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Influence of clay content on bioavailability of copper in the earthworm Eisenia fetida.

Abstract：

:We investigated the effect of clay content on the bioavailability of copper to the earthworm Eisenia fetida, in the laboratory for 28 days using OECD artificial soil adjusted to 5%, 20% and 40% clay. Mortality, growth, cocoon production and internal copper concentrations were assessed in worms, and total, DTPA and CaCl(2) extractable copper in the substrates were also determined. The results showed that with increased clay content, there was significant reduction in internal Cu concentration of worms as well as toxicity of copper as shown by data for growth and mortality. However, internal copper concentrations of worms could not explain fully the observed toxicity in this study probably because of Cu regulation. Among the three extraction methods, DTPA extraction revealed the strongest relationship between partitioning and toxicity of Cu in this study. DTPA extract is thus a promising surrogate measure of bioavailability of Cu to earthworms. It is concluded that clay content has significant influence on the bioavailability of copper to earthworms and other similar species.

journal_name

Ecotoxicol Environ Saf

journal_title

Ecotoxicology and environmental safety

authors

Owojori OJ,Reinecke AJ,Rozanov AB

doi

10.1016/j.ecoenv.2009.03.017

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

407-14

issue

3

eissn

0147-6513

issn

1090-2414

pii

S0147-6513(09)00056-6

journal_volume

73

pub_type

杂志文章

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