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PARTITIONING OF METALS TO SEDIMENT ORGANIC CARBON

机译：金属对沉积物有机碳的分配

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摘要

The partition coefficients and sorption capacities for cadmium, copper, and lead in freshwater sediments are derived from fitting a Langmuir isotherm to data from 14 sediments. The metal activity in the solution phase was measured using specific ion electrodes. The metal sorption due to acid-volatile sulfide was subtracted from the total sorbed metal to produce the metal bound to other sediment phases. Organic carbon normalized isotherms provide a reasonable representation of the metal sorption. Partition coefficients and capacities are calculated for pH = 6, 7, and 8 (for Cd). The organic carbon normalized isotherm parameters for the sediments are compared to those reported for soils and sludges. The comparisons for cadmium exhibit differences for which no ready explanations are available. For copper and lead, however, the differences can be attributed to the use of specific ion electrodes for measuring metal activity in the sediment experiments. The cadmium sediment partition coefficients contribute a small increment to the sediment quality criteria. For copper and lead, however, the additional binding to sediment organic carbon is significant and can amount to 1 to 10 and 10 to 100 μmol/g dry weight for lead and copper, respectively, depending on the organic carbon concentration of the sediment.
机译：淡水沉积物中镉，铜和铅的分配系数和吸附能力是根据Langmuir等温线与14个沉积物的数据拟合得出的。使用特定的离子电极测量溶液相中的金属活性。从总吸附的金属中减去由于酸-挥发性硫化物引起的金属吸附，从而产生结合到其他沉积相的金属。有机碳标准化等温线提供了金属吸附的合理表示。计算pH = 6、7和8（对于Cd）的分配系数和容量。将沉积物的有机碳归一化等温线参数与报告的土壤和污泥的等温线参数进行比较。镉的比较显示出差异，尚无可用的解释。但是，对于铜和铅，差异可以归因于在沉积物实验中使用特定的离子电极来测量金属活性。镉沉积物分配系数对沉积物质量标准的贡献很小。但是，对于铜和铅，与沉积物有机碳的额外结合非常重要，铅和铜的干重分别为1至10和10至100μmol/ g干重，具体取决于沉积物的有机碳浓度。

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