Effect of dissolved oxygen and nutrient levels on heavy metal contents and fractions in river surface sediments

The Science of the Total Environment
Mengxin KangMengqi Wang

Abstract

In aquatic systems worldwide, heavy metal pollution has been increasing alongside rapidly growing anthropogenic activities, and most heavy metals are stored in sediments. Overlying water conditions may influence whether sediments act as heavy metal sinks or sources. In this study, we investigated the effects of the dissolved oxygen (DO) and nutrient levels of overlying water on the total contents and fractions of Pb, Zn, Ni, Cu, Mo, and Fe in river surface sediments. Sediments and overlying water were collected from a tributary of the Hai River in Tianjin, China, and then incubated for 61 days under laboratory conditions. The chemical speciation of heavy metals was determined following the modified Community Bureau of Reference (BCR) three-step sequential extraction procedure. The results showed that Pb, Zn, and Fe were released from the sediments in an anoxic environment and adsorbed from the overlying water in an aerobic environment. High nutrient levels facilitated the adsorption of Pb, Zn, Cu, and Fe in the sediments, while the total content of Mo was higher under low nutrient level conditions. The DO and nutrient levels appeared to have no influence on the total content of Ni. According to the risk assessment code classifi...Continue Reading

Citations

Jul 6, 2019·Integrated Environmental Assessment and Management·Glaucia PantanoAntonio A Mozeto
Aug 30, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Kendrick Jaglal
Apr 17, 2020·Environmental Science and Pollution Research International·Shuai ShaoYubao Li
May 9, 2019·Environmental Geochemistry and Health·Kien Thanh NguyenJohn L Zhou
Jan 28, 2021·The Science of the Total Environment·Lorena S MirandaAshantha Goonetilleke
Dec 16, 2020·International Journal of Environmental Research and Public Health·Tenzin TseringMahmoud S M Abdel Wahed
Oct 3, 2020·Heliyon·Emanoelle Pereira da SilvaDaniela Melo E Silva
Mar 28, 2021·The Science of the Total Environment·Linqi TianHelong Jiang
Jul 7, 2021·Water Research·Lorena S MirandaAshantha Goonetilleke

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