Effects of water hardness on the toxicity of manganese to developing brown trout (Salmo trutta)

Journal Article · Wed Oct 01 04:00:00 EDT 1997 · Environmental Toxicology and Chemistry

DOI:https://doi.org/10.1002/etc.5620161014· OSTI ID:563985

Stubblefield, W A; Garrison, T D; Hockett, J R ^[1]; Brinkman, S F; Davies, P H; McIntyre, M W ^[2]

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1. ENSR Corp., Fort Collins, CO (United States)
2. Colorado Div. of Wildlife, Fort Collins, CO (United States)

Manganese is a common constituent of point and nonpoint discharges from mining and smelting activities. Available data indicate that Mn is acutely toxic at relatively high aqueous concentrations, when compared with trace metals, and its toxicity is affected by water hardness. Little information is available regarding the chronic toxicity of manganese. Early-life-stage (ELS) tests were conducted to determine the toxicity of manganese to brown trout (Salmo trutta) and to evaluate the extent to which water hardness (ranging from 30 to 450 mg/L as CaCO{sub 3}) affects the chronic toxicity of Mn. Water hardness of significantly affected Mn chronic toxicity, with toxicity decreasing with increasing hardness. Decreased survival was the predominant effect noted in the 30-mg/L hardness experiment, while significant effects on growth (as measured by changes in body weight) were observed in both the 150- and 450-mg/L hardness experiments. Twenty-five percent inhibition concentration (IC25) values, based on the combined endpoints (i.e., survival and body weight), were 4.67, 5.59, and 8.68 mg Mn/L (based on measured Mn concentration) at hardness levels of approximately 30, 150, and 450 mg/L as CaCO{sub 3}, respectively.

• Sponsoring Organization: USDOE
• OSTI ID: 563985
• Journal Information: Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 10 Vol. 16; ISSN ETOCDK; ISSN 0730-7268
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
56 BIOLOGY AND MEDICINE
APPLIED STUDIES
BIOLOGICAL INDICATORS
CALCIUM CARBONATES
MANGANESE
TOXICITY
TROUT
WATER POLLUTION