Air-water gas exchange and evidence for metabolism of hexachlorocyclohexanes in Resolute Bay, N.W.T.

摘要: Paired air and water samples were collected at Resolute Bay (74°N, 95°W) in summer 1992 to estimate the direction of gas exchange hexachlorocyelohexanes (HCHs) investigate possible loss processes column. Average concentrations α-HCH γ-HCH ocean surface 4.7 ± 0.9 0.44 0.11 ng/l, respectively. These α- levels are ∼ 66–104% 54–72% values reported for central Aretic Ocean Canadian Ice Island 1986. Mean atmospheric (114 16 9.8 1.3 pg/m3) 2–3 times lower than Arctic 1980s. The (−1.4°C) was approximately within Henry's Law equilibrium with respect levels. Water/air fugacity ratios 1.03 1.57 α-HCH, indicating a slight potential volatilization #x003B1;-HCH. two enantiomers separated by chromatography on γ-cyclodextrin capillary enantiomeric ratio (ER = (+)α-HCH/(−)α-HCH) 1.00 0.04. This agrees excellently ER 0.01 found racemic standard. (+) enantiomer depleted seawater, resulting 0.93 0.06 Bay. ERs from Amituk Lake Cornwallis ranged 0.65 0.99, depending location, data relative contributions fresh snowmelt older lake water. results suggest that microbial degradation HCHs is taking place lakes near-shore marine waters.