title: Toxicity assessment of total dissolved solids in effluent of Alaskan mines using 22-h chronic Microtox and Selenastrum capricornutum assays.
abstract: In order to overcome limitations associated with the Daphnia assay, we have explored two alternative assays, the 22-h chronic Microtox test and the 3-day S. capricornutum test, as substitutes. During this study, we compared the two assays using both a simple TDS standard solution and field water samples from two Alaskan mines. Using EC20 values, our results suggest that simple TDS standard solutions are not representative of environmental water samples of equivalent TDS concentrations. When comparing assays, our results showed that the 22-h Microtox assay was more reproducible and sensitive to effluent waters than the algal assay. Principle component analysis indicated that the 22-h Microtox test was generally more sensitive to nickel, ammonia and chloride while the S. capricornutum growth test appeared sensitive to cadmium levels.
authors.affiliation: Institute of Arctic Biology and the Department of Chemistry and Biochemistry, University of Alaska Fairbanks, 99775, USA.
authors.forename: J B
authors.initials: JB
authors.lastname: LeBlond
authors.forename: L K
authors.initials: LK
authors.lastname: Duffy
mesh_terms: D001419:Bacteria / Q000187:drug effects; D001681:Biological Assay / Q000379:methods; D000460:Chlorophyta / Q000187:drug effects* / Q000502:physiology; D008163:Luminescent Measurements; D019216:Metals, Heavy / Q000633:toxicity*; D008906:Mining; D012680:Sensitivity and Specificity; D018675:Toxicity Tests; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical