Rare Earth Elements and Geochemical Partitioning of Zn and Pb in Sediments of an Urban River | Science Publications

American Journal of Environmental Sciences

H. M. Zakir¹  Shaila Sharmin¹  Naotatsu Shikazono¹ 

关键词: Rare earth elements;    minor elements;    geochemical partitioning;    sediment pollution;    Tokyo;   

DOI  :  10.3844/ajessp.2010.406.415

学科分类：环境科学（综合）

来源: Science Publications

【 摘 要 】

Problem statement: Urban river sediment pollution due to Zn and Pb is a serious problemin all over the world. The source and level of Zn and Pb pollution in sediments of Nomi River of OtaWard, one of the most industrialized areas in Tokyo, Japan is still lacking. Approach: The presentstudy focused on Rare Earth Elements (REEs) and geochemical partitioning of Zn and Pb in sedimentsof 19 sampling sites of Nomi River in order to examine the mobility pattern. The amounts of Zn andPb in the liquid extract of 5 (five) geochemical phases were measured by using Inductively CoupledPlasma Mass Spectrometry (ICP-MS) and the concentrations of REEs in sediments were determinedby using X-ray Fluorescence Spectroscopy (XRF). Results: Speciation data indicate dominant labilefraction of Zn, which is related to the presence of several anthropogenic influence of the investigatedarea. Enrichment Factor (EFc) and Index of geoaccumulation (I_geo) value were compatible with theresult, which confirm pollution status of Zn. Environmental risk of Zn and Pb were also evaluatedusing the Risk Assessment Code (RAC) and sequential extraction results and found Zn poses high tovery high risk (34-59), whereas Pb poses low to medium environmental risk (0-19). Conclusion: Themean values of REEs and other minor elements were lower or very close to average shale and Japaneseriver sediment value but Sr, Sn, Zr and Sb contents were little bit higher than average Japanese riversediment values. Anthropogenic activities, prevalent in the study area play a key role in theaccumulation of Zn and Pb in aquatic system. Early warning on the sediment pollution to respectiveauthorities help in preserving the aquatic system from further degradation of the river.

【 授权许可】

Unknown