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1993年,波罗的海诸国之间相互合作,共同进行了波罗的海沉积物中多氯联苯(PCB)的大规模调查。地表沉积物中PCB(IUPAC#52,101,118,105,153,138,180)从北(平均213ng/gC)至南(平均382ng/gC)呈增加趋势,表明了大气的影响。与远海生物群中PCB的下降趋势相反,波罗的海本体中已确定年代的沉积物中的PCB在最近几十年中呈增加趋势或持续富集。岩心内同类物格局显示在20世纪没有变化。在假定年际干物质沉积发生变化的条件下,重新计算了PCB沉积,结果发现PCB沉积物的沉淀趋势与所观察到的波罗的海生物群中的PCB富集趋势是一致的,只不过近几十年来沉积物中减少得较少。PCB的沉积物埋藏计算表明,波罗的海本体的纹层沉积是有效的捕集剂;质量平衡表明,水体中PCB的保留时间少于1年。
In 1993, the Baltic states cooperated with each other to conduct a large-scale survey of PCBs in the Baltic Sea sediments. PCBs (IUPAC # 52,101,118,105,153,138,180) in surface sediments show an increasing trend from north (average 213 ng / gC) to south (average 382 ng / gC), indicating the effect of the atmosphere. In contrast to the declining trend of PCBs in far-sea biota, PCBs in sediments of established age in the Baltic ontology have been increasing or continuing to enrich in recent decades. The pattern of congeners in the core shows no change in the 20th century. PCB deposition was recalculated assuming a change in dry matter deposition on the interannual folks and the trend was that precipitation of PCB sediments was consistent with observed trends in PCB enrichment in the Baltic Sea biota, Sediment decreased less in years. Calculations of PCB sediment burial suggest that laminar deposition of the Baltic ontology is an effective collector; the mass balance indicates that PCB retention in water is less than one year.