title: Investigating the significance of dissolved organic contaminants in aquatic environments: coupling passive sampling with in vitro bioassays.
abstract: We investigated the feasibility of coupling passive sampling and in vitro bioassay techniques for both chemical and ecotoxicological assessment of complex mixtures of organic contaminants in water. Silicone rubber passive sampling devices (SR-PSDs) were deployed for 8-9 weeks in four streams and an estuary of an agricultural catchment in North East (NE) Scotland. Extracts from the SR-PSDs were analysed for freely dissolved hydrophobic organic contaminants (HOCs) and screened for wide range of pesticides. The total concentrations of dissolved PAHs (∑PAH(40), parent and branched) in the water column of the catchment varied from 38 to 69 ng L(-1), whilst PCBs (∑PCB(32)) ranged 0.02-0.06 ng L(-1). A number and level of pesticides and acid/urea herbicides of varying hydrophobicity (logK(OW)s ~2.25 to ~5.31) were also detected in the SR extracts, indicating their occurrence in the catchment. The acute toxicity and EROD induction potentials of SR extracts from the study sites were evaluated with rainbow trout liver (Oncorhynchus mykiss; RTL-W1) cell line. Acute cytotoxicity was not observed in cells following 48 h exposure to the SR extracts using neutral red uptake assay as endpoint. But, on a sublethal level, for every site, statistically significant EROD activity was observed to some degree following 72 h exposure to extracts, indicating the presence of compounds with dioxin-like effect that are bioavailable to aquatic organisms in the water bodies of the catchment. Importantly, only a small fraction of the EROD induction could be attributed to the PAHs and PCBs that were determined. This preliminary study demonstrates that the coupling of silicone rubber passive sampling techniques with in vitro bioassays is feasible and offers a cost effective early warning signal on water quality deterioration.
authors: Marine Scotland Science (Marine Laboratory), 375 Victoria Road, Aberdeen AB11 9DB, UK. Emmanuel.Emelogu@scotland.gsi.gov.uk
authors: Emmanuel S
authors: ES
authors: Emelogu
authors: Pat
authors: P
authors: Pollard
authors: Craig D
authors: CD
authors: Robinson
authors: Foppe
authors: F
authors: Smedes
authors: Lynda
authors: L
authors: Webster
authors: Ian W
authors: IW
authors: Oliver
authors: Craig
authors: C
authors: McKenzie
authors: T B
authors: TB
authors: Seiler
authors: Henner
authors: H
authors: Hollert
authors: Colin F
authors: CF
authors: Moffat
mesh_terms: D000818:Animals; D019363:Cytochrome P-450 CYP1A1 / Q000378:metabolism; D004147:Dioxins / Q000032:analysis / Q000633:toxicity; D004784:Environmental Monitoring / Q000295:instrumentation / Q000379:methods*; D005618:Fresh Water / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D017686:Oncorhynchus mykiss / Q000378:metabolism; D009930:Organic Chemicals / Q000032:analysis* / Q000633:toxicity; D010575:Pesticides / Q000032:analysis / Q000633:toxicity; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000633:toxicity; D012606:Scotland; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000633:toxicity
chemical_list: D004147:Dioxins; D009930:Organic Chemicals; D010575:Pesticides; D011084:Polycyclic Aromatic Hydrocarbons; D014874:Water Pollutants, Chemical; D019363:Cytochrome P-450 CYP1A1