Convergence chromatography analytical method for residue of herbicides in tobacco
A technology of convergence chromatography and analysis method, which is applied in the direction of analyzing materials, material separation, measuring devices, etc., can solve the problems of endangering the health of people around, emitting into the surrounding air, and entering into the surrounding air, so as to reduce environmental pollution, reduce analysis costs, The effect of using less organic solvent
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example 1
[0032] American Waters Convergence Chromatography (UPC 2 ), Swiss Mettler AE 163 electronic balance (sensitivity: 0.0001g); American Labnet VtexMixer VX200 oscillator; German Sigma high-speed refrigerated centrifuge.
[0033] 2. Sample handling:
[0034] To analyze a certain burley tobacco sample, first extract the sample: Weigh 2.0 g of crushed tobacco sample into a 50 mL centrifuge tube with stopper, add 10 mL of water to infiltrate the sample, and let it stand for 10 min. Take 10 mL of acetonitrile into a centrifuge tube, oscillate on a vortex mixer at 2000 rpm for 1 min, and put the centrifuge tube into a -20°C refrigerator for 10 min. Then add the salting-out reagent package (containing 4 g anhydrous magnesium sulfate, 1 g sodium chloride, 1 g sodium citrate and 0.5 g disodium hydrogen citrate) to the centrifuge tube, and immediately vibrate at 2000 rpm on the vortex mixer 2 min, centrifuged at 5000 rpm for 3 min. Concentrate 5 mL of the supernatant to 1 mL by blowing...
example 2
[0048] Alachlor Dibenzamide Clomazone quizalofop-ethyl Napropamide metolachlor 0.116 — — 0.064 — 1.2
[0049] Note: "—" means not detected
[0050] Example 3: Select sample C (a finished cigarette), disassemble the cigarette, collect the shredded tobacco, and pulverize it. Other operations are as described in Example 1. The contents of the six pesticide targets in the sample are shown in Table 5.
[0051] Table 5 Test results of actual samples (unit: mg / kg)
example 3
[0052] Alachlor Dibenzamide Clomazone quizalofop-ethyl Napropamide metolachlor — — — — — 0.522
[0053] Note: "—" means not detected
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