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Manganese toxicity to tropical freshwater species in low hardness water

Harford, Andrew J., Mooney, Thomas J., Trenfield, Melanie A. and van Dam, Rik A. (2015). Manganese toxicity to tropical freshwater species in low hardness water. Environmental Toxicology and Chemistry,34(12):2856-2863.

Document type: Journal Article
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IRMA ID 84376995xPUB266
Title Manganese toxicity to tropical freshwater species in low hardness water
Author Harford, Andrew J.
Mooney, Thomas J.
Trenfield, Melanie A.
van Dam, Rik A.
Journal Name Environmental Toxicology and Chemistry
Publication Date 2015
Volume Number 34
Issue Number 12
ISSN 0730-7268   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-84950122139
Start Page 2856
End Page 2863
Total Pages 8
Place of Publication United States
Publisher John Wiley & Sons, Inc.
HERDC Category C1 - Journal Article (DIISR)
Abstract Elevated manganese (Mn) is a common contaminant issue for mine water discharges, and previous studies have reported that its toxicity is ameliorated by H+, Ca2+, and Mg2+ ions. In the present study, the toxicity of Mn was assessed in a high risk scenario, that is, the slightly acidic, soft waters of Magela Creek, Kakadu National Park, Northern Territory, Australia. Toxicity estimates were derived for 6 tropical freshwater species (Chlorella sp., Lemna aequinoctialis, Amerianna cumingi, Moinodaphnia macleayi, Hydra viridissima, and Mogurnda mogurnda). Low effect chronic inhibition concentration (IC10) and acute lethal concentration (LC05) values ranged between 140 μg L–1 and 80 000 μg L–1, with 3 of the species tested (M. macleayi, A. cumingi, and H. viridissima) being more sensitive to Mn than all but 1 species in the international literature (Hyalella azteca). A loss of Mn was observed on the final day for 2 of the H. viridissima toxicity tests, which may be a result of the complex speciation of Mn and biological oxidation. International data from toxicity tests conducted in natural water with a similar physicochemistry to Magela Creek water were combined with the present study's data to increase the sample size to produce a more reliable species sensitivity distribution. A 99% protection guideline value of 73 μg L–1 (33−466 μg L–1) was derived; the low value of this guideline value reflects the higher toxicity of Mn in slightly acidic soft waters. Environ Toxicol Chem 2015;34:2856–2863. © 2015 Commonwealth of Australia.
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