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Assessment of heavy metal pollution risks in Yonki Reservoir environmental matrices affected by gold mining activity

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Abstract

This study reports the heavy metal (Hg, Cd, Cr, Cu, and Pb) contamination risks to and safety of two species of fresh water fish (tilapia, Oreochromis mossambicus and carp, Cyprinus carpio) that are farmed in the Yonki Reservoir in the Eastern Highlands of Papua New Guinea (PNG). The upper reaches of the reservoir are affected by alluvial and large-scale gold mining activities. We also assessed heavy metal levels in the surface waters and sediments and in selected aquatic plant species from the reservoir and streams that intersect the gold mining areas. The water quality was acceptable, except for the Cr concentration, which exceeded the World Health Organization (WHO) standard for water contamination. The sediments were contaminated with Cd and Cu in most of the sampling stations along the upstream waters and the reservoir. The Cd concentration in the sediments exceeded the US Environmental Protection Agency’s Sediment Quality Guideline (SQG) values, and the geoaccumulation index (Igeo) values indicated heavy to extreme pollution. In addition, the Cd, Cu, and Pb concentrations in aquatic plants exceeded the WHO guidelines for these contaminants. Between the fish species, tilapia accumulated significantly higher (P < 0.05) Cu in their organ tissues than carp, confirming the bioaccumulation of some metals in the aquatic fauna. The edible muscles of the fish specimens had metal concentrations below the maximum permissible levels established by statutory guidelines. In addition, a human health risk assessment, performed using the estimated weekly intake (EWI) values, indicated that farmed fish from the Yonki Reservoir are safe for human consumption.

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Acknowledgment

The authors are grateful for the funding support from the University of Technology from the Research Committee and Environmental Research and Management Centre that was used to perform this work. We are thankful to Dr. Sailesh Samanta, Department of Surveying and Land Studies for his assistence in the prepartion of map.

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Correspondence to B. K. Rajashekhar Rao.

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Kapia, S., Rao, B.K.R. & Sakulas, H. Assessment of heavy metal pollution risks in Yonki Reservoir environmental matrices affected by gold mining activity. Environ Monit Assess 188, 586 (2016). https://doi.org/10.1007/s10661-016-5604-9

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  • DOI: https://doi.org/10.1007/s10661-016-5604-9

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