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Occurrence and risk evaluation of organochlorine contaminants in surface water along the course of Swartkops and Sundays River Estuaries, Eastern Cape Province, South Africa

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Abstract

Organochlorine contaminants were analysed in surface water from Sundays (SDE) and Swartkops Estuaries (SWE), Eastern Cape Province, which is among the largest estuaries in South Africa. The concentration of Σ18OCPs ranged from 16.7 to 249.2 ng/L in autumn, 19.9–81.4 ng/L in winter, 43.6–126.8 ng/L in spring and 68.3–199.9 ng/L in summer for SDE, whereas in SWE, the values varied from 20.9 to 259.7 ng/L in autumn, 58.9–263.9 ng/L in winter, 3.2–183.6 ng/L in spring and 118.0–188.9 ng/L in summer. Among all OCPs, α-HCH, β-HCH, p,p′-DDE, p,p′-DDT, endrin, dieldrin and endrin aldehyde were predominant in surface water samples from SDE and SWE. Furthermore, the mean concentration of polychlorinated biphenyls (PCBs) ranged from 126.7 ng/L in winter to 151.0 ng/L in spring for SDE and 249.0 ng/L in spring to 727.6 ng/L in winter for SWE. Tri- and tetra-PCBs dominated the PCB homologue profile. Hierarchical cluster analysis grouped the study sites into three regions from least polluted to most polluted, indicated that SWE is more polluted compared to SDE, probably due to the influx of agricultural and industrial effluents. Carcinogenic and non-carcinogenic risk assessment revealed that the water from both estuaries is not safe for drinking, although suitable for bathing.

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  1. Department of Pure and Applied Chemistry, University of Fort Hare, Alice, 5700, South Africa

    Chijioke Olisah, Abiodun O. Adeniji & Omobola O. Okoh

  2. Applied and Environmental Microbiology Research Group (AEMREG), Alice, 5700, South Africa

    Chijioke Olisah, Abiodun O. Adeniji, Omobola O. Okoh & Anthony I. Okoh

  3. SAMRC, Microbial Water Quality Monitoring Centre, University of Fort Hare, Alice, 5700, South Africa

    Chijioke Olisah, Abiodun O. Adeniji, Omobola O. Okoh & Anthony I. Okoh

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Olisah, C., Adeniji, A.O., Okoh, O.O. et al. Occurrence and risk evaluation of organochlorine contaminants in surface water along the course of Swartkops and Sundays River Estuaries, Eastern Cape Province, South Africa. Environ Geochem Health 41, 2777–2801 (2019). https://doi.org/10.1007/s10653-019-00336-0

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