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

作     者：Alemnew Berhanu Kassegne Jonathan O.Okonkwo Tarekegn Berhanu Esho Kebede Nigussie Mekonnen Tshia Malehase Seyoum Leta Asfaw 

作者机构：Center for Environmental ScienceAddis Ababa UniversityP.O.Box 1176Addis AbabaEthiopia Department of ChemistryDebre Berhan UniversityP.O.Box 445Debre BerhanEthiopia Department of EnvironmentalWater&Earth SciencesTshwane University of Technology175 Nelson Mandela DrivePrivate Bag X680ArcadiaPretoriaSouth Africa Central Research LaboratoryAddis Ababa Science and Technology UniversityP.O.Box 16417AddisAbabaEthiopia Department of ChemistryTshwane University of TechnologyP.O.Box 56208Arcadia0007South Africa Department of ChemistryCollege of Natural and Computational SciencesMekelle UniversityP.O.Box 231MekelleEthiopia 

出 版 物：《Emerging Contaminants》 (新兴污染物（英文）)

年 卷 期：2018年第4卷第1期

页      面：32-39页

学科分类：08[工学] 0815[工学-水利工程] 

基　　金：Tshwane University of Technology, Pretoria Addis Ababa University, AAU 

主　　题：pollution. mercury upstream 

摘      要：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.