Abstract
This study investigated sediments quality in coastal-urban rivers of Dar es Salaam, Tanzania along the Indian Ocean coast, that are strongly influenced by human activities. Sediment samples were seasonally collected from fifteen sites and one control location, treated as appropriate, and analyzed by high-resolution inductively coupled plasma mass spectrometer for Cd, Sn, Pb, Cr, Co, Ni, Cu, Al, Mn, Fe, and Zn. Concentrations ranged from 0.06 (Cd) to 92,479 (Al) mg/kg dry weight. Levels were higher during dry season than wet season. Cd, Sn, Pb, Co, Cr, and Zn were enriched in > 50% of the sites. Comparison with risk-based regulatory sediment quality thresholds depicted considerable ecological risk in > 70% of the sites. Evaluation by sediment quality indices identified two hotspots that require intervention. The highest contributors to the Risk Index were Pb and Cd (> 60%). These findings indicate risks to human health and river ecology that call for measures to protect the rivers from further contamination.
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References
Alberts, J. M., & Sullivan, M. P. (2016). Factors influencing aquatic-to-terrestrial contaminant transport to terrestrial arthropod consumers in a multiuse river system. Environmental Pollution, 213, 53–62. https://doi.org/10.1016/j.envpol.2016.02.003
Aliu, O. O., Akindele, E. O., & Adeniyi, I. F. (2021). Potentially toxic metals record high contamination indices in three small African rivers. International Journal of Energy and Water Resources, 5, 175–184. https://doi.org/10.1007/s42108-020-00091-4
Canadian Council of Ministers of the Environment (CCME). (1999). Canadian Sediment Quality Guidelines for the Protection of Aquatic Life, (CCME, Winnipeg, Canada.
Cooper, J. A. G., & Mckenna, J. (2008). Working with natural processes: The challenge for coastal protection strategies. The Geographical Journal; London, 174(4), 315–331. https://doi.org/10.1111/j.1475-4959.2008.00302.x
Costa, E. S., Grilo, C. F., Wolff, G. A., Thompson, A., Figueira, R. C. L., & Neto, R. R. (2015). Evaluation of metals and hydrocarbons in sediments from a tropical tidal flat estuary of Southern Brazil. Marine Pollution Bulletin, 92(1–2), 259–268. https://doi.org/10.1016/j.marpolbul.2014.11.028
Cyriac, M., Gireeshkumar, T. R., Furtado, C. M., Fathin, K. P. F., Shameem, K., Shaik, A., Vignesh, E. R., Nair, M., Kocherla, M., & Balachandran, K. K. (2021). Distribution, contamination status and bioavailability of trace metals in surface sediments along the southwest coast of India. Marine Pollution Bulletin, 164(2021), 112042. https://doi.org/10.1016/j.marpolbul.2021.112042
Duncan, A. E., de Vries, N., & Nyarko, K. (2018). Assessment of heavy metal pollution in the sediments of the River Pra and its tributaries. Water, Air and Soil Pollution, 229, 272. https://doi.org/10.1007/s11270-018-3899-6
El-Alfy, M. A., El-Amier, Y. A., & El-Eraky, T. E. (2020). Land use/cover and eco-toxicity indices for identifying metal contamination in sediments of drains, Manzala Lake, Egypt. Heliyon, 6(1), E03177. https://doi.org/10.1016/j.heliyon.2020.e03177
Francis, J., & Bryceson, I. (2000). Tanzanian coastal and marine resources: Some examples illustrating questions of sustainable use. University of Dar es Salaam Research Repository http://hdl.handle.net/20.500.11810/3846.
Gaspare, L., Machiwa, J. F., Mdachi, S. J. M., Streck, G., & Brack, W. (2009). Polycyclic aromatic hydrocarbon (PAH) contamination of surface sediments and oysters from the inter-tidal areas of Dar es Salaam, Tanzania. Environmental Pollution, 157, 24–34. https://doi.org/10.1016/j.envpol.2008.08.002
Hakanson, L. (1980). An ecological risk index for aquatic pollution control: A sedimentological approach. Water Research, 14, 975–1001. https://doi.org/10.1016/0043-1354(80)90143-8
Kruitwagen, G., Pratap, H. B., Covaci, A., & Wendelaar-Bonga, S. E. (2008). Status of pollution in mangrove ecosystems along the coast of Tanzania. Marine Pollution Bulletin, 56, 1022–1042. https://doi.org/10.1016/j.marpolbul.2008.02.018
MacDonald, D. D., Ingersoll, C. G., & Berger, T. A. (2000). Development of evaluation of consensus-based sediment quality guidelines for freshwater ecosystems. Archives of Environmental Contamination and Toxicology, 39, 20–31. https://doi.org/10.1007/s002440010075
Masalu, D. C. P. (2000). Coastal and marine resource use conflicts and sustainable development in Tanzania. Ocean and Coastal Management, 43(6), 475–494. https://doi.org/10.1016/S0964-5691(00)00039-9
Mayoma, B. S., Sørensen, C., Shashou, Y., & Khan, F. R. (2020). Microplastics in beach sediments and cockles (Anadaraantiquata) along the Tanzanian coastline. Bulletin of Environmental Contamination and Toxicology, 105, 513–521. https://doi.org/10.1007/s00128-020-02991-x
McLennan, S. M., & Taylor, S. R. (1999). Earth’s continental crust. In C. P. Marshall & R. W. Fairbridge (Eds.), Encyclopedia of geochemistry (pp. 145–150). Kluwer Academic Publishers. https://doi.org/10.1093/petrology/41.12.1821
Mhina, G. J., Bergen, J. M., Mbuligwe, S. E., & Kassenga, G. R. (2018). Mapping the gap of water and erosion control measures in the rapidly urbanizing Mbezi River catchment of Dar es Salaam. Water, 10(1), 64. https://doi.org/10.3390/w10010064
Mihale, M. J. (2017). Environmental health risks due to anthropogenic metals in Mtoni estuary ecosystem and its environs. Huria: Journal of the Open University of Tanzania, 24(1), 1–24.
Mihale, M. J., Croes, K., Tungaraza, C., Baeyens, W., & Van Langenhove, K. (2013). PCDD/F and dioxin-Like PCB determinations in Mtoni Estuarine Sediments (Tanzania) using the Chemically Activated Luciferase Gene Expression (CALUX) bioassay. Environment and Pollution, 2(3), 1–19. https://doi.org/10.5539/ep.v2n3p1
Msindai, K. A. (2002). Engineering geological mapping of Dar es Salaam city, Tanzania. Tanzania Journal of Science, 28(2), 83–96. https://doi.org/10.4314/tjs.v28i2.18356
Mtoni Y., Mjemah, I. C., Msindai, K., Van Camp, M., & Walraevens, K. (2012). Saltwater intrusion in the quaternary aquifer of the Dar es Salaam region, Tanzania. Geological Belgica, 15(1–2), 16–25. http://hdl.handle.net/1854/LU-1897437.
National Bureau of Statistics. (NBS). (2019). Tanzania in figures 2018. Dodoma, Tanzania. June 2019. Available at https://www.nbs.go.tz/nbs/takwimu/references/Tanzania_in_Figures_2018.pdf.
Neumann, B., Vafeidis, A. T., Zimmermann, J., & Nicholls, R. J. (2015). Future coastal population growth and exposure to sea-level rise and coastal flooding—A global assessment. PLoS ONE, 10(3), e0118571. https://doi.org/10.1371/journal.pone.0118571
Rajaram, R., & Ganeshkumar, A. (2019). Anthropogenic influence of heavy metal pollution on the Southeast Coast of India. In M. Ramkumar, A. R. James, D. Menier, & K. Kumaraswamy (Eds.), Coastal zone management (pp. 381–399). Elsevier. https://doi.org/10.1016/B978-0-12-814350-6.00016-1
Sharifuzzaman, S. M., Rahman, H., Ashekuzzaman, S. M., Islam, M. M., Chowdhury, S. R., & Hossain, M. S. (2016). Heavy metals accumulation in coastal sediments. In H. Hasegawa, I. Rahman, & M. Rahman (Eds.), Environmental remediation technologies for metal-contaminated soils (pp. 21–42). Springer. https://doi.org/10.1007/978-4-431-55759-3_2
Taleuzzaman, M. (2018). Limit of blank (LOB), limit of detection (LOD), and limit of quantification (LOQ). Organic and Medicinal Chemistry International Journal, 7(5), 1–5. https://doi.org/10.19080/OMCIJ.2018.07.555722
Williams, J. A., & Antoine, J. (2020). Evaluation of the elemental pollution status of Jamaican surface sediments using enrichment factor, geo-accumulation index, ecological risk and potential ecological risk index. Marine Pollution Bulletin, 157, 111288. https://doi.org/10.1016/j.marpolbul.2020.111288
Zhang, J., Zhou, F., Chen, C., Sun, X., Shi, Y., Zhao, H., & Chn, F. (2018). Spatial distribution and correlation characteristics of heavy metals in the seawater, suspended particulate matter and sediments in Zhanjiang Bay, China. PLoS ONE, 13(8), e0201414. https://doi.org/10.1371/journal.pone.0201414
Zhang, L., & Liu, J. (2014). In situ relationships between spatial-temporal variations in potential ecological risk indexes for metals and the short-term effect on periphyton in a microphyte-dominated lake: A comparison of structural and functional metrics. Ecotoxicology, 23, 553–566. https://doi.org/10.1007/s10646-014-1175-0
Zhang, M., He, P., Qiao, G., Huang, J., Yuan, X., & Li, Q. (2019). Heavy metal contamination assessment of surface sediments of the Subei Shoal, China: Spatial distribution, source apportionment and ecological risk. Chemosphere, 223, 211–222. https://doi.org/10.1016/j.chemosphere.2019.02.058
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The authors wish to thank all who assisted in conducting this work.
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This research was funded by the Flemish Inter-University Council for University Development Cooperation (VLIR-UOS) Brussels, Belgium, under the South Initiative Project No. ZEIN2014Z163 titled ‘Tracing the status and impacts of terrestrial contamination in the coastal environments of Tanzania’ (VLIR296).
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Mhande, Z., Mihale, M.J., Hellar-Kihampa, H. et al. Trace metal enrichment and sediment quality in coastal-urban rivers along the Indian Ocean coast, Dar es Salaam, Tanzania. Int J Energ Water Res 7, 119–132 (2023). https://doi.org/10.1007/s42108-022-00212-1
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DOI: https://doi.org/10.1007/s42108-022-00212-1