Method for measuring pesticide residue of six kinds of dinitroaniline in tobacco and tobacco products
A technology for pesticide residues and dinitroaniline, which is applied to measuring devices, instruments, scientific instruments, etc., can solve the problems of complicated operation steps and high toxicity, and achieve the effects of shortening the pre-extraction treatment time, easy operation and reducing pollution.
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example 1
[0031] 1. Instruments and reagents:
[0032] Pesticides: buddingin, flumetriamine, propramid, pendimethalin, butafluralin and trifluralin, internal standard: mirex, all standard; anhydrous Na 2 SO 4 , analytically pure; n-hexane (pesticide residue grade); Florisil (Florisil, 60 mesh-100 mesh, pesticide residue grade).
[0033] Agilent 6890N gas chromatograph equipped with ECD detector; ASE-200 accelerated solvent extractor (Dionex, USA); AE 163 electronic balance (sensitivity: 0.0001g) and AE166 electronic balance (sensitivity: 0.01g) (Swiss Mettler company).
[0034] 2. Sample processing:
[0035] Anhydrous sodium sulfate: Bake in a muffle furnace at 550°C for 4 hours before use.
[0036] Florisil: Burn Florisil in a muffle furnace at 550°C for 5h, cool it in a desiccator without desiccant, add 5% (mass fraction) of water, mix well, and place in a closed Equilibrate in a glass container for at least 48h.
[0037] Accurately weigh 5g of tobacco powder (accurate to 0.01g)...
example 2
[0043] As described in Example 1, another tobacco leaf sample was selected, and the residual amounts of protopazin and flumethamine in the sample were measured to be 0.86 μg / g and 0.13 μg / g, respectively.
example 3
[0045] As described in Example 1, another tobacco leaf sample was selected, and the residual amounts of propamethalin and pendimethalin in the sample were measured to be 0.77 μg / g and 4.02 μg / g, respectively.
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