Sensors for the detection of dithiocarbamate pesticides
A dithiocarbamic acid and sensor technology, which is used in material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, can solve the problems of poor accuracy and repeatability, high detection cost, and instrumentation. Expensive and other issues, to achieve the effect of easy portability, high selectivity, and improved detection sensitivity
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Embodiment 1
[0021] Weigh 4 mg of neo-cuprous reagent and 8 mg of CuCl2∙5H2O in 1 mL of silica gel sol-gel solution (tetraethoxysilane: ethylene glycol methyl ether: propylene glycol methyl ether acetate: chloroform: 0.5 M hydrochloric acid: qula Mix X-100:water at a volume ratio of 1:4:2:0.8:0.5:0.02:0.7, hydrolyze at 60°C for 5 hours to obtain a silica gel sol-gel solution), dissolve with ultrasound, and then pipette 1µL of the above The solution was drip-coated on a porous filter paper with a pore size of 0.22 μm, and dried at room temperature under the protection of nitrogen to prepare a dithiocarbamate pesticide sensor. 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 e...
Embodiment 2
[0023] 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 was initially dropped on the sensor, the color change was weak, and as the volume of the pesticide added continued to increase, the color change of the sensor gradually became more obvious, indicating that through enrichment, it can The detection sensitivity of the sensor is greatly improved. 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 0.25 g / L datamon stock solution to 0.25, 0.50, 0.75, 1.00, 1.25 mg / L with pH=7 ammonium acetate buffer solution. Take 200 µL of the above dilutions and add them dropwise to the sensor. After the solution is blotted dry by the abs...
Embodiment 3
[0025] 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. Dilute the 0.25 g / L zinc zinc stock solution to 0.5, 1.0, 1.5, 2.0, 2.5 mg / L respectively with ammonium acetate buffer solution at pH=7. 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 the pre-reaction image. Collect the sensors of zinc solutions of various concentrations as the post-reaction images, 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 of each channel values △R, △G, △B, and then use the formula Calc...
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