2012i-817 analysis animals ecologicalriskassessment ecology effectofchemicalson effectofpollutionon effectofwaterpollutionon engineering environment environmental environmentalaspects environmentalexposure environmentalpollutants environmentaltoxicology general healthaspects marineecology marineorganisms mercury nat010000 nature perfluorinatedchemicals persistentpollutants qv293 riskassessment technology toxicity toxicitytesting toxicology wa671 waterqualitybioassay