（英文污水文献）1-s2.0-S0045653518320447-main

1-s2.0-S0045653518320447-mainSeasonalvariations,riskassessmentandmultivariateanalysisoftracemetalsinthefreshwaterreservoirsofPakistanMuhammadSaleem,JavedIqbal,MunirH.Shah*DepartmentofChemistry,Quaid-i-AzamUniversity,Islamabad45320,Pakistanhighlights�Significantspatialandtemporalvariabilitywasobservedinwaterreservoirs.�Sometoxictracemetalsexceededthepermissiblelimitsandreportedlevels.�MultivariateanalysisrevealedanthropogenicintrusionsofCd,Co,Cr,NiandPb.�Pollutionassessmenthighlightedmediumlevelpollutioninthewaterreservoirs.�Non-carcinogenicriskwasmostlyassociatedwithCd,Cr,Co,NiandPb.articleinfoArticlehistory:Received11May2018Receivedinrevisedform28September2018Accepted24October2018Availableonline29October2018Keywords:MetalWaterMultivariateanalysisRiskassessmentPollutionPakistanabstractWatersampleswerecollectedfromthreefreshwaterreservoirsofPakistanduringthreeseasons(pre-monsoon,monsoonandpost-monsoon).Thecollectedsampleswereexaminedfortheconcentrationsofselectedtracemetals(Cd,Co,Cr,Cu,