Chemical speciation of environmentally significant metals with inorganic ligands Part 2: The Cu2+-OH-, Cl-, CO32-, SO42-, and PO43- systems (IUPAC Technical Report)
Chemical speciation of environmentally significant metals with inorganic ligands Part 2: The Cu2+-OH-, Cl-, CO32-, SO42-, and PO43- systems (IUPAC Technical Report)
复制标题
DOI：
10.1351/pac200779050895
复制
发表时间：
2007-01
影响因子：
1.8
通讯作者：
K. Powell;P. Brown;R. Byrne;T. Gajda;G. Hefter;S. Sjöberg;H. Wanner
中科院分区：
文献类型：
--
作者：
K. Powell;P. Brown;R. Byrne;T. Gajda;G. Hefter;S. Sjöberg;H. Wanner
摘要在有机物浓度较低的天然水域中，CuII与常见的环境配体Cl-、OH-、CO32-、SO42-和PO43-形成络合物对CuII的形态形成有重要影响。铜(II)络合物是不稳定的，因此如果相关的稳定(生成)常数有可靠的值，则可以通过数值模拟来估计CuII在这些无机配体中的分布。本文对这些常数和相关的热力学数据进行了评述。它建议在Im=0molkg-1和25°C(298.15 K)时有效的log10βp，q，r°值，以及在较高离子强度下计算log10βp，q，r值所需的方程和比离子相互作用系数。还报告了反应热焓的一些值，ΔRHm值。在弱酸性淡水体系中，在没有有机配体的情况下，CuII的形态以Cu2+(AQ)为主，CuSO4(AQ)为辅。在海水中，以CuCO3(Aq)为主，其次为CuO3+、Cu2+(Aq)、CuCl2+、Cu(CO3)OH-、Cu(OH)2(Aq)和Cu(CO3)22-。在弱酸性盐水体系中，以Cu2+(AQ)和CuCl2+为主，CuSO4(AQ)和CuCl2(AQ)为次要物种。
Abstract Complex formation between CuII and the common environmental ligands Cl-, OH-, CO32-, SO42-, and PO43- can have a significant effect on CuII speciation in natural waters with low concentrations of organic matter. Copper(II) complexes are labile, so the CuII distribution amongst these inorganic ligands can be estimated by numerical modeling if reliable values for the relevant stability (formation) constants are available. This paper provides a critical review of such constants and related thermodynamic data. It recommends values of log10βp,q,r° valid at Im = 0 mol kg-1 and 25 °C (298.15 K), along with the equations and specific ion interaction coefficients required to calculate log10βp,q,r values at higher ionic strengths. Some values for reaction enthalpies, ΔrHm, are also reported where available. In weakly acidic fresh water systems, in the absence of organic ligands, CuII speciation is dominated by the species Cu2+(aq), with CuSO4(aq) as a minor species. In seawater, it is dominated by CuCO3(aq), with Cu(OH)+, Cu2+(aq), CuCl+, Cu(CO3)OH-, Cu(OH)2(aq), and Cu(CO3)22- as minor species. In weakly acidic saline systems, it is dominated by Cu2+(aq) and CuCl+, with CuSO4(aq) and CuCl2(aq) as minor species.