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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Analysis on seasonal distribution characteristics of heavy metals on riverbed of dapuhe river estuar...
Analysis on seasonal distribution characteristics of heavy metals on riverbed of dapuhe river estuary, china
Dapuhe River, located in Qinhuangdao, China, is one of the most contaminated rivers due to the wastewater from its
watershed discharging into the river. Since contaminants (especially heavy metals) can easily stick on sediments and then
deposit on the riverbed, sediments contaminated by heavy metals become the potential secondary pollution sources to
aquatic system. To assess the effects of heavy metals on the estuarine environment, seasonal distribution characteristics
of heavy metal in surface sediments on riverbed of Dapuhe River were investigated in this study. Sediment samples were
collected at 6 sites along the river estuary during August (i.e. the flood season) and November 2011 (i.e. the dry season).
They were analyzed by polarization spectrometer for heavy metals to examine the element distribution pattern and
pollution status. The concentrations (mg/kg) of heavy metals were for Cu in 10.2-322.0, Zn in 19.7-435.2, Cd in 0.04-0.59,
Pb in 4.2-142.0, Cr in 37.0-154.6, Hg in 0.02-0.73, As in 0.6-36.7, respectively. A primary assessment with Geoaccumulation
Index and Potential Ecological Risk Index indicated that the pollution status associated with heavy mental in
sediments was unpolluted to moderate polluted which posed a light potential ecological risk to the aquatic environment.
The pollution status of the river in the flood season was worse than that in the dry season, and the middle reach of the
river (especially the branch of Guhe River) may suffer more pollution than the upper and the lower reaches. It was also
found that the contaminated degree of heavy metal on the riverbed sediments was: Cu>Pb>Zn>Hg>As>Cd>Cr and some
heavy metals from metallic wastewater discharges along the river were likely to result in harmful effects on river
ecosystem. Although the concentrations of metals were lower than the threshold level in the study area, an attention still
should be paid to the potentially ecological risk of heavy metal on bed sediments of Dapuhe River estuary.
File Size : 437,999 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 28/08/2015
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