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Copper toxicity in Bristol Bay headwaters: Part 1-Acute mortality and ambient water quality criteria in low-hardness water.
https://arctichealth.org/en/permalink/ahliterature299742
Source
Environ Toxicol Chem. 2019 01; 38(1):190-197
Publication Type
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Date
01-2019
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Author
Jeffrey M Morris
Stephen F Brinkman
Michael W Carney
Joshua Lipton
Author Affiliation
Abt Associates, Boulder, Colorado, USA.
Source
Environ Toxicol Chem. 2019 01; 38(1):190-197
Date
01-2019
Language
English
Publication Type
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Keywords
Alaska
Animals
Bays
Biological Assay
Copper - toxicity
Cyprinidae - physiology
Fresh Water
Hardness
Ligands
Oncorhynchus mykiss - physiology
Toxicity Tests
Water - chemistry
Water Pollutants, Chemical - toxicity
Water Quality
Abstract
The world-class Alaskan Bristol Bay salmon fishery and vast deposits of copper (Cu) and other metals in the watershed warrant further investigation into the potential toxicity of Cu to salmonids under the low water-hardness conditions that occur in the watershed. Therefore we investigated the acute toxicity of Cu to rainbow trout (Oncorhynchus mykiss) and fathead minnows (Pimephales promelas) in low-hardness water (~ 30?mg/L as CaCO3 ) formulated in the laboratory and collected from the Bristol Bay watershed. The median lethal concentration (LC50) for rainbow trout exposed to Cu in low-hardness laboratory water was 16?µg Cu/L (95% confidence intervals [CIs]: 12, 21; dissolved Cu, filtered to 0.45?µm). The LC50 values for fathead minnows exposed to Cu in low-hardness laboratory water or site water were 29 and 79?µg Cu/L (95% CIs: 23, 35 and 58, 125; dissolved Cu), respectively. The biotic ligand model (BLM) LC50 estimates for these bioassays were 1.3 to 2.3 times higher than the actual LC50 values. We also calculated and analyzed acute Cu water quality criteria, also known as criterion maximum concentration (CMC), using hardness-based methods and the BLM for water samples collected throughout the Bristol Bay watershed in 2007. Biotic ligand model CMCs ranged from 0.05 to 17.5?µg Cu/L and hardness-based CMCs ranged from 2.3 to 6.1?µg Cu/L for the 65 samples analyzed. Our results show the need for site-specific research and subsequent water quality guidelines in low-hardness aquatic habitats. Environ Toxicol Chem 2019;38:190-197. © 2018 SETAC.
PubMed ID
30125979
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