STP573: Guidelines for Quantitative Liquid-Liquid Extraction of Organophosphate Pesticides from Water

    Suffet, IH
    Associate professor of Chemistry and Environmental Science; research assistant, Environmental Engineering and Science; and research assistant, Department of Chemistryproject environmental engineer, Drexel UniversityMcFarland-Johnson-Gibbons Engineers, Inc., PhiladelphiaWoodbury, Pa.N.J.

    Wu, C
    Associate professor of Chemistry and Environmental Science; research assistant, Environmental Engineering and Science; and research assistant, Department of Chemistryproject environmental engineer, Drexel UniversityMcFarland-Johnson-Gibbons Engineers, Inc., PhiladelphiaWoodbury, Pa.N.J.

    Wong, DTL
    Associate professor of Chemistry and Environmental Science; research assistant, Environmental Engineering and Science; and research assistant, Department of Chemistryproject environmental engineer, Drexel UniversityMcFarland-Johnson-Gibbons Engineers, Inc., PhiladelphiaWoodbury, Pa.N.J.

    Pages: 16    Published: Jan 1975


    Abstract

    A systematic approach for the development of quantitative analysis of organophosphate pesticides from water is presented. Information is presented on the different steps of aqueous pesticide residue analysis including liquid-liquid extraction, water and solvent phase separation, solvent drying, and a two-step evaporation of the extract which permits solvent volume reduction to 0.5 ml for recovery at low levels.

    The p-value method of approach is used as a guide to optimize the liquid-liquid extraction step. The p-value determined in water is shown to be applicable to other types of water including river water, sea water, and secondary sewage effluent. Recovery studies are presented at nanogram/liter concentrations where the solvent evaporation procedure is shown to be critical.

    Keywords:

    water quality, pesticides, environmental tests, organophosphates, recovery, extraction


    Paper ID: STP39008S

    Committee/Subcommittee: D19.95

    DOI: 10.1520/STP39008S


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