铜在沉积物各相中分配的实验模拟与数值模拟研究——以鄱阳湖为例

实测表明,在鄱阳湖沉积物各地球化学相中,铜主要赋存于有机相和水合铁锰氧化物相中。沉积物中各地球化学相的含量是金属离子在沉积物中分布的控制因子之一。 本研究通过模拟沉积物对Cu~(2+)的吸附实验求得了一定条件(pH、T℃)下模拟沉积物各相的条件平衡常数,并应用S.M.Oakley、Davies-Colley等所提出的经简化的分配模型,预测了铜在沉积物各地球化学相中的分配,所得结果与实测结果吻合。

MODELING STUDY ON COPPER PARTITIONING IN SEDIMENTS, A CASE STUDY OF POYANG LAKE

The partitioning of copper in sediments from the Poyang Lake was studied. The distribution of copper among different geochemical phases in sediments was controlled by the abundance of the correspondent geochemical phases in sediments. The model proposed by Oakley et al. and Davies-Colley et al. was applied to predict the partitioning of copper among different geochemical phases in aquatic sediments. The conditional equilibrium constants were determined using an artificial system under various pH and temperature conditions. The model was employed to describe the metal partitioning in sediment samples from the Poyang Lake and the results were consistent with that measured in laboratory.