摘要
本研究的目的在于寻找流入里加湾(波罗的海的一部分)的聚氯联苯(PCBs)的潜在来源。在拉脱维亚的道加瓦和利耶卢佩河中的河鲈体内,定量检测到PCBs,DDT及有关化合物,六氯苯(HCB),二氯苯基砜(BCPS)及两种六氯环己烷(HCH)异构体。利耶卢佩当地的PCBs污染很可能来源于叶尔加瓦城市地区。进一步在利耶卢佩河下游检测到BCPS的浓度由53ng/g升高到160ng/g脂肪重(1.w.)。当地的p,p’-DDT和HCHs污染源似乎构成了里加首都地区下游的道加瓦河的背景污染。河鲈体内有机氯的浓度与波罗的海其他受污染地区河鲈体内报道的浓度具有相同的范围;例如,已确定PCB含量为250～1100ng/g 1.w.。
This study aimed to search for potential sources of the polychlorinated biphenyls (PCBs) contributing to the PCB input to the Gulf of Riga, as part of the Baltic Sea. PCBs, DDT-related compounds, hexachloro-benzene (HCB), bis(4-chlorophenyl) sulfone (BCPS) and 2 hexachlorocyclohexane (HCH) isomers were quantified in perch (Perca fluviatilis) from the rivers Daugava and Lielupe in Latvia. Local PCB contamination was indicated in Lielupe with the most likely origin being the Jelgava urban area. The BCPS concentrations increased from 53 to 160 ng g-1, based on lipid weight, (I.w.) progressively measured downstream of the Lielupe. Local sources of p,p '-DDT and HCHs appeared to constitute the background contamination downstream from the Riga metropolitan area, on the River Daugava. The concentrations of organochlorines were in the same range as reported for these contaminants in perch from other areas in the Baltic Sea region; e.g. PCB levels of 250-1100 ng g-1 l.w. were determined.
