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首页> 外文期刊>Environmental Science & Technology >Atmospheric Deposition and Fluxes of Organochlorine Pesticides and Coplanar Polychlorinated Biphenyls in Aquatic Environments of Hong Kong, China
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Atmospheric Deposition and Fluxes of Organochlorine Pesticides and Coplanar Polychlorinated Biphenyls in Aquatic Environments of Hong Kong, China

机译：中国香港水生环境中有机氯农药和共平面多氯联苯的大气沉积和通量

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摘要

Concentrations of organochlorine (OC) pesticides and coplanar (dioxin-like) polychlorinated biphenyls (PCBs) in bulk deposition were measured at the Mai Po Marshes Nature Reserve (MPMNR) and A Chau, which are both important habitats for waterbirds in Hong Kong. OC pesticides exempted from the Stockholm Convention were present in greater concentrations than those that have been restricted for use in the region. Among the OC pesticides, HCB, ΣDDTs, and ΣHCHs were detected. Concentrations of HCB were greater at MPMNR than at A Chau, and this finding suggests short-range transport of this compound, which is different from the other OC pesticides. Several environmental factors including seasonal variations in temperature, particulate matter, and rainfall may influence the flux of OC pesticides. Since sources of HCB often coexist with sources of polychlorinated dibenzo-p-dioxins and dibenzofurans (dioxins and furans), the presence of HCB may be a useful surrogate for monitoring airborne dioxins and for understanding their deposition potential. The contribution of atmospheric deposition to the OC pesticide input to the two study sites was small. Concentrations of most OC pesticides in surface waters were greaterthan would be predicted based on the inputs from atmospheric deposition and sedimentation. The mass balance calculation suggests a net flux of OC pesticides from bottom sediments to the overlying water column.
机译：在米埔沼泽自然保护区（MPMNR）和A洲，这两个都是香港水鸟的重要栖息地，测量了大块沉积物中有机氯（OC）农药和共平面（二恶英）多氯联苯（PCB）的浓度。被《斯德哥尔摩公约》豁免的OC农药的浓度高于该区域限制使用的OC农药的浓度。在OC农药中，检出了HCB，ΣDDTs和ΣHCHs。 MPMNR中的六氯代苯浓度高于A Chau的六氯代苯，这一发现表明该化合物的短程运输与其他OC农药不同。包括温度，颗粒物和降雨的季节性变化在内的几个环境因素可能会影响OC农药的通量。由于六氯代苯的来源通常与多氯代二苯并对二恶英和二苯并呋喃（二恶英和呋喃）的来源共存，因此六氯代苯的存在可能是监测空气中二恶英和了解其沉积潜力的有用替代品。大气沉降对向这两个研究地点输入的OC农药的贡献很小。地表水中大多数OC农药的浓度均高于根据大气沉积和沉积的输入所预测的浓度。质量平衡计算表明，OC农药从底部沉积物到上方水柱的净通量。

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