Study on the Release and Pollution of Heavy Metals in Liuyang River Sediments

The heavy metals in the sediment of Liuyang River will be released to the environment and bring the second pollution. Effects on the heavy metals release are studied,such as time,pH,temperature and the commonly-seen Na+and Mg2 +when concentrations of Cl-,NO-3and SO2-4are certain. The results show that: ①the contamination sequence for heavy metals is Cd Pb Cu Ni,meanwhile the potential ecological risk factor of Cd is highest and others are in lower pollution degree; ②the release of Cd and Pb is obvious,but Ni and Cu can't be seen and tested; with the increase of time,temperature and anion concentration,the release of heavy metals increases and except pH,it tends to low in middle and higher in early and late; ③the influence of Mg2 +on the release of heavy metals is obviously larger than that of Na+when concentrations of Cl-,NO-3and SO2-4are certain; and Cl-and SO2-4has a larger influence on Cd and Pb when the concentrations are the same.