Method for detecting residual organic solvents in soil and water by adopting gas chromatography-mass spectrometry method
A gas chromatography and organic solvent technology, used in pesticide adjuvant residue detection, drug detection, and environmental safety fields, can solve the problems of different chemical properties, high promotion costs, large differences in boiling points and polarities, etc., and achieves easy operation and operation. Convenience and increased sensitivity
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Examples
Embodiment 1
[0043] S11. Instruments and reagents
[0044] 7890A / 5975C gas chromatography-mass spectrometry (Agilent, USA); XS 105 electronic balance (Mettler Toledo, Switzerland); QL-901 vortex mixer (Qilin Bell Instrument Co., Ltd., Haimen City); BiofugeStratos desktop high-speed freezer Centrifuge (Thermo Company, USA).
[0045] Acetonitrile, ethyl acetate, toluene, acetone, DMF, DMSO (chromatographically pure, Merck, Germany); o-xylene, m-xylene, p-xylene (chromatographic standard, Sinopharm Chemical Reagent Beijing Co., Ltd.); Wahaha drinking Purified water (Wahaha Group); other reagents were of analytical grade, purchased from Beijing Baihui Jiaxing Technology Co., Ltd.
[0046] Soil and water samples were collected from farmlands around Yanjiao.
[0047] S12, standard solution preparation
[0048] Acetonitrile, ethyl acetate, and acetone are formulated into an extract with a volume ratio of 1:1.2:1.2;
[0049] Toluene, o-xylene, p-xylene, m-xylene, DMF and DMSO are prepared with...
Embodiment 2
[0064] S21. Instruments and reagents
[0065] Same as S11.
[0066] S22. Standard solution preparation
[0067] Acetonitrile, ethyl acetate, and acetone are made into an extract with a volume ratio of 1:1.2:2;
[0068] Toluene, o-xylene, p-xylene, m-xylene, DMF and DMSO are prepared with extracts at a concentration of 2.0×10 4 6 standard stock solutions of mg / L. Then use the extract to make the concentration of benzene series, DMF, and DMSO respectively 2.0×10 2 mg / L, 1.0×10 3 mg / L, 2.0×10 3 mg / L mixed standard working solution.
[0069] S23, sample pretreatment
[0070] S23.1. Soil sample pretreatment
[0071] Weigh the homogenized soil and add water and extract mixed solution successively according to the solid-to-liquid ratio of 1g: 0.25mL: 2.25mL and mix well, add anhydrous Na 2 SO 4 and mix well, after standing still, centrifuge to get the supernatant and filter to obtain the soil extract.
[0072] Take 2mL soil extract and add anhydrous MgSO 4 , 0.2μm membran...
Embodiment 3
[0081] S31. Instruments and reagents
[0082] Same as S11.
[0083] S32. Standard solution preparation
[0084] Acetonitrile, ethyl acetate, and acetone are formulated into an extract with a volume ratio of 1:1.2:0.5;
[0085] Toluene, o-xylene, p-xylene, m-xylene, DMF and DMSO are prepared with extracts at a concentration of 2.0×10 4 6 standard stock solutions of mg / L. Then use the extract to make the concentration of benzene series, DMF, and DMSO respectively 2.0×10 2 mg / L, 1.0×10 3 mg / L, 2.0×10 3 mg / L mixed standard working solution.
[0086] S33, sample pretreatment
[0087] S33.1. Pretreatment of soil samples
[0088] Weigh the homogenized soil and add water and extract mixed solution successively according to the solid-to-liquid ratio of 1g: 0.25mL: 0.75mL and mix well, add anhydrous Na 2 SO 4 and mix well, after standing still, centrifuge to get the supernatant and filter to obtain the soil extract.
[0089] Take 2mL soil extract and add anhydrous MgSO 4 , 0.2...
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Abstract
Description
Claims
Application Information
- IPC
- G01N30/02; G01N30/72
- CPC
- G01N30/02; G01N30/7206
- Inventors
- 王珊珊; 王静