GC-EI-MS (Gas Chromatography-Electron Ionization-Mass Spectrum) detecting method for residual quantity of cyenopyrafen in fruits and vegetables
A technology of GC-EI-MS and fenpyroximate, which is applied to the determination of pesticide residues, can solve the problems of restricting the application of LC-MS/MS, long time consumption, high price, etc., to avoid matrix interference and easy to operate. , the effect of high sensitivity
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Embodiment 1
[0034] Embodiment 1: the detection of the residual amount of pyraclofen in oranges
[0035] (1) Sample pretreatment
[0036]Weigh 10.0 g of well-mixed oranges into a 50 mL centrifuge tube, accurately add 20 mL of acetonitrile, extract homogeneously for 1 min, add 3 g of anhydrous magnesium sulfate and 2 g of sodium chloride, vortex for 1 min, and centrifuge at 7000 r / min for 5 min. After centrifugation, take 6mL of acetonitrile extract and transfer to a solution containing 900mg anhydrous magnesium sulfate, 300mg C 18 and 150mg PSA in a centrifuge tube, vortex for 1min, and centrifuge at 5000r / min for 5min. Take 4mL of supernatant in a nitrogen blowpipe, dry it with nitrogen at 40°C, add 1mL of acetone / n-hexane mixed solvent with a volume ratio of 1 / 1 to dissolve the residue, vortex and mix evenly to pass through the membrane, then transfer it to an injection bottle for GC - EI-MS determination.
[0037] (2) Preparation of standard working solution
[0038] Dilute the 100n...
Embodiment 2
[0063] Embodiment 2: Detection of the residual amount of pyrazafen in dehydrated green peppers
[0064] (1) Sample pretreatment
[0065] Weigh 2.0 g of fully mixed dehydrated green peppers into a 50 mL centrifuge tube, add 5 mL of water for resuscitation for 30 min, accurately add 20 mL of acetonitrile solution containing 1% acetic acid, extract homogeneously for 1 min, add 3 g of anhydrous magnesium sulfate, 2 g of sodium acetate and 2mL of water, vortexed for 1min, centrifuged at 7000r / min for 5min. After centrifugation, take 6mL of acetonitrile extract and transfer to a solution containing 900mg anhydrous magnesium sulfate, 300mg C 18 and 150mg PSA in a centrifuge tube, vortex for 1min, and centrifuge at 5000r / min for 5min. Take 4mL of the supernatant in a nitrogen blowpipe, dry it with nitrogen at 40°C, add acetone / n-hexane mixed solvent with a volume ratio of 1 / 1 to dissolve the residue, vortex and mix well, then transfer it to an injection bottle for GC-EI - MS determ...
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