| Title: | "The leachability, bioaccessibility, and speciation of Cu in the sediment of channel catfish ponds" |
| Address: | "Environmental Engineering Program, Civil Engineering Department, Auburn University, 238 Harbert Engineering Center, Auburn, AL 36849, USA. liuruiq@auburn.edu" |
| DOI: | 10.1016/j.envpol.2006.10.011 |
| ISSN/ISBN: | 0269-7491 (Print) 0269-7491 (Linking) |
| Abstract: | "There have been growing concerns about the environmental impact of Cu applied in the catfish pond aquaculture. In this paper, sediments taken from three commercial catfish ponds were studied for content, leachability, bioaccessibility, and speciation of sediment-bound Cu. Results showed that the Cu was concentrated in the top 10 cm of the sediments and the peak Cu concentrations ranged from the background level to about 200 mg/kg. Toxicity characteristic leaching procedure showed only 1-8% of sediment Cu was leachable while bioaccessible Cu, evaluated by physiological based extraction test, accounted for up to 40-85% of total Cu. Due to the high redox potential in the surface sediments, acid-volatile sulfide was not a significant binding phase. The sequential extraction results showed that the residual phase (forms in lattices of primary and secondary minerals) was the major Cu fraction in the first two pond sediments but carbonate-bound, Fe/Mn oxide-bound and organically bound Cu, as well as the residual fraction, seemed equally important in the third pond" |
| Keywords: | Animals Carbonates/chemistry Copper/analysis/*chemistry Ecosystem Environmental Exposure/adverse effects Environmental Monitoring/methods Ferric Compounds/chemistry Fisheries Geologic Sediments/*analysis Ictaluridae/*metabolism Manganese Compounds/chemist; |
| Notes: | "MedlineLiu, Ruiqiang Zhao, Dongye eng Research Support, Non-U.S. Gov't England 2006/12/02 Environ Pollut. 2007 Jun; 147(3):593-603. doi: 10.1016/j.envpol.2006.10.011. Epub 2006 Nov 28" |
