LC-MS/MS (liquid chromatography-mass spectrometry/mass spectrometry) method for analyzing residual quantity of phenoxy carboxylic acid herbicides in tobaccos
A phenoxycarboxylic acid and LC-MS technology, which is applied to the analysis of materials, measurement devices, and material separation, can solve the problems of underestimating the actual concentration, etc., and achieve the effects of reducing matrix effects, improving accuracy, and operating accurately
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example 1
[0037] 1. Instruments and reagents:
[0038] Standards of 2,4,5-T, 2,4-D, dicamba and their methyl ester derivatives were purchased from Dr. Eh laboratory in Germany; deuterated 2,4,5-T, deuterated 2,4- D and deuterated dicamba standard products were purchased from Canadian CDN company.
[0039] Methanol (Pesticide Residue Grade, DUKSAN Company, South Korea); Dichloromethane (Pesticide Residue Grade, J. T. Baker Company, USA); Glacial Acetic Acid (HPLC Grade, TEDIA Company, USA); C18 (Agilent Company, USA); Anhydrous Magnesium Sulfate (Tianjin Kemiou Chemical Reagent Co., Ltd.), should be burned at 650 ℃ for 4 h before use, and stored in a desiccator for later use; sodium hydroxide (Tianjin Chemical Reagent No. 3 Factory); concentrated sulfuric acid (Luoyang Haohua Chemical Reagent Co., Ltd.) .
[0040] Liquid chromatography-tandem mass spectrometry (API 4000, American AB Company); desktop high-speed refrigerated centrifuge (3-30k, American SIGMA Company); vortex oscillator...
example 2
[0057] As described in Example 1, another tobacco sample B was selected, and the measured contents of the three pesticide targets in the sample are shown in Table 4.
[0058] Table 4 Detection results of pesticide targets in sample B
[0059] serial number Chinese common name Content of pesticide target in the sample (mg / kg) 1 2,4,5-T 0.16 2 2,4-D not detected 3 Dicamba not detected
example 3
[0061] As described in Example 1, another tobacco sample C was selected, and the measured contents of the three pesticide targets in the sample are shown in Table 5.
[0062] table 5 Detection results of pesticide targets in sample C
[0063] serial number Chinese common name Content of pesticide target in the sample (mg / kg) 1 2,4,5-T not detected 2 2,4-D 0.34 3 Dicamba not detected
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