攀枝花尾矿库溪流中钒的分布及化学形态

DISTRIBUTION AND CHEMICAL SPECIATION OF VANADIUM IN DOWNSTREAM OF PANZHIHUA TAILINGDAM

采用ICP-AES方法测定攀枝花尾矿库溪流水、悬浮物、沉积物中钒的含量,以及沉积物中钒的化学形态.结果表明:不同介质中钒的含量均高于全球钒的平均值;钒主要存在于沉积物及悬浮物中;水相中钒的含量主要与沉积物中钒的含量及存在形态有关;沉积物中的钒以残留态为主,各形态钒的比例主要受上覆水体理化性质的影响.

A total of 11 water samples, 11 sediment samples, and 9 suspended substance samples were collected along the stream through the Panzhihua Tailing-dam. The total concentrations of vanadium in water, suspended substance and sediment were analyzed by ICP-AES method, and the chemical speciation of vanadium in the sediment was analyzed by improved BCR three-step sequential extraction procedure. In the study area, the total contents of vanadium in water, sediment and suspended substance were higher than those average values of the world, and vanadium distributed in the sediment and suspended substance. The concentration of vanadium ranged from 0. 094 mg· l^-1 to 0. 285 mg· l^-1 in the stream water, which was far greater than China Sanitary Standard for Drinking Water Quality （0. 05mg· l^-1 ） The concentration of vanadium ranged from 96 mg· l^-1 to 1816 mg· l^-1in the sediment, which was higher than that in shale （140mg· l^-1） . The residual fractionation of vanadium was dominant in the sediment. Oxidizable, reducible and soluble component were bioavailability under a certain condition, while the ecological risk was potential because of vanadium bioavailability was high.