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>Historical inputs of PCDDs, PCDFs, and PCBs to British Columbia interior lake: the effect of environmental controls on pulp mill emissions
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Historical inputs of PCDDs, PCDFs, and PCBs to British Columbia interior lake: the effect of environmental controls on pulp mill emissions
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机译：Historical inputs of PCDDs, PCDFs, and PCBs to British Columbia interior lake: the effect of environmental controls on pulp mill emissions
A sediment core collected from Kamloops Lake, British Columbia, was used to assess historical inputs of polychlorinated dioxin and furans (PCDD/Fs) from a pulp mill and the effects of recent environmental controls. Principal components analysisreveals that four groups of compounds can be found in the sediments: moderately chlorinated PCDDIFs produced during the bleaching of pulp with chlorine (e.g., TCDF); PCDD/Fs that have been produced by condensation of polychlorinated phenoxyphenolcontaminants during pulping (e.g., HxCDDs); highly chlorinated PCDD/ Fs that are derived from mixed sources (e.g., OCDD); and a series of PCBs that are probably derived from mixed sources. Strong correlations of CB13, CB15, and CB37 with the moderatelychlorinated PCDD/Fs suggest that these PCBs have been produced in-situ by the pulp mill. In particular, CB15 is found in quantities rivaling those of total TCDF. In the 1930s-1950s, sediments exhibit minor contamination by the PCBs and higher chlorinateddioxins and furans. With the construction of the mill in 1965, large quantities of HxCDD and the tetra-chlorinated PCDD/Fs were released. Technological changes at the pulp mill have effected a drastic reduction in pulp mill PCDD/Fs in the 1990s.
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