作　　者： (王晟亦）; (盛媛）; (张军）; (宋波）; (王敦球）; (解庆林）;

机构地区： 桂林理工大学、广西环境污染控制理论与技术重点实验室,广西桂林541004 桂林理工大学、岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541004

出　　处： 《环境科学与技术》 2017年第7期86-92,共7页

摘　　要： 该文采用再悬浮模拟装置模拟再悬浮过程中大环江和刁江回水区沉积物中溶解态和颗粒态Pb、Cd和As的含量变化,计算不同扰动强度下的释放通量,以评价再悬浮过程对大环江和刁江水体重金属含量的影响。结果表明,大环江和刁江柱样中上覆水中的DO、p H和SS随扰动均呈增加趋势,3种重金属在颗粒物-水相间的分配系数高于孔隙水-沉积物;再悬浮作用能使沉积物中溶解态重金属迁移进入上覆水中,Pb和Cd迁移能力强于As;再悬浮过程中大环江上覆水中溶解态Pb、Cd及As的总平均通量分别为-0.04、-0.06、0μg/(m^2·min),刁江上覆水中溶解态Pb、Cd及As总平均通量分别为-1.3、-0.01、0.55μg/(m^2·min)。 This paper described experimental studies to simulate re-suspension of sediments of the backwater zones of two rivers （Dahuan River and Diao River in Guangxi）, focusing on heavy metal （Pb, Cd and As） concentrations changes in both of dissolved and particulate status of the sediments; thereafter, the partition coefficients between sediment and overlying water and release flux under different disturbance intensity were calculated. In consequence, the studies showed that parameters such as DO, pH and SS in overlying waters of the two rivers increased with the disturbance; heavy metals （Pb, Cd and As） partition coefficients of particulate-water phase were higher than those of pore water-sediment phase; and re-suspension let dissolved heavy metals in sediment transfer into the overlying waters, and the transfer ability of Pb and Cd was greater than that of As. Furthermore, it was found that dissolved heavy metals that released to the water by re-suspension were readsorbed to suspended particles, and gradually deposited in the bottom sediments when the disturbance weakened; and the total average flux of Pb, Cd and As in dissolved state in the overlying water of Dahuan River during re-suspension process were -0.04, -0.06, and 0 μg/（m^2·min）, respectively and those of Diao River were -1.3, -0.01, 0.55 μg/（m^2·min）, respectively.

关 键 词： 沉积物 再悬浮 重金属 释放 分配系数