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A kind of rapid inspection card containing cyanopyrethroid pesticides and preparation and application

A technology for pyrethroids and cards, which is applied in the field of preparation of quick test cards for cyano-pyrethroid pesticides, can solve the problems of inconspicuous color development, complicated technology, unsafety, etc., and achieves simple preparation and low price , the effect of convenient operation

Active Publication Date: 2018-07-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the immunoassay method requires the preparation of corresponding antibodies against each cyano-containing pyrethroid pesticide, which is complex and costly; the chemical chromogenic method usually uses the cyano group in the pesticide to be hydrolyzed and then added concentrated acid to make it change. It is not environmentally friendly, unsafe, and the color development phenomenon is not obvious

Method used

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  • A kind of rapid inspection card containing cyanopyrethroid pesticides and preparation and application
  • A kind of rapid inspection card containing cyanopyrethroid pesticides and preparation and application
  • A kind of rapid inspection card containing cyanopyrethroid pesticides and preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Preparation of quick test card for silica gel plates containing cyano-pyrethroid pesticides: Weigh 30 mg of p-cyanobenzaldehyde in 1 mL of polymer B (polyvinyl butyral, polyethylene glycol-400, trioctyl phosphate and ethanol Stir at room temperature for 2 hours at a ratio of 1:2:5:100 to obtain polymer B), dissolve it in ultrasonic, then use a pipette gun to absorb 3 μL of the above solution, and drop-coat it on a silica gel plate card to prepare a cyano-containing pyrethroid Quick check card for ester pesticides.

Embodiment 2

[0033] Preparation of cyano-pyrethroid-containing pesticide paper-based quick check card: Weigh 50 mg of p-nitrobenzaldehyde in 1 mL of silica gel sol-gel solution A (tetraethoxysilane: ethylene glycol methyl ether: propylene glycol methyl ether acetate : Chloroform: 1M HCl: Span 60: Water mixed at a volume ratio of 1:3:3:0.5:0.4:0.005:1, hydrolyzed at 60°C for 5 hours to obtain silica gel sol-gel solution A), dissolved by ultrasonication, Then use a pipette gun to draw 1 μL of the above solution, and drop-coat it on a paper-based card to prepare a quick test card for cyano-pyrethroid-containing pesticides.

Embodiment 3

[0035] Investigate the color change over time of the quick test card prepared in Example 1 during the detection of cyano-containing pyrethroid pesticides. Taking lambda-cyhalothrin as a representative, prepare 1 mL of lambda-cyhalothrin aqueous solution with a concentration of 2 ppm. To this solution, add 50 μ L concentration of 0.5M sodium hydroxide solution (solvent is 60% ethanol aqueous solution), then add 0.5mL concentration of 0.2M chlorinated triphenyltetrazolium solution (solvent is water), mix Leave it for 5min. Take 10 μL of the above solution and drop it in the center of the indicator immobilized on the card, use the camera function of the mobile phone to record the color change of the indicator over time, and take pictures of the quick check card at 0, 5, 10, and 20 minutes respectively, as shown in figure 1 shown. With the prolongation of the reaction time, the color of the card gradually deepened, and an obvious color change could be seen in 10 minutes. In orde...

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Abstract

The invention relates to a quick inspection card for cyano-pyrethroid pesticides. This quick test card is based on the principle of chemical color development. The cyano group in the pesticide is subjected to alkaline hydrolysis to generate cyanide ions, and then the subsequent color development is performed directly. There is no need to convert the cyano group into highly toxic hydrocyanic acid gas, and the operation is simple and safe. Environmental friendly. Since the cyanide ion acts as a catalyst in the color reaction, the degree of color development deepens with the prolongation of the reaction time, and it can detect cyano-containing pyrethroid pesticides with a concentration as low as the national standard limit, with high sensitivity. In addition, the quick check card also has high selectivity. By immobilizing the indicator, the prepared quick test card has the characteristics of simple operation, easy storage, and easy portability, and can be popularized and used.

Description

technical field [0001] The invention belongs to the technical field of rapid detection of pyrethroid pesticides. It specifically relates to the preparation and specific application of a cyano-pyrethroid-containing pesticide quick-check card based on the principle of chemical color development. Background technique [0002] Pyrethroid pesticides are a class of insecticides that simulate natural pyrethrins and are artificially synthesized. Compared with the other three categories of pesticides, namely organophosphorus, carbamate and organochlorine pesticides, pyrethroid pesticides have the advantages of high efficiency and low toxicity, and have been widely promoted and used. In particular, cyano-containing pyrethroid pesticides are more widely used in fruit and vegetable cultivation. Scientific research has shown that the toxicity of cyano-pyrethroid pesticides is cumulative, and long-term use will cause poisoning events. In addition, these pesticides are also considered a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 冯亮张雨王昱
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI