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首页> 外文期刊>Journal of Environmental Science and Health >Bismuth solubility through binding by various organic compounds and naturally occurring soil organic matter
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Bismuth solubility through binding by various organic compounds and naturally occurring soil organic matter

机译：通过各种有机化合物与天然存在的土壤有机物结合而产生的铋溶解度

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摘要

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.
机译：进行本研究以检查可溶有机物和pH值对Bi溶解度的影响，并推断使用EDTA，柠檬酸，酒石酸分散在土壤和水环境中的金属Bi的行为。 L-半胱氨酸，土壤腐殖酸（HA）和源自土壤有机层的可溶性有机物（DOM）。柠檬酸，酒石酸，L-半胱氨酸，HA和DOM对Bi的溶解度显示出pH依赖性，而EDTA则没有。 HA的Bi溶解度似乎与酸性官能团在分子中的pKa（酸解离常数）值的分布有关。即，在pH 3.2下提取的HA优先在酸性范围内溶解Bi，而在pH 8.4下提取的HA在中性和碱性pH下优先溶解。这与官能团的解离特性，它们与Bi的结合能力以及Bi碳酸盐或氢氧化物的沉淀有关。除了官能团的解离特性外，HA的独特结构构型也可能有助于Bi-HA复合物的形成。 Bi来自土壤有机层（Oi）的自然存在的DOM对Bi的溶解度及其对pH的依赖性不同于与HA相关的Bi，并且在树种之间也不同。

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