THE EFFECT OF ACTIVATED CARBON ON PARTITIONING, DESORPTION, AND BIOUPTAKE OF NATIVE POLYCHLORINATED BIPHENYLS IN FOUR FRESHWATER SEDIMENTS
THE EFFECT OF ACTIVATED CARBON ON PARTITIONING, DESORPTION, AND BIOUPTAKE OF NATIVE POLYCHLORINATED BIPHENYLS IN FOUR FRESHWATER SEDIMENTS
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DOI：
10.1897/08-020.1
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发表时间：
2008-11-01
影响因子：
4.1
通讯作者：
Ghosh, Upal
中科院分区：
文献类型：
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作者：
Sun, Xueli;Ghosh, Upal
本研究评估了来自五大湖(北美)受关注地区的四种淡水沉积物中活性碳的改良效果，这些沉积物具有广泛的沉积物地球化学特征(总有机碳0.83-5.1%)和多氯联苯(PCBs)浓度(0.33-84.7mgg/g)。这项工作的重点是了解活性碳修饰剂对淡水寡毛类(Lumbrrulus Varegatus)中的多氯联苯水相分配、多氯联苯的解吸特性和多氯联苯的生物吸收的影响。结果表明，改性后的多氯联苯水相平衡浓度、快速解吸分数和寡毛菌的生物吸收率均有所降低。添加0.5倍天然有机碳的活性碳可使尼亚加拉河沉积物、格拉斯河沉积物、密尔沃基河沉积物1和密尔沃基河沉积物2的多氯联苯生物累积量分别减少42%、85%、74%和70%。多氯联苯同系物的水脂生物浓缩系数经活性碳修正后基本保持不变。我们目前的结果表明，在稳定状态下，水中多氯联苯浓度的变化可以用来预测多氯联苯在取食沉积物的生物中积累的变化。因此，使用先进的孔隙水测量技术，如固相萃取被动取样器，可能适合于长期监测处理效果。
The present study evaluated the effect of activated carbon amendment in four freshwater sediments from the Great Lakes (North America) areas of concern with a wide range of sediment geochemical characteristics (0.83 - 5.1% total organic carbon) and polychlorinated biphenyl (PCB) concentrations (0.33 - 84.7 mu g/g). The work focused on understanding the impact of activated carbon amendment on PCB aqueous partitioning, PCB desorption characteristics, and PCB biouptake in a freshwater oligochaete (Lumbriculus variegatus). The results showed that PCB aqueous equilibrium concentrations, rapid desorption fractions, and biouptake by the oligochaete were reduced after activated carbon amendment. Addition of activated carbon at a dose of 0.5-fold native organic carbon reduced PCB bioaccumulation by 42% for Niagara River sediment, 85% for Grasse River sediment, 74% for Milwaukee River sediment 1, and 70% for Milwaukee River sediment 2. A linear relationship was observed between log biota - sediment accumulation factor and the first 6-h desorption fractions for each PCB homologue for treated and untreated sediments. Water lipid bioconcentration factors for PCB congeners were largely conserved after amendment with activated carbon. Our present results suggest that at steady state, changes in the aqueous PCB concentrations can be used to predict changes in PCB bioaccumulation in deposit-feeding organisms. Thus, use of advanced pore-water measurement techniques, such as solid-phase extraction passive samplers, may be suitable for long-term monitoring of treatment performance.