Occurrence, temperature and seasonal trends of α- and γ-HCH in air (Quebec, Canada)

被引：27

作者：

Garmouma, M ^{[1
]}

Poissant, L ^{[1
]}

机构：

[1] Environm Canada, Meteorol Serv Canada, Sect Atmospher Tox Proc, Montreal, PQ H2Y 2E7, Canada

来源：

ATMOSPHERIC ENVIRONMENT | 2004年 / 38卷 / 03期

关键词：

pesticide; gamma-HCH; alpha-HCH; air; Quebec; seasonal trend; long-range and short transport;

D O I：

10.1016/j.atmosenv.2003.10.007

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Atmospheric concentrations of alpha- and gamma-hexachlorocyclohexane (HCH) were measured during 1993-1995 along the St. Lawrence River in Quebec, Canada. Average alpha- and gamma-HCH concentrations (pg/m(3)) were St. Anicet: 93-101; Villeroy: 92-42; Mingan: 96-20, respectively. alpha-HCH mean concentrations were similar in all sites and appeared to be more influenced by long-range transport than local sources. gamma-HCH mean levels in St. Anicet were 2 and 5 times higher than in Villeroy and Mingan, respectively. The time-series of gamma-HCH air concentrations at St. Anicet and Villeroy were characterised by highly elevated springtime episodes, which are in agreement with the gamma-HCH usage in Quebec as corn seed dressing pesticide. No temporal trend was observed for the alpha-HCH in air. Clausius-Clapeyron plots (log conc. vs. 1/T) showed a stronger correlation between temperature and measured gamma-HCH concentrations at St. Anicet and Villeroy than Mingan. On a regional scale, the influence of the local sources of gamma-HCH implied a seasonal variability in air concentrations due to its short transport, while at the background site (Mingan), the observed alpha- and gamma-HCH concentrations in air were the result of its long-range transport and/or water/air gas exchanges. Crown Copyright (C) 2003 Published by Elsevier Ltd. All rights reserved.

引用

页码：369 / 382

页数：14

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