A method for determining the residual content of hymexazol pesticides
A hamexamol and triple quadrupole technology, which is applied in the field of pesticide detection, can solve the problems of reducing the detection accuracy, unable to accurately determine the content of hamexamol pesticide residues, and difficult to meet the accuracy requirements of hamexamol pesticide residues.
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Embodiment 1
[0089] Example 1: Detection of Hymexazol Pesticide Residues in Tobacco Samples
[0090] 1) Sample extraction steps:
[0091] Weigh about 2g (accurate to 0.1mg) of Burley tobacco into a 50mL capped centrifuge tube and add 10mL of water, oscillate until the sample is fully infiltrated by water, let stand for 10min; pipette 10mL of acetone into the centrifuge tube, and place Shake at 2000r / min for 2min on a vortex mixer; store the centrifuge tube in the freezer (-18°C) for 10min and then take it out. Add 4g of anhydrous magnesium sulfate, 1g of sodium chloride, 1g of sodium citrate, and 0.5g of disodium hydrogen citrate into the centrifuge tube, and immediately oscillate on a vortex mixer at a speed of 2000r / min for 2min to prevent anhydrous sulfuric acid Magnesium reacts with water to cause local overheating and agglomeration, and then centrifuge at 4000r / min for 5min. Pipette 1.5 mL of the supernatant of the extract into a 2 mL centrifuge tube, add 150 mg of anhydrous magne...
Embodiment 2
[0103] Example 2: Detection of Hymexazol Pesticide Residues in Vegetable Samples
[0104] 1) The extraction steps of the sample: with embodiment 1.
[0105] 2) Sample detection steps:
[0106] High-performance liquid chromatography-triple quadrupole mass spectrometer (Agilent 1290 high performance liquid chromatograph from Agilent Company of the United States and API5500 triple quadrupole tandem mass spectrometer from AB SCIEX Company of the United States) was used to detect samples, and the determination conditions were as follows: :
[0107] Chromatographic conditions: injection volume: 25 μL, chromatographic column: Agilent ZORBAX ultra-high pressure rapid high resolution 300SB-C8 (specification: 2.1×100 mm, 1.8 μm), ethanol-water elution program: 0 to 3.5 minutes, ethanol and water The volume ratio of ethanol and water is 5:5, 3.5 to 15 minutes, the volume ratio of ethanol and water is 8:1, the flow rate is 300 μL / min, and the column temperature is 40°C.
[0108] Mass...
Embodiment 3
[0115] Example 3: Detection of Hymexazol Pesticide Residues in Tea Samples
[0116] 1) The extraction steps of the sample: with embodiment 1.
[0117] 2) Sample detection steps:
[0118] High-performance liquid chromatography-triple quadrupole mass spectrometer (Agilent 1290 high performance liquid chromatograph from Agilent Company of the United States and API5500 triple quadrupole tandem mass spectrometer from AB SCIEX Company of the United States) was used to detect samples, and the determination conditions were as follows: :
[0119] Chromatographic conditions: injection volume: 50 μL, chromatographic column: Agilent ZORBAX ultra-high pressure rapid high resolution 300SB-C8 (specification: 2.1×100mm, 1.8 μm), ethanol-water elution program: 0 to 3 minutes, ethanol and water The volume ratio is 4:6, 3 to 5 minutes, the volume ratio of ethanol and water is 8.5:1, the flow rate is 400 μL / min, and the column temperature is 50°C.
[0120] Mass spectrometry conditions: atomi...
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