Bismuth solubility through binding by various organic compounds and naturally occurring soil organic matter

The present study was performed to examine the effects of soluble organic matter and pH on the solubility of Bi in relation to inference with the behavior of metallic Bi dispersed in soil and water environments using EDTA, citric acid, tartaric acid, l-cysteine, soil humic acids (HA), and dissolved...

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Bibliographic Details
Published in:Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering Toxic/hazardous substances & environmental engineering, 2010-05, Vol.45 (6), p.746-753
Main Author: Murata, Tomoyoshi
Format: Article
Language:English
Subjects:
Applied sciences
Binding
Bismuth
Bismuth - chemistry
Citric acid
complex
EDTA
Effects
Environmental science
Exact sciences and technology
functional group
Functional groups
humic acid
Humic Substances
Hydrogen-Ion Concentration
Hydroxyapatite
Molecules
naturally occurring DOM
Organic Chemicals - chemistry
pH dependence
Pollution
Precipitation
Soil
Soil (material)
soil organic matter
Soils
Solubility
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Summary:The present study was performed to examine the effects of soluble organic matter and pH on the solubility of Bi in relation to inference with the behavior of metallic Bi dispersed in soil and water environments using EDTA, citric acid, tartaric acid, l-cysteine, soil humic acids (HA), and dissolved organic matter (DOM) derived from the soil organic horizon. The solubility of Bi by citric acid, tartaric acid, l-cysteine, HA, and DOM showed pH dependence, while that by EDTA did not. Bi solubility by HA seemed to be related to the distribution of pKa (acid dissociation constant) values of acidic functional groups in their molecules. That is, HA extracted at pH 3.2 solubilized Bi preferentially in the acidic range, while HA extracted at pH 8.4 showed preferential solubilization at neutral and alkaline pH. This was related to the dissociation characteristics of functional groups, their binding capacity with Bi, and precipitation of Bi carbonate or hydroxides. In addition to the dissociation characteristics of functional groups, the unique structural configuration of the HA could also contribute to Bi-HA complex formation. The solubility of Bi by naturally occurring DOM derived from the soil organic horizon (Oi) and its pH dependence were different from those associated with HA and varied among tree species.
ISSN:1093-4529
1532-4117
DOI:10.1080/10934521003651465