DISTRIBUTION MODEL FOR BINDING OF PROTONS AND METAL-IONS BY HUMIC SUBSTANCES
DISTRIBUTION MODEL FOR BINDING OF PROTONS AND METAL-IONS BY HUMIC SUBSTANCES
复制标题
DOI：
10.1021/es00117a006
复制
发表时间：
1983-01-01
影响因子：
11.4
通讯作者：
LYTLE, CR
中科院分区：
文献类型：
--
作者：
PERDUE, EM;LYTLE, CR
提出了腐殖物质与质子和金属离子结合的数学模型。完全经验性质的简单，discrete模型，处理腐殖物质的混合物的两个或三个配体（通常被错误地称为“类”的配体）被清楚地证明。腐殖物质中配位体混合物的极端复杂性表明，连续配位体分布模型将是更合适的，即，一个模型，其中可以处理质子或金属结合的连续log K值。在所提出的模型中，它是假设配体浓度是正态分布相对于他们的log K值。然后，配体的“类”可以通过其平均log K值（μ）和log K值关于平均值的标准偏差（α）来表征。该模型已成功地应用于络合铜（II）的水生腐殖质和污水污泥衍生的富里酸。质子结合水生腐殖质有效地描述了一个类似的模型，其中包含两类功能基团。
A mathematical model is proposed for the binding of protons and metal ions by humic substances. The totally empirical nature of simple, discretemodels that treat humic substances as a mixture of two or three ligands (often erroneously referred to as “classes” of ligands) is clearly demonstrated. The extreme complexity of the mixture of ligands in humic substances suggests that a continuous ligand distribution model would be more ap-propriate, ie, a model in which a continuum of log K values for proton or metal binding could be treated. In the proposed model, it is assumed that ligand concentra-tions are normally distributed with respect to their log K values. A “class” of ligands can then be characterized by its mean log K value (µ) and the standard deviation (a) of log K values about the mean. This model has been successfully applied to the complexation of copper (II) by aquatic humus and by sewage sludge derived fulvic acids. Proton binding by aquatic humus is efficiently described by a similar model that contains two classes of functional groups.