effects of humic substances on copper toxicity to Ceriodaphnia silvestrii Daday (Crustacea, Cladocera)

A major question in the field of ecotoxicology is how DOM affects copper accumulation and toxicity in planktonic organisms; copper acute toxicity and bioaccumulation in Ceriodaphnia silvestrii were investigated in the presence and absence of humic substances (HS) under controlled laboratory conditio...

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Published in:	Ecotoxicology (London) Vol. 17; no. 6; pp. 449 - 454
Main Authors:	Santos, M. A. P. F, Melão, M. G. G, Lombardi, A. T
Format:	Journal Article
Language:	English
Published:	Boston Boston : Springer US 01-08-2008 Springer US Springer Nature B.V
Subjects:	Acute toxicity Animals Bioaccumulation Ceriodaphnia Cladocera Copper Copper - analysis Copper - metabolism Copper - toxicity Crustacea Daphnia - drug effects Daphnia - physiology Dose-Response Relationship, Drug Drug Combinations Earth and Environmental Science Ecology Ecotoxicology Environment Environmental Exposure Environmental Management Female Humic Substances - toxicity Longevity - drug effects Toxicity Tests Water Pollutants, Chemical - analysis Water Pollutants, Chemical - metabolism Water Pollutants, Chemical - toxicity Zooplankton Free copper ions DOM Toxicity Bioaccumulation
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Summary:	A major question in the field of ecotoxicology is how DOM affects copper accumulation and toxicity in planktonic organisms; copper acute toxicity and bioaccumulation in Ceriodaphnia silvestrii were investigated in the presence and absence of humic substances (HS) under controlled laboratory conditions. Copper was determined as free Cu²⁺ ions in the media and total copper in the animals; metal ion buffers were used for ion selective electrode calibration, extending the lower detection limit to 10⁻¹¹ mol l⁻¹. Groups of 20 adult females of similar sizes were exposed (24 h) to a range of nominal copper concentrations. Based on total added copper, LC₅₀ was 4.4 x 10⁻⁸ mol l⁻¹ without HS, whereas with 20 mg l⁻¹ HS, it was 25 times higher (1.1 x 10⁻⁶ mol l⁻¹). Based on free Cu²⁺ ions LC₅₀ was statistically similar either with (2.8 x 10⁻⁸ mol l⁻¹) or without HS (3.3 x 10⁻⁸ mol l⁻¹). The present results showed that natural DOM reduced copper toxicity and that free Cu²⁺ ions correlates to the bioavailable fraction to zooplankton. Nevertheless, copper bioaccumulation by C. silvestrii was similar either in the presence or absence of humic substances, suggesting that C. silvestrii regulates its body copper content up to 3.0 x 10⁻⁸ mol l⁻¹ free Cu²⁺ ions in the media. The organisms were not able to deal with higher free Cu²⁺ ions concentrations in the media.
Bibliography:	http://dx.doi.org/10.1007/s10646-008-0196-y ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1
ISSN:	0963-9292 1573-3017
DOI:	10.1007/s10646-008-0196-y