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

作     者：Alemnew Berhanu Kassegne Jonathan O.Okonkwo Tarekegn Berhanu Adegbenro P.Daso Olubiyi I.Olukunle Seyoum Leta Asfaw 

作者机构：Department of ChemistryDebre Berhan UniversityP.O.Box 455Debre BerhanEthiopia Center for Environmental ScienceAddis Ababa UniversityP.O.Box 1176Addis AbabaEthiopia Department of EnvironmentalWater&Earth SciencesTshwane University of Technology175 Nelson Mandela DrivePrivate Bag X680ArcadiaPretoriaSouth Africa Central Research LaboratoryAddis Ababa Science and Technology UniversityP.O.Box 16417Addis AbabaEthiopia School of Public and Environmental AffairsIndiana UniversityBloomingtonIN47405USA 

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

年 卷 期：2020年第6卷第1期

页      面：396-404页

学科分类：1007[医学-药学(可授医学、理学学位)] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 1004[医学-公共卫生与预防医学(可授医学、理学学位)] 1001[医学-基础医学(可授医学、理学学位)] 08[工学] 0815[工学-水利工程] 

主　　题：Akaki river Organochlorine pesticides Polychlorinated biphenyls Sediment Water 

摘      要：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.