摘要:
2007~2009年对松花江干流、嫩江下游江段、第二松花江干流水质、底质和鱼类汞含量状况进行了调查研究,并参照渔业水质标准、无公害水产品产地环境要求、无公害水产品安全要求和松花江流域汞的背景值对流域生态环境汞污染进行评价。结果表明:江水中总汞含量0.000010~0.000172 mg/L,符合渔业水质标准要求;第二松花江底质中总汞含量范围0.026~1.632 mg/kg;松花江干流底质中总汞含量范围＜0.01~0.102 mg/kg,基本符合无公害水产品产地环境要求;鱼体中总汞含量0.043~0.268 mg/kg,甲基汞含量0.037~0.235 mg/kg,基本符合无公害水产品安全要求,仅个别鲶鱼甲基汞含量超标。部分水质、底质、鱼体中汞含量超过环境背景值。
关键词:
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松花江流域
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渔业生态环境
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汞
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甲基汞
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评价
Abstract:
Twenty years ago,serious mercury pollution was encountered in Songhua River.Now,in order to assess the environment quality and the suitability for fisheries in Songhua River,investigations focused on this river basin,including main streat of Songhua River and the Second Songhua River,and the lower reaches of Nen River,were carried out from 2007 to 2009 consulted fishery water quality standard,origin environment requirement and security requirement of nuisanceless aquatic products.The samples(water,sediment and fishes)were monitored for mercury and methylmercury.The results were as follows:the mercury in water was 0.000010~0.000172mg/L,which can meet the requirement of the water quality standard for fisheries.Total mercury in sediment was<0.01~1.632mg/kg,in the main,fit for the requirement of the Safety qualification for agricultural product-environmental requirements for origin of non-environmental pollution aquatic products.Total mercury in fish was 0.043~0.268mg/kg,methylmercury was 0.037~0.235mg/kg,generally meet the requirement of the safety qualification for agricultural product-environmental requirement for origin of non-environmental pollution aquatic products,only methylmercury in few of catfish higher than the requirement.Mercury content of some of the samples exceeded the value of environmental background.
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