Dietary bioavailability of Cu adsorbed to colloidal hydrous ferric oxide

Environmental Science & Technology
By: , and 



The dietary bioavailability of copper (Cu) adsorbed to synthetic colloidal hydrous ferric oxide (HFO) was evaluated from the assimilation of 65Cu by two benthic grazers, a gastropod and a larval mayfly. HFO was synthesized, labeled with 65Cu to achieve a Cu/Fe ratio comparable to that determined in naturally formed HFO, and then aged. The labeled colloids were mixed with a food source (the diatom Nitzschia palea) to yield dietary 65Cu concentrations ranging from 211 to 2204 nmol/g (dry weight). Animals were pulse fed the contaminated diet and assimilation of 65Cu from HFO was determined following 1–3 days of depuration. Mass transfer of 65Cu from HFO to the diatom was less than 1%, indicating that HFO was the source of 65Cu to the grazers. Estimates of assimilation efficiency indicated that the majority of Cu ingested as HFO was assimilated (values >70%), implying that colloidal HFO potentially represents a source of dietary Cu to benthic grazers, especially where there is active formation and infiltration of these particles into benthic substrates.
Publication type Article
Publication Subtype Journal Article
Title Dietary bioavailability of Cu adsorbed to colloidal hydrous ferric oxide
Series title Environmental Science & Technology
DOI 10.1021/es3044856
Volume 47
Issue 6
Year Published 2013
Language English
Publisher ACS Publications
Contributing office(s) National Research Program - Western Branch
Description 8 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Environmental Science and Technology
First page 2869
Last page 2876
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