Effects of Sediment Re-suspension on Release of Pb, Cd and As in Sediments from Dahuan River and Diao River
WANG Shengyi
SHENG Yuan
ZHANG Jun
SONG Bo
WANG Dunqiu
XIE Qinglin
Abstract：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/(m2 ·min),respectively and those of Diao River were-1.3,-0.01,0.55 μg/(m2 ·min),respectively.
Keywords：sedimentre-suspensionheavy metalsrelease fluxpartition coefficients
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 86-92 )