Identification of nanogram amounts of certain organochlorine insecticides

Analysis of polychlorinated biphenyls by gas chromatography and ultraviolet irradiation

“…When only one is present, the degradation pattern may be used to determine which one. There are no insecticide degradation peaks listed for heptachlor epoxide because the degradation products are not separated on this column (Kaufman et al, 1972).…”

“…A detector purge flow of the same gas at a rate of 60 ml/min was employed. The effluent splitting and trapping assemblies were the same as those described by Kaufman et al (1972). This system provides a means of trapping individual gas chromatographic peaks in a short length of Teflon tubing.…”

“…In this study an ultraviolet method for the identification of certain Cl's (Kaufman et al, 1972) was applied to the identification of PCB's alone and in the presence of Cl's. The method involved trapping the component as it eluted from the gas chromatograph, exposing it to laboratory ultraviolet (uv) light, and rechromatographing the resulting products.…”

Analytical methodology for bioactive compounds. Photochemically assisted analysis of chlorinated hydrocarbon pesticides in the presence of polychlorinated biphenyls

“…The chlorinated pesticides are of course not immune to photodegradation and form a variety of products depending upon conditions (9). This, however, can be quite helpful in identification, as well as quantification, of certain pesticides as recently described by Glotfelty (10) and Bills et (11). Bills (12) has also reported that mixtures of chlorinated pesticides can be identified in the presence of PCB's by trapping the GLC effluents, subjecting them to UV irradiation, and rechromatographing them to observe any interferences or changes which occur when both are present.…”