渭河沉积物中重金属释放的粒度效应  

Particle-size effects of heavy metal release from Wei River sediment

作　　者：黄延林[1] 

机构地区：[1]西安建筑科技大学环境工程系

出　　处：《西安建筑科技大学学报（自然科学版）》1995年第4期381-385,共5页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：陕西省自然科学基金;西安建大博士专项基金

摘　　要：相同污染浓度条件下，粗颗粒沉积物中重金属具有较高的初期释放量和释放强度；平衡释放浓度随粒度减小略有增大。考虑到沉积物吸附重金属的粒度效应，重金属释放的粒度效应会更加明显。渭河沉积物中构成重金属释放的结合形态主要为离子可交换态和碳酸盐结合态。重金属结合形态相互转化的结果是以水相中重金属释放浓度变化的动力学过程来体现的。Under the condition of same polluted concentration,heavy metals in coarse sediment are released with greater amount and higher intensity dUring initial stage.The equilibrium-release concentration increases a little with the sediment particle size decrease. Considering the particle-size effects of the sediment adsorbing heavy metals,the effects of heavy metal release from the sediment can be further strengthened.The main bounds in the sediment which have great contributions to heavy metal release are ion-exchangeable-bound and carbonate-bound respectively.The exchange results of heavy metal bounds can be reflected by the kinetic process of heavy metal released into the water phase.

关 键 词：渭河 沉积物 重金属 粒度效应 释放 

分 类 号：X142[环境科学与工程—环境科学]