 1 min, and transferred to an injection vial for testing.

Embodiment 2

[0033] The sample treated in Example 1 was adopted with Agilent7890A gas chromatograph (with FPD), inlet temperature: 250°C; injection volume: 2μL; chromatographic column: DB-1701, 30m×0.25mm, 0.25μm; carrier gas :N 2 (≥99.99%); constant pressure mode: 25psi, heating program: 60°C (1min) 20℃ / min 250°C (8min);

[0034] Detector temperature: 250°C; hydrogen flow rate: 75mL / min; air flow rate: 100mL / min; makeup gas flow rate: 60mL / min. To measure.

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Abstract

The invention discloses a processing method of a sample containing pesticide vamidothion before measurement, and the method comprises the following steps: weighing 20g (correct to 0.01g) of the sample; adding 50ml of acetonitrile; oscillating for 30 minutes; filtering to a separating funnel; adding 10ml of acetonitrile to wash residues; filtering the washing liquid into the separating funnel; adding 8g of sodium chloride; oscillating and standing to delaminate; abandoning a water phase at the lower layer; taking an acetonitrile phase at the upper layer to be dewatered through anhydrous sodium sulfate; concentrating to be dry; making constant volume 2ml through acetone / hexane (V / V=1 / 1); whirling for 1 minute; and shifting to sampling bottles so as to be measured. The processing method of the residual sample before the measurement disclosed by the invention has the characteristics of high measurement speed, simple equipment, low measurement cost and high accuracy, stability and reliability.

Description

Technical field: [0001] The invention belongs to the technical field of determination of pesticide residues, and relates to a method for determining the residues of pesticide aphidion. In particular, it is a pre-determination method for samples containing aphidion. Background technique: [0002] Pesticide residues refer to the phenomenon that a part of pesticides directly or indirectly remain in grains, vegetables, fruits, livestock products, aquatic products, soil and water after pesticides are applied in agricultural production. The problem of pesticide residues arises with the mass production and widespread use of pesticides. Some of the currently used pesticides can be biodegraded into harmless substances in a relatively short period of time, while some organochlorine pesticides are difficult to degrade and are pesticides with strong residues. Vegetable pesticide residues exceeding the standard will directly endanger the nervous system, liver, kidney and other vital or...

Claims

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Application Information

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IPC IPC(8): G01N30/06
Inventor 刘磊邵辉李辉李娜张玉婷郭永泽
Owner CENT LAB TIANJIN ACADEMY OF AGRI SCI