scott asked in 科學化學 · 10 years ago

甚麼是Luke Method...





1 Answer

  • Yy
    Lv 7
    10 years ago
    Favorite Answer


    1. Blend 100 g sample with 200 mL acetone and filter

    2. 50 mL extracted with 100 mL CH2Cl2/pet ether

    3. Repeat 2 times with 50 mL CH2Cl2 after addition of NaCl

    4. Organic layer diluted to 240 mL with acetone

    5. 2-120 mL portions split and concentrated—OC and OP

    6. OP: solvent exchanged to 5 mL acetone—GC-NPD

    7. OC: florisil column cleanup (several steps!)

    8. OC: solvent exchanged to 5 mL iso-octane—GC-ECD

    Note: 5:1 conc. factor or app. 1.7 g/mL sample equiv.

    Luke M, Froberg JE, Masumoto HT (1975) Extraction and cleanup of

    organochlorine, organophosphate, organonitrogen and hydrocarbon

    pesticides in produce for determination by gas-liquid chromatography. J

    Assoc Off Anal Chem 58:1020-1026

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