NDLI: Manganese toxicity to tropical freshwater species in low hardness water

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Harford, Andrew J. Mooney, Thomas J. Trenfield, Melanie A. Van Dam, Rick A.
Spatial Coverage	Australia
Description	Country affiliation: Australia Author Affiliation: Harford AJ ( Department of the Environment, Environmental Research Institute of the Supervising Scientist, Darwin, Northern Territory, Australia.); Mooney TJ ( Department of the Environment, Environmental Research Institute of the Supervising Scientist, Darwin, Northern Territory, Australia.); Trenfield MA ( Department of the Environment, Environmental Research Institute of the Supervising Scientist, Darwin, Northern Territory, Australia.); van Dam RA ( Department of the Environment, Environmental Research Institute of the Supervising Scientist, Darwin, Northern Territory, Australia.)
Abstract	Elevated manganese (Mn) is a common contaminant issue for mine water discharges, and previous studies have reported that its toxicity is ameliorated by $H^{+},$ $Ca^{2+},$ and $Mg^{2+}$ 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. Published by Wiley Periodicals, Inc. on behalf of SETAC.
File Format	HTM / HTML
ISSN	07307268
Issue Number	12
Volume Number	34
e-ISSN	15528618
Journal	Environmental Toxicology and Chemistry
Language	English
Publisher	Wiley
Publisher Date	2015-12-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Water Pollutants, Chemical Water Toxicity Discipline Environmental Health Cladocera Discipline Toxicology Drug Effects Hydra Journal Article Aquatic Organisms Growth & Development Chemistry Animals Araceae Chlorophyta Tropical Climate Perciformes Discipline Chemistry Fresh Water Australia Toxicity Tests Manganese
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis

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