Research on Heavy Metals Release Pattern of Waterfront Tidal River Sediment

Abstract

The waterfront tidal river, Neijiang in Zhenjiang city, was studied by monitoring the heavy metals content distribution in sediment. In this study, the relationship between sedimentary heavy metals release rates and dynamic disturbance was established for different pollution situation in Neijiang. Based on the synchronous hydrological and water quality monitoring, the spatio-temporal changing laws of heavy metals release rates of different hydrological characteristics, such as in flood and dry seasons, was induced systematically. Experiment results show that As, Pb, Cd are the major heavy metals which pollute the water quality of Neijiang river. The heavy metals concentration in the south area is generally higher than that in the north area. The release rates of As, Pb, Cd increase with the growth of disturbance intensity and content in sediment and can reach 121.2 mg/m2.d, 140.8 mg/m2.d and 4.4mg/m2.d respectively in flood seasons．The average release rates of As, Pb, and Cd in flood season increase by 210%, 121%, 198% than that in dry season respectively.