Kinetics and body distribution of waterborne 65Zn(II), 109Cd(II), 203Hg(II), and Ch320Hg(II) in phantom midge larvae (chaoborus americanus) and effects of complezing agents
Article Abstract:
The uptake, body-distribution and elimination of waterborne 65Zn(II), 203Hg(II), and CH3203Hg(II) were reviewed in fourth instar larvae of phantom midge, Chaoborus americanus using a two-compartment kinetic model and whole-body autoradiography (WBARG). Sodium diethyldithiocarbamate (DDC) and humic material (HK) complexation effects were also studied. After a one-week exposure, uptake of Hg(II) and CH3hg(II) from water was 20 to 240 times higher than Cd(II) and Zn(II). DDC also doubled uptake forms of Hg forms probably because of lipophilic complexes formation. HM increased CH3Hg(II) uptake by 30%, but decreased uptake rate of Hg(II) by 50%.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1998
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Response to comment of 'determination of metal (Bi)sulfide stability constants of Mn2+, Fe2+, Co2+, Ni2+, Cu2+, and Zn2+ by voltammetric methods'
Article Abstract:
William Davidson's comments on the determination of the stability constants of metal sulfides were erroneous because his assumptions were based on comparisons with the stability constants of organic ligands with sulfur. The use of the DeFord and Hume approach is appropriate for the analysis of stability constants in reactions between uncomplexed and complexed metal species. Furthermore, analysis of beta values in acid-base titrations of sulfide with metals indicated the presence of HS- complexes in highly acidic solutions.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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Comment on 'Determination of metal (Bi)sulfide stability constants of Mn2+, Fe2+, Co2+, Ni2+, Cu2+, and Zn2+ by voltametric methods'
Article Abstract:
Luther et al.'s assumptions on the stability constants of metal sulfides during voltammetrical analysis are not valid because they are not within the measurable range of reversibility conditions. Luther et al. also utilized excessive concentrations of ligands which produced erroneous results. Furthermore, the stability constants for metal sulfides did not correlate to the stability constants of organic ligands with sulfur binding atoms that contain multiple binding sites.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1996
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