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Heavy metals contamination and risk assessment in sediments of Laucala Bay, Suva, Fiji

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doi: 10.1016/j.marpolbul.2020.111238
Authors:Pratap, Arsita; Mani, Francis S.; Prasad, Surendra
Author Affiliations:Primary:
University of the South Pacific, School of Biological and Chemical Sciences, Faculty of Science, Technology and Environment, Suva, Fiji
Volume Title:Marine Pollution Bulletin
Source:Marine Pollution Bulletin, Vol.156. Publisher: Elsevier, Oxford, United Kingdom. ISSN: 0025-326X
Publication Date:2020
Note:In English. 65 refs.; illus., incl. 9 tables, sketch map
Summary:Spatial distribution of metals (Cd, Cr, Cu, Fe, Ni, Pb and Zn) were studied in the surficial sediments from 20 sampling sites of Laucala Bay Suva, Fiji to assess the significance of wastewater effluent discharged from Kinoya Wastewater Treatment Plant (KWWTP) into Laucala Bay as a major source. The bioavailability of these metals was also assessed using the fractionation technique. The total concentrations of individual metals varied from 1.7-6.0 mg/kg Cd, 24.2-49.1 mg/kg Cr, 54-170 mg/kg Cu, 13,733-68,492 mg/kg Fe, 23.5-34.8 mg/kg Ni, 50-80 mg/kgPb and 15.5-157.0 mg/kg Zn. All the metals studied except Ni showed significant increase around the KWWTP effluent discharge sites indicating that prolong discharge of wastewater could be a major source of their accumulation in Laucala Bay. The multivariate statistical analysis confirmed that Cd, Cu and Pb could be attributed to similar sources like wastewater effluent. The study confirmed that the spatial distribution of the metals in Laucala Bay was affected by the hydrodynamic of Laucala Bay as pollutants were dispersed from the point sources. The Risk Assessment Code (RAC) assessed from the bioavailable fraction data confirmed that apart from Cd and Pb, the rest of the metals analysed had medium risk of toxicity. Owing to the persistent nature of metals and the results obtained from this study, there is a high probability of these metals to accumulate and increase in concentration in the future which could also lead to increase in their risk of toxicity to living beings.
Subjects:Bioavailability; Concentration; Contaminant plumes; Effluents; Heavy metals; Metals; Multivariate analysis; Point sources; Pollutants; Pollution; Risk assessment; Sediments; Statistical analysis; Toxicity; Waste water; Fiji; Melanesia; Oceania; Suva Fiji; Viti Levu; Laucala Bay
Coordinates:S180800 S180800 E1782500 E1782500
Record ID:883205-50
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
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