Method for detecting content of chlorpyrifos in vegetables based on Cu-ZrMOF multi-mode signals
A signal detection, chlorpyrifos technology, applied in the direction of measuring devices, chemical instruments and methods, biological testing, etc., can solve the problems of inability to distinguish and detect organophosphorus pesticides, poor selectivity, sensitivity and accuracy, and affect sensor sensitivity and stability.
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[0050] A method for detecting chlorpyrifos content in vegetables based on Cu-ZrMOF multi-mode signal, comprising the steps of:
[0051] (1) Synthesis of Cu-ZrMOF nanozyme materials with certain morphology characteristics;
[0052] Disperse 80 mg of 2,2'-bipyridine-5,5'-dicarboxylic acid in 6 mL of dimethylformamide (DMF), and sonicate;
[0053] 26.12 mg of ZrCl 4 Dissolve in 12 mL DMF, sonicate;
[0054] Then the two solutions were mixed in the reactor, 1.5 mL of acetic acid was added and sonicated, then the solution was stirred and heated at 120 °C for 16 h, a white solid was obtained by centrifugation, and washed three times with ethanol to obtain ZrMOF;
[0055] In a round-bottomed flask, 30 mg of the obtained ZrMOF was dissolved in 5 mL of THF, and after sonication, 10 mg of CuCl was added to the solution 2 • 2H 2 O, sonicated, then stirred for 2 h;
[0056] Finally, the green solid Cu-ZrMOF was collected by centrifugation and washed three times with ethanol, redisper...
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[0071] Experimental example: detection of vegetable samples: Weigh 5.0 g of lettuce and 5.0 g of lettuce and grind them into 5 mL centrifuge tubes, add 5 mL of PB (10 mM, pH 7.4) solution, then centrifuge and take out the supernatant . The supernatant of each sample was spiked with chlorpyrifos standard solution to prepare three or four spiked samples with low, medium and high concentrations. Next, use electrochemical, fluorescence and colorimetric methods to detect the signal value produced by chlorpyrifos in lettuce and lettuce samples, and substitute it into the working curve to obtain the content of chlorpyrifos in vegetable samples and the recovery rate of the standard, as shown in Table 1, Table 2 and Table 1. Three shown:
[0072] Table 1 Experimental results of detection of chlorpyrifos in spiked vegetable samples by electrochemical method
[0073] .
[0074] Table 2 Experimental results of detection of chlorpyrifos in spiked vegetable samples by fluorescence meth...
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