Acetamiprid detection device and method for detecting acetamiprid
A detection device, the technology of acetamiprid, which is applied in the field of chemical analysis, can solve the problems that the detection method cannot be visualized, and achieve the effects of high selectivity, simple preparation method and high sensitivity
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[0046] The preparation process of the ionic liquid polymer-coated glass capillary: the two ends of the glass capillary are burnt and sealed. Then wash with distilled water and immerse in silver ammonium ion solution (concentration range 2%-5%), form microstructure silver layer by silver mirror reaction, the length of silver layer is about 0.8mm;
[0047] After drying at room temperature, immerse in ethanol solution of 1,8-octanedithiol (10-30mmol·L -1 ) for 12h to form a self-assembled monolayer dithiol;
[0048] Then, immerse the end of the glass capillary obtained in the previous step into a solution containing 0.1-0.3g VOIm + NapSO 3 - and 0.002-0.004g azobisisobutyronitrile in 30mL chloroform solution; after purging with nitrogen for 10 minutes, under nitrogen atmosphere, the system was reacted at 50-100°C for 12-24h; the ionic liquid was on the surface of the glass capillary In situ polymerization forms positively charged ionic liquid polymers; the surface coating of ...
Embodiment 2
[0057] An acetamiprid detection device for specifically recognizing and detecting acetamiprid, the steps are as follows:
[0058] 1. Preparation of positively charged ionic liquid polymer modified glass capillary
[0059] (1) Ionic liquid polymer VOIm + NapSO 3 - preparation of
[0060] The aqueous solution of 1-vinyl-3-octyl imidazolium bromide and β-naphthalene sulfonate sodium with a charge ratio of 1:1 was mixed and stirred overnight at room temperature; after the reaction, the hydrophobic target VOIm + NapSO 3 - Precipitate from aqueous solution;
[0061] An equal volume of chloroform was added to the above aqueous mixture to extract the target; after the layers were separated, the chloroform was separated and washed several times with fresh deionized water (1:1, v / v) to remove Br in the product - , until no Br was detected in the aqueous phase - ;
[0062] Then, the chloroform layer was collected and removed by vacuum distillation; the resulting product was puri...
Embodiment 3
[0070] Detection of acetamiprid
[0071] Prepare a series of acetamiprid standard solutions (0.05-2.0 mg / L concentration), and then insert the glass capillary into the acetamiprid solution for 10 minutes. Take it out, and observe the fluorescence intensity under ultraviolet light, such as Figure 4 , using matlab software to convert the brightness value of the picture into a gray value, and obtain a linear regression curve ( Figure 5 ), the linear equation is y=131.82x+22.08, wherein, x is the concentration (mg / L), and y is the fluorescence intensity, according to the calculation formula LOD=3N / S (N is the gray value of blank sample, S is the slope of the calibration curve), and the detection limit of acetamiprid is 0.02mg / L.
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