Copper speciation and toxicity in Macquarie Harbour, Tasmania: an investigation using a copper ion selective electrode

Growth inhibition bioassays using Nitzschia closterium were used to determine the relationship between the reduction in the growth rate and the concentration of free copper ion (Cu free) as measured with a copper Ion-Selective Electrode (ISE). At a salinity of 20, no toxicity was found for Cu free=1...

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Published in:Marine chemistry 2001-05, Vol.74 (2), p.99-113
Main Authors: Eriksen, Ruth S, Mackey, Denis J, van Dam, Rick, Nowak, Barbara
Format: Article
Language:English
Subjects:
Algae
Australia, Tasmania
Copper
Earth sciences
Earth, ocean, space
Exact sciences and technology
External geophysics
Geochemistry
Ion-selective electrode
Mineralogy
Nitzschia closterium
Physical and chemical properties of sea water
Physics of the oceans
Silicates
Speciation
Toxicity
Water geochemistry
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cited_by cdi_FETCH-LOGICAL-a389t-61546e325995719aa83e9ff88a411b962a9e999a8e9c67dca12c9fc905193223
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container_title Marine chemistry
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creator Eriksen, Ruth S
Mackey, Denis J
van Dam, Rick
Nowak, Barbara
description Growth inhibition bioassays using Nitzschia closterium were used to determine the relationship between the reduction in the growth rate and the concentration of free copper ion (Cu free) as measured with a copper Ion-Selective Electrode (ISE). At a salinity of 20, no toxicity was found for Cu free=10 −11.79 M while, for Cu free=10 −8.20 M, the growth rate was reduced to
doi_str_mv 10.1016/S0304-4203(00)00117-1
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At a salinity of 20, no toxicity was found for Cu free=10 −11.79 M while, for Cu free=10 −8.20 M, the growth rate was reduced to &lt;8% of the control. Copper was found to be less toxic at S=30 and the growth rate was reduced to 40% of the control at Cu free=10 −8.50 M. These results are comparable to other estimates of the toxicity of copper to marine organisms. Macquarie Harbour is a large semi-enclosed bay that is heavily polluted with copper and measurements of Cu free, using an ISE, ranged from 10 −11.27 to 10 −12.04 M even though total copper concentrations were as high as 390 nM. In line with these low concentrations of Cu free, Macquarie Harbour waters ( S=20) were not found to be toxic to N. closterium. A reduction in growth rate was observed in some Macquarie Harbour waters at S=30 but this was attributed to some factor other than copper toxicity. These results are in direct contrast with ASV measurements, which predicted high toxicity for all water samples. 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At a salinity of 20, no toxicity was found for Cu free=10 −11.79 M while, for Cu free=10 −8.20 M, the growth rate was reduced to &lt;8% of the control. Copper was found to be less toxic at S=30 and the growth rate was reduced to 40% of the control at Cu free=10 −8.50 M. These results are comparable to other estimates of the toxicity of copper to marine organisms. Macquarie Harbour is a large semi-enclosed bay that is heavily polluted with copper and measurements of Cu free, using an ISE, ranged from 10 −11.27 to 10 −12.04 M even though total copper concentrations were as high as 390 nM. In line with these low concentrations of Cu free, Macquarie Harbour waters ( S=20) were not found to be toxic to N. closterium. A reduction in growth rate was observed in some Macquarie Harbour waters at S=30 but this was attributed to some factor other than copper toxicity. These results are in direct contrast with ASV measurements, which predicted high toxicity for all water samples. 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source ScienceDirect Journals
subjects Algae
Australia, Tasmania
Copper
Earth sciences
Earth, ocean, space
Exact sciences and technology
External geophysics
Geochemistry
Ion-selective electrode
Mineralogy
Nitzschia closterium
Physical and chemical properties of sea water
Physics of the oceans
Silicates
Speciation
Toxicity
Water geochemistry
title Copper speciation and toxicity in Macquarie Harbour, Tasmania: an investigation using a copper ion selective electrode
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