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2. 2. U. S. EPA, “Determination of Pesticides and Polychlorinated Biphenyls in Ambient Air Using High Volume Polyurethane Foam (PUF) Sampling Followed by Gas Chromatographic/Multi-Detector Detection (GC/MD) (TO-4)”, 1984.
3. 3. U. S. EPA, “Determination Of Pesticides And Polychlorinated Biphenyls In Ambient Air Using Low Volume Polyurethane Foam (PUF) Sampling Followed By Gas Chromatographic/Multi-Detector Detection (GC/MD) (TO-10)”, 1989.
4. Simultaneous determination of trace pesticides in urban air