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Distribution of total mercury in surface sediments and African catfish(Clarias gariepinus)from Akaki River catchment and Aba Samuel Reservoir,downstream to the mega-city Addis Ababa,Ethiopia

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Emerging Contaminants 2018年第1期4卷 32-39页

作者： Alemnew berhanu Kassegne Jonathan O.Okonkwo tarekegn berhanu Esho Kebede Nigussie Mekonnen Tshia Malehase Seyoum Leta Asfaw Center for Environmental Science Addis Ababa UniversityP.O.Box 1176Addis AbabaEthiopia Department of Chemistry Debre Berhan UniversityP.O.Box 445Debre BerhanEthiopia Department of Environmental Water&Earth SciencesTshwane University of Technology175 Nelson Mandela DrivePrivate Bag X680ArcadiaPretoriaSouth Africa Central Research Laboratory Addis Ababa Science and Technology UniversityP.O.Box 16417AddisAbabaEthiopia Department of Chemistry Tshwane University of TechnologyP.O.Box 56208Arcadia0007South Africa Department of Chemistry College of Natural and Computational SciencesMekelle UniversityP.O.Box 231MekelleEthiopia

Total mercury(THg)levels were determined in sediment(n=22)and muscle of Clarias gariepinus(n=36)in dry and rainy seasons from Akaki River catchment and Aba Samuel Reservoir,Ethiopia in *** analyses of THg were performed using cold vapor-atomic absorption spectrometer(CV-AAS)after acid digestion *** relationship of THg levels to size of the fish has also been *** THg levels in sediments range from 9.5e43.8 mg/kg dry wt in the dry and 20.6e175.4 mg/kg dry wt in the rainy *** study indicated that the levels of THg in sediments varies spatially and *** both seasons,THg levels increased from upstream to downstream areas,revealing increased anthropogenic inputs of mercury *** was also found that the THg concentrations in all the sediment samples were below the US EPA guideline value of 200 mg/kg dry *** THg levels in Clarias gariepinus were in the range from 360e924 mg/kg dry wt in the dry and 325e1233 mg/kg dry wt in the rainy seasons,and had positive relationship to the total length and body *** THg concentrations found in Clarias gariepinus were within the acceptable guidelines of the FAO/***,the muscle of Clarias gariepinus from the study area is not hazardous to human health with respect to ***,the average value of THg seems to be slightly higher than results reported from other Ethiopian freshwater ***,monitoring of mercury species in sediment and different organs of fish are strongly recommended.

关键词： pollution. mercury upstream

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Ecological risk assessment of organochlorine pesticides and polychlorinated biphenyls in water and surface sediment samples from Akaki River catchment,central Ethiopia

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Emerging Contaminants 2020年第1期6卷 396-404页

作者： Alemnew berhanu Kassegne Jonathan O.Okonkwo tarekegn berhanu Adegbenro P.Daso Olubiyi I.Olukunle Seyoum Leta Asfaw Department of Chemistry Debre Berhan UniversityP.O.Box 455Debre BerhanEthiopia Center for Environmental Science Addis Ababa UniversityP.O.Box 1176Addis AbabaEthiopia Department of Environmental Water&Earth SciencesTshwane University of Technology175 Nelson Mandela DrivePrivate Bag X680ArcadiaPretoriaSouth Africa Central Research Laboratory Addis Ababa Science and Technology UniversityP.O.Box 16417Addis AbabaEthiopia School of Public and Environmental Affairs Indiana UniversityBloomingtonIN47405USA

The current status of persistent organic pollutants in Ethiopian environment is not well monitored despite the existing pollution potential from a number of *** and sediment samples collected from Akaki River catchment and Aba Samuel Reservoir,Central Ethiopia were analyzed to assess the concentrations,distribution,possible sources and potential ecological risk of eight organochlorine pesticides(OCPs)and seven polychlorinated biphenyls(PCBs).Water and sediment samples were extracted by liquid-liquid and Soxhlet extraction respectively,and analyzed using gas chromatography-mass spectroscopy(GC-MS).The detectable OCPs and PCBs in water samples were DDT,DDE,DDD,lindane and dieldrin and PCB-28,PCB-101 and PCB-118,respectively in the rainy *** sediment samples showed the presence of lindane in the dry and p,p’-DDT,p,p’-DDE,p,p’-DDD,a,b-endosulfan,heptachlor epoxide(B),and dieldrin in the rainy *** the indicator PCBs analyzed,sediment samples showed the presence of PCB-52,PCB-101 and PCB-118 in the dry and all indicator PCBs in the rainy *** analysis showed that PCBs and detected OCPs were mainly from the historical input of commercial products,but there were recent discharge of DDT and lindane into the river *** risk assessment of the analyzed OCPs and PCBs using water and sediment quality guidelines indicated that lindane in the dry and p’-DDT,p,p’-DDE,p,p’-DDD,heptachlore epoxide and dieldrin in the rainy seasons in the sediment samples from Akaki river and Aba Samuel reservoir were above the limit at most of the *** suggests there is greater possibility of higher ecological hazards in these ***,the levels of total PCB concentrations and other OCPs at all sites were below the limit and thus their potential ecotoxicological risks were rather low.

关键词： Akaki river Organochlorine pesticides Polychlorinated biphenyls Sediment Water

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