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Ward T.J.,ABC Laboratories | Gaertner K.E.,ABC Laboratories | Gaertner K.E.,SynTech Research | Gorsuch J.W.,Copper Development Association Inc | Call D.J.,Environmental Research and Information Analysts
Bulletin of Environmental Contamination and Toxicology | Year: 2015

Leptocheirus plumulosus was exposed for 28 days to Cu-spiked sediment at mean concentrations ranging from 44.4 to 605 mg Cu/kg dry sediment in a sediment/water test system designed to simulate natural conditions. The NOEC (no observed effect concentration)—LOEC (lowest observed effect concentration) range for the most sensitive endpoint of growth was 199–414 mg Cu/kg sediment. An IC50 for reproduction was estimated at 187 mg Cu/kg sediment. Mean Cu concentrations in pore water (PW) where significant effects were observed were 25.8 and 59.0 µg/L, while their respective concentrations in overlying water (OW) were 22.1 and 28.0 µg Cu/L. Copper concentrations were ≤19.1 and <16.6 µg/L in PW and OW, respectively, at lower exposures where effects were not evident. Concentrations of Cu in marine sediment lower than sediment quality guidelines based on geochemical factors of acid volatile sulfide, organic carbon content (fOC), and sediment grain size (i.e., silt + clay) would appear not to result in adverse effects toward L. plumulosus. © 2015 Springer Science+Business Media New York


Ward T.J.,ABC Laboratories | Gaertner K.E.,ABC Laboratories | Gaertner K.E.,SynTech Research | Gorsuch J.W.,Copper Development Association Inc | Call D.J.,Environmental Research and Information Analysts
Bulletin of Environmental Contamination and Toxicology | Year: 2015

Juvenile marine polychaetes, Neanthes arenaceodentata, were exposed for 28 days to copper (Cu)-spiked sediment at six concentrations ranging from 48.3 to 2380 mg Cu/kg dry sediment, plus control. Survival was reduced (p ≤ 0.05) at concentrations ≥1190 mg Cu/kg. Growth was inhibited at Cu concentrations ≥506 mg Cu/kg. Dose–response relationships yielded LC10 and LC50 estimates of 514 and 1230 mg Cu/kg, respectively. The growth effect EC50 estimate was 409 mg Cu/kg. Ranges for the no observable effect concentration and lowest observable effect concentration were 506–1190 mg Cu/kg for survival, and 230–506 mg Cu/kg for growth. Pore water concentrations of Cu were 38.7–65.8 µg Cu/L in exposures where toxic effects were observed, compared to a range of 15.1–22.4 µg Cu/L in exposures where significant effects were not evident. The results of the study were compared with empirical and mechanistic sediment quality guidelines for the protection of benthic organisms. © 2015 Springer Science+Business Media New York


PubMed | Copper Development Association Inc, Environmental Research and Information Analysts and ABC Laboratories
Type: Journal Article | Journal: Bulletin of environmental contamination and toxicology | Year: 2015

Leptocheirus plumulosus was exposed for 28days to Cu-spiked sediment at mean concentrations ranging from 44.4 to 605mg Cu/kg dry sediment in a sediment/water test system designed to simulate natural conditions. The NOEC (no observed effect concentration)-LOEC (lowest observed effect concentration) range for the most sensitive endpoint of growth was 199-414mg Cu/kg sediment. An IC50 for reproduction was estimated at 187mg Cu/kg sediment. Mean Cu concentrations in pore water (PW) where significant effects were observed were 25.8 and 59.0g/L, while their respective concentrations in overlying water (OW) were 22.1 and 28.0g Cu/L. Copper concentrations were 19.1 and <16.6g/L in PW and OW, respectively, at lower exposures where effects were not evident. Concentrations of Cu in marine sediment lower than sediment quality guidelines based on geochemical factors of acid volatile sulfide, organic carbon content (f OC), and sediment grain size (i.e., silt+clay) would appear not to result in adverse effects toward L. plumulosus.

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