Dating aroclors new englane

11 Feb

Other physical and chemical properties vary widely across the class.As the degree of chlorination increases, melting point and lipophilicity increase, and vapour pressure and water solubility decrease.Recent studies of contaminants under the Canadian Northern Contaminants Program (NCP) have substantially enhanced our understanding of the pathways by which contaminants enter Canada’s Arctic and move through terrestrial and marine ecosystems there.Building on a previous review (Barrie et al., Arctic contaminants: sources, occurrence and pathways.Your access to the NCBI website at gov has been temporarily blocked due to a possible misuse/abuse situation involving your site.

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► An overview of CSIA techniques to measure bromine and chlorine isotopes is reported.For compounds that partition strongly onto particles, and for which the soil reservoir is most important (e.g.PCBs), we have seen a delay in their arrival in the Arctic and some fractionation toward more volatile compounds (e.g. Despite banning the production of PCB in the 1970s, and despite decreases of PCBs in environmental compartments in temperate regions, the Arctic presently shows little evidence of reduced PCB loadings.► CSIA to differentiate anthropogenic and naturally-produced OHCs in marine environments.► CSIA to distinguish different chlorinated VOCs sources in groundwater.