The Long-Term Effects of Dredging on Chromium Pollution in the Sediment of Meiliang Bay, Lake Taihu, China

Sediment dredging is a common remediation tool for polluted water bodies. However, the long-term effects of on chromium (Cr) contamination remain unclear. This study was conducted to evaluate sediment Cr in Lake Taihu, six years after performed. In this study, high-resolution equilibrium dialysis (HR-Peeper) and diffusive gradients thin films (DGT) sampling techniques were used total dissolved DGT-labile Cr(VI) at interface. The results show that vertical averaged concentrations summer (112.6 ± 28.8 ?g/L) winter (115.3 29.9 non-dredged site above fisheries quality standard (AEPC, 2002). They 38% lower overlying 20% pore dredged winter, while reduction not evident. concentration significantly higher spring autumn than those site, which probably caused by large rainfall river discharge during two seasons. vertically both sites did exceed drinking requirements (WHO, 1993). Modeling DGT-induced fluxes from into showed response time (Tc) adsorption rate (k1) desorption (k?1) except summer, indicating decreased mobility sediments. Overall, these confirm risk Taihu.