Method for simultaneously measuring residue contents of five weedicides with different structures in soil
A herbicide and residue technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of large consumption of organic solvents, long analysis time, high detection limit, etc., to achieve optimized detection conditions, simple processing procedures, and reduced use volume effect
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[0047] The present invention simultaneously measures three types of herbicides with five different structures in soil: metsulfuron-methyl (sulfonylureas), bensulfuron-methyl (sulfonylureas), promethazin (triazines), atrazine (triazines) Azines) and the method for quinclorac (quinoline carboxylic acids) residual amount may further comprise the steps:
[0048] (1), weighing samples: accurately weigh 10.0 g of air-dried soil samples passed through a 250 μm sieve, and place them in a 50 mL plastic centrifuge tube;
[0049] (2) Acetonitrile extraction: add 20.0 mL of acetonitrile mixed solution containing 5% acetic acid, vortex for 2 min, add 1.0 g of sodium chloride and 4.0 g of anhydrous magnesium sulfate, immediately shake for 30 s, and centrifuge at 4000 r / min for 5 min;
[0050] (3) Solid-phase extraction: 5.0 mL of the supernatant was transferred to a centrifuge tube containing 0.0750 g of C18 and 1.0 g of anhydrous magnesium sulfate, vortexed for 30 s, centrifuged at 4000 r / ...
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