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Fast test method of pyrethroid pesticide residue containing cyan

A technology for pyrethroids and pesticide residues, applied in the application field of rapid food detection, can solve the problems of low cost, long detection cycle, cumbersome pre-treatment operations, etc., and achieve the effect of simple and fast operation, economical and applicable, and novel ideas

Inactive Publication Date: 2010-10-20
桑华春
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Such existing methods require the use of expensive instruments, pretreatment operations are also very cumbersome, and the detection cycle is very long. It is impossible to achieve fast, low-cost, and easy-to-use on-site detection.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Cut the Chinese cabbage sample into pieces about 1cm square, weigh 10g and place it in a 100mL Erlenmeyer flask or beaker, add 20mL extraction solvent to extract for 10 minutes, stir several times from time to time during the extraction process, and transfer the extraction solution to a 100mL suction filter bottle , wash the residue twice with distilled water, 5 mL each time, and transfer all the solution to a suction filter flask.

[0022] Weigh 2g of solid reagent into the filter bottle, connect the leather tube of the filter bottle to the glass tube, connect the 50mL separatory funnel to the filter bottle, plug it tightly, close the separatory funnel, and insert the tip of the glass tube into the receiver tube bottom. Add 6 mL of reagent two to the separatory funnel. Slowly add dropwise until no gas is generated, then place it for 1 minute, then remove the glass tube.

[0023] Add 2 mL of Reagent 3 to the receiving tube, mix well, quickly add 3 drops of Reagent 4, ...

Embodiment 2

[0025] Cut the cucumber sample into cubes of about 1 cm, weigh 10 g and place it in a 100 mL Erlenmeyer flask or beaker, add 20 mL of extraction solvent to extract for 10 minutes, stir several times, and transfer the extraction solution to a suction filter bottle.

[0026] Weigh 2.0g of solid reagent into the suction filter bottle, according to the above device, slowly add reagent 2 drop by drop until no gas is generated, then place it for 1 minute, then remove the receiving tube. Add reagent 3 to the tube, mix well, quickly add 3 drops of reagent 4, immediately cover the stopper, mix well, let stand for 2 minutes, then add 2.4mL reagent 5, mix well, and place in a 30°C water bath for 10 minutes to develop color. Observe the color of the solution in the receiving tube from above.

Embodiment 3

[0028] Cut the apple sample into diced pieces about 1cm in size, weigh 10g and place it in a 100mL beaker, add 20mL extraction solvent to extract for 10 minutes, stir several times from time to time during the extraction process, transfer the extraction solution to a 100mL suction filter bottle, and use Wash the residue twice with distilled water, 5 mL each time, and transfer all the solution to a suction filter flask.

[0029] Weigh 2.0g of solid reagent into the suction filter bottle, connect the 50mL separatory funnel to the filter bottle, stopper tightly, close the separatory funnel, and insert the tip of the glass tube into the bottom of the receiving tube. Gently shake the suction filter bottle, and add 6mL of reagent 2 to the separatory funnel. Slowly add dropwise (about 4-5 seconds to plant a drop), leave it for 1 minute after no gas is generated, and remove the receiving tube. Add 2 mL of Reagent 3 to the receiving tube, mix well, quickly add 3 drops of Reagent 4, im...

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Abstract

The invention relates to a fast test method of pyrethroid pesticide residue containing cyan, which is characterized in that: after extracting solvent, decomposing pyrethroid pesticide containing cyan into a compound containing cyanogen; releasing the compound with gas in a gas producing device, absorbing with absorbing solvent, reacting with color reagent so that the solution turns blue; the higher the content of deltamethrin pesticide, the blue color is darker; and after directly colorating the trace deltamethrin pesticide containing cyan, and realizing the fast testing to the pyrethroid pesticide residue containing cyan in the product by comparing with a 'colourimetric card of pyrethroid pesticide residue containing cyan'. The invention carries out qualitative and semi-quantitative testing to the pyrethroid pesticide residue containing cyan through the standard colourimetric card, has the advantages of convenient and fast operation steps and low cost, and is easy to use in on-site fast testing equipment.

Description

technical field [0001] The invention relates to a rapid detection method for cyano-containing pyrethroid pesticide residues, in particular to a method capable of on-site and rapid detection of cyano-containing pyrethroid pesticide residues in food and environmental pollutants, and the method is used in Application in rapid detection of vegetables, fruits and other foods. Background technique [0002] Pyrethroid pesticides have the characteristics of strong knockdown power, fast insecticidal effect, broad spectrum, easy degradation, low toxicity to higher animals and birds, safe use, and little environmental pollution. They are widely used in tea gardens, orchards, Pest control work in farmland and other places. Cyanide-containing pyrethroid pesticides are especially widely used in vegetable and fruit cultivation, and the problems of pesticide residues caused by them are also relatively common. [0003] In the food hygiene industry, food safety problems caused by pyrethroid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/22
Inventor 桑华春叶升锋谢艳红
Owner 桑华春
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