Distribution, sources and ecological risk of trace elements and polycyclic aromatic hydrocarbons in sediments from a polluted urban river in central Bangladesh
| Autor: | A.B.M. Badruzzaman, Md. Bodrud-Doza, A. K. M. Atique Ullah, Md. Bazlar Rashid, M. A. Islam, Abu Reza Md. Towfiqul Islam, Md. Abu Bakar Siddique, Sayeda Ummeh Masrura, Md. Syful Islam, Kamrun Naher, Mizanur Rahman Sarker, A. R. M. Tareq, Rahat Khan, Md. Moazzem Hossain Miah, Md. Ahosan Habib, Sopan Das |
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| Rok vydání: | 2020 |
| Předmět: |
Pollution
010504 meteorology & atmospheric sciences Materials Science (miscellaneous) media_common.quotation_subject Sampling (statistics) Flux Sediment 010501 environmental sciences Management Monitoring Policy and Law Fluorene Contamination 01 natural sciences chemistry.chemical_compound chemistry Benthic zone Environmental chemistry Environmental science Enrichment factor Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology media_common |
| Zdroj: | Environmental Nanotechnology, Monitoring & Management. 14:100318 |
| ISSN: | 2215-1532 |
| DOI: | 10.1016/j.enmm.2020.100318 |
| Popis: | To assess the spatial and layer-wise distributions of 26 elements (Na, Al, Mg, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Sb, Co, Ba, Zn, Rb, Cs, La, Ce, Sm, Eu, Yb, Ta, Hf, Th and U) as well as the spatial distributions of polycyclic aromatic hydrocarbons (PAHs) in a polluted urban river (Turag, Bangladesh), benthic sediment samples from 11 different sampling stations were analyzed. Concentrations of Ti, Cr, Mn, Zn, Rb and Cs ranged from 2330 to 5490, 23–116, 186–4298, 34–7345, 77–186 and 2.19–12.0 μg.g−1(dw), respectively, whereas concentrations of ∑PAHs ranged from 45.8 to 1901 with an average value of 432 μg.kg−1(dw) in surface sediments. Geo-accumulation index, enrichment factor and pollution load index were used to assess the contamination level. Among the 26 elements, Zn is identified as the major elemental contaminant which shows significant layer-wise variations (RSDs: 21.7–221 %) at all sampling sites. Similarly, Cr, Mn, Ti, V, Fe and Co show layer-wise variation in some specific sampling sites which invokes variable contamination flux over the industrialization and/or urbanization period. Principal component analysis (PCA) and correlation study ascertained several anthropogenic sources for heavy metal contaminations. Although rare earth elements (La, Ce, Sm, Eu and Yb) seem to have crustal origin, their layer-wise variations are assumed to represent the sediment response toward the pollution load. Integrated study based on the diagnostic ratios and PCA depicted that pyrolytic origins mostly govern the PAHs distributions. Sediments quality guidelines (SQGs) indicated that the highest potential ecological risks occurred for Zn and fluorene at some specific sampling sites. |
| Databáze: | OpenAIRE |
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