Abstract
Abstract Between November 1997 and February 1998, air and water samples were collected on the African side of the South Atlantic Ocean to Antarctica, on board the S.A. Agulhas, to determine the spatial distribution of α-hexachlorocyclohexane (α-HCH) and the net direction of air/water gas exchange. The α-HCH concentrations in air and surface water were much lower than in Arctic regions, consistent with the historically lower usage of technical HCH in the Southern Hemisphere. The water/air fugacity ratios of α-HCH were ⩽1.0, indicating steady state or net deposition conditions. The α-HCH in water was enantioselectively metabolized, with resulting enantiomer fractions (EFs) that differed from the racemic (0.500) value of the technical product. The EFs decreased from >0.500 at the lower latitudes to
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