Method for visualized detection of organophosphorus pesticide residue by doped quantum dot ratio fluorescence technique
An organophosphorus pesticide and ratio fluorescence technology, applied in the field of agrochemical analysis, can solve the problems of inability to distinguish between organophosphorus and carbamate pesticides, expensive instruments, difficult on-site detection, etc. Simple operation, avoid interference effect
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[0034] Example 1: Detection of chlorpyrifos and its degradation products
[0035] 1. Preparation of manganese-doped zinc sulfide quantum dots
[0036] First dissolve 50 mmol of zinc nitrate in 40 mL of deionized water, then take 0.5-7.5 mmol of manganese acetate and dissolve it in the above solution to do a series of manganese doping experiments to determine which amount has the highest luminescence yield. The above mixture was sonicated for 10 min to Completely dissolve, then reflux and pass dry nitrogen for more than 30min to remove oxygen in the solution. Dissolve 50 mmol of sodium sulfide in 10 mL of deionized water, add dropwise to the above boiling mixture, reflux and stir vigorously for 5 h. After cooling it was centrifuged, sonicated and washed three times with deionized water before redispersing in water. Fluorescence spectra see figure 1 .
[0037] 2. Quenching of double emission band fluorescence of doped quantum dots
[0038] Add 5 mL of manganese-doped zinc s...
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[0043] The detection of embodiment 2 methyl parathion
[0044] 1. Preparation of copper and manganese co-doped zinc sulfide quantum dots
[0045] First dissolve 50 mmol of zinc chloride in 40 mL of deionized water, and then take 0.5-7.5 mmol of manganese chloride and copper chloride to dissolve in the above solution to do a series of manganese parameter experiments to determine which amount has the highest luminescence yield. The above mixture was sonicated for 10 min to dissolve completely, then refluxed and passed through dry nitrogen for more than 30 min to remove oxygen from the solution. Dissolve 50 mmol of sodium sulfide in 10 mL of deionized water, add dropwise to the above boiling mixture, reflux and stir vigorously for 5 h. After cooling, centrifuge, ultrasonically disperse and wash three times with deionized water, and then re-disperse in water (concentration micrograms per milliliter) for use.
[0046] 2. Quenching of double emission band fluorescence of doped qua...
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