Trends and seasonality in α-and γ-hexachlorocyclohexane in western Canadian surface waters (1975-94)

摘要

Surface water monitoring results (1975-94) for α-hexachlorocyclohexane (α-HCH) and γ-hexachlorocyclohexane (γ-HCH, lindane) from nine sites in the Canadian prairie provinces were examined for long-term trends and seasonality. The monitoring sites represented four major ecozones of the prairie provinces, including agricultural and non-agricultural areas. Decreasing trends in α-HCH concentration and detection frequency were found at all sites, likely related to decreased use of technical HCH world-wide.