Distribution of trace elements in the aquatic ecosystem of the Thigithe river and the fish Labeo victorianus in Tanzania and possible risks for human consumption

The Science of the Total Environment
Gordian Rocky MatabaL Bervoets

Abstract

The aim of the present study was to assess the distribution of trace elements in the aquatic ecosystem of the Thigithe river. Samples of surface water, sediment and fish were collected up- and downstream of the North Mara Gold Mine (Tanzania) and following trace elements were analysed: As, Cd, Co, Cr, Cu, Hg, Ni, Pb and Zn. Trace element concentrations in surface water were below or near the detection limit. Regarding the sediments, relative high concentrations of arsenic at all sites and high levels of mercury at a site downstream of the mine where artisanal mining is performed were observed. Trace element concentrations in Ningu fish tissues (Labeo victorianus) were comparable to slightly higher than levels in fishes from unpolluted environments. For none of the measured human health risk by consumption of fish from the Thigithe river is expected when the Tanzanian average amount of 17 g/day is consumed. However, for Hg and As the advised maximum daily consumption of Ningu fish was lower than 100g. As a result fishermen and people living along the shores of the river consuming more fish than the average Tanzanian fish consumption set by the FAO (2005) are possibly at risk.

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Citations

May 7, 2016·The Science of the Total Environment·Bertram BoehrerJavier Sanchez-España
Nov 9, 2016·Chemosphere·Mayerly Alexandra Oyuela LeguizamoMartha Cecilia Gutiérrez Sarmiento
Dec 12, 2019·Environmental Technology·Wenquan YangJiancun Kou
Jan 29, 2020·Bulletin of Environmental Contamination and Toxicology·T DubeT Muteveri
Apr 28, 2019·Environmental Science and Pollution Research International·Farhana Ahmad Affandi, Mohd Yusoff Ishak
Dec 10, 2016·Bulletin of Environmental Contamination and Toxicology·Semra Benzer
Jul 20, 2019·Environmental Science and Pollution Research International·Jiancai DengXiaolong Wang
Nov 4, 2017·Environmental Science and Pollution Research International·Lesly Tejeda-BenítezJesus Olivero-Verbel
Oct 23, 2020·Environmental Monitoring and Assessment·Mihayo S NkindaKaroli N Njau
Jun 9, 2021·Journal of Environmental Management·Marco Mng'ong'oThomas H Hutchinson
Dec 31, 2019·The Science of the Total Environment·Matheus da Silva FerreiraJosé Zilton Lopes Santos
Jun 13, 2021·Journal of Environmental Management·Marco Mng'ong'oThomas H Hutchinson

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