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Sensor for detection of dithiocarbamate pesticides and preparation and application thereof

A technology of dithiocarbamic acid and sensors, which is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators on materials, etc., which can solve the problems of poor accuracy and repeatability, expensive instruments, and detection problems. Problems such as high cost, to achieve the effects of portability, improved detection sensitivity, and high selectivity

Active Publication Date: 2016-12-07
中科(大连)快检科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, gas chromatography and liquid chromatography have high accuracy, but the instruments are expensive, labor-intensive and time-consuming, the detection cost is high, and it is difficult to achieve rapid on-site detection
Spectrophotometry is usually based on the decomposition of dithiocarbamate pesticides into the irritating gas carbon disulfide under acidic heating conditions, and then detects carbon disulfide. This method has cumbersome steps, low sensitivity, and poor accuracy and repeatability.

Method used

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  • Sensor for detection of dithiocarbamate pesticides and preparation and application thereof
  • Sensor for detection of dithiocarbamate pesticides and preparation and application thereof
  • Sensor for detection of dithiocarbamate pesticides and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weigh 4mg neo-cuprous reagent and 8mgCuCl2 5H2O in 1mL silica gel sol gel A (tetraethoxysilane: ethylene glycol methyl ether: propylene glycol methyl ether acetate: chloroform: 0.5M hydrochloric acid: triton X- 100: water was mixed at a volume ratio of 1:4:2:0.8:0.5:0.02:0.7, hydrolyzed at 60°C for 5 hours to obtain silica gel sol-gel solution A), dissolved by ultrasonication, and then pipette 1 μL of the above solution, Dithiocarbamate pesticide sensors were prepared by drop-coating on porous filter paper with a pore size of 0.22 μm, and drying at room temperature under nitrogen protection. Firstly, the selectivity of the sensor to different kinds of pesticides was investigated. Images were recorded before and after the sensor reacted with the pesticide using a flatbed scanner. Digitalize the color of the image before and after the reaction with Photoshop software, extract the red, green and blue (RGB) channel values, and subtract the color values ​​of each channel be...

Embodiment 2

[0032] Taking dacenolon in the dithiocarbamate insecticides as a representative, investigate the enrichment effect of the sensor prepared in Example 1, the results are as follows figure 2(a) shown. It can be seen that when 20 μL of datamonon solution containing 1 mg / L is initially dropped on the sensor, the color change is weak, and as the volume of the added pesticide increases, the color change of the sensor is gradually obvious, indicating that through enrichment, the sensor can be greatly improved. The detection sensitivity of the sensor. In order to make the operation convenient and fast, 200 μL of pesticide solution was taken as the enrichment volume in the experiment of establishing the standard concentration curve. Dilute the 0.25g / L datamon stock solution to 0.25, 0.50, 0.75, 1.00, 1.25mg / L with pH=7 ammonium acetate buffer. Take 200 μL of the above dilutions and add them dropwise to the sensor. After the solution is blotted dry by the absorbent filter paper placed...

Embodiment 3

[0034] Taking zinc zinc in the dithiocarbamate fungicides as a representative, the standard curve of the sensor prepared in Example 1 for detecting zinc zinc was investigated. The 0.25g / L Zineb stock solution was diluted to 0.5, 1.0, 1.5, 2.0, 2.5mg / L with pH=7 ammonium acetate buffer solution respectively. Take 200 μL of the above dilutions and add them dropwise to the sensor. After the solution is blotted dry by the absorbent filter paper placed under the sensor, use a flatbed scanner to record the image. The sensor enriched with 200 μL of buffer solution is used as the pre-reaction image, and the enrichment of each The sensor of zinc zinc solution is the post-reaction image, digitize the pre-reaction and post-reaction images with Photoshop software, extract the red, green and blue (RGB) channel values, and subtract the color values ​​of each channel before and after the reaction to obtain the color change value of each channel△ R, △G, △B, and then use the formula Calculat...

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Abstract

The invention relates to a sensor used for highly-sensitive and rapid detection of dithiocarbamate pesticides and preparation and application thereof. According to the principle of the method, characteristic group C=S of a dithiocarbamate pesticide and an indicator rapidly undergo an oxidation-reduction reaction at normal temperature such that the indicator changes in color. Thus, the sensor has high sensitivity in the coexistence of various pesticides. In addition, there is a good linear relation between color change of the indicator and pesticide concentration. By immobilizing the indicator onto a porous material, low-concentration pesticides can continuously react with the indicator by an enrichment mode, thus greatly raising detection sensitivity. The detection limits of two pesticides dazomet and zineb both can meet the international and domestic standard requirements of the maximum residue limit of dithiocarbamate pesticides. The sensor is suitable for spot rapid detection of the pesticides.

Description

technical field [0001] The invention belongs to the technical field of detection of dithiocarbamate substances. In particular, it relates to a sensor for rapidly detecting dithiocarbamate pesticides with high sensitivity, that is, a method for rapidly and highly sensitively detecting carbamate pesticides through an enrichment colorimetric method. Background technique [0002] Dithiocarbamate pesticides mainly include insecticides such as Metron and Metabam, and fungicides such as Dyson and Fumei. Due to the characteristics of high efficiency, low toxicity, broad spectrum and low price, this kind of pesticide has become the leading product of pesticide use in the world. Among them, Daisen and Fumei fungicides can be used to prevent and control more than 400 pathogens of more than 70 kinds of crops, and are widely used in the prevention and control of diseases and insect pests of grain, vegetables, fruit trees, tobacco, etc. [0003] However, with the extensive use of dithio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 冯亮张雨
Owner 中科(大连)快检科技有限公司
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