Prospective mixture risk assessment and management prioritizations for river catchments with diverse land uses.

ABSTRACT: Ecological risk assessment increasingly focuses on risks from chemical mixtures and multiple stressors because ecosystems are commonly exposed to a plethora of contaminants and nonchemical stressors. To simplify the task of assessing potential mixture effects, we explored 3 land use-related chemical emission scenarios. We applied a tiered methodology to judge the implications of the emissions of chemicals from agricultural practices, domestic discharges, and urban runoff in a quantitative model. The results showed land use-dependent mixture exposures, clearly discriminating downstream effects of land uses, with unique chemical "signatures" regarding composition, concentration, and temporal patterns. Associated risks were characterized in relation to the land-use scenarios. Comparisons to m

SUBMITTER: Posthuma L 

PROVIDER: S-EPMC5873277 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature