Interactions of W(VI) and Mo(VI) Oxyanions with Metal Cations in Natural Waters

被引：17
|
作者：
Torres, Julia [1 ]
Tissot, Florencia [2 ]
Santos, Patricia [1 ]
Ferrari, Carolina [1 ]
Kremer, Carlos [1 ]
Kremer, Eduardo [1 ]
机构：
[1] Univ Republica, Fac Quim, Dept Estrella Campos, Catedra Quim Inorgan, CC 1157, Montevideo, Uruguay
[2] Univ Republica, Fac Quim, Dept Estrella Campos, Catedra Quim Analit, CC 1157, Montevideo, Uruguay
来源：
JOURNAL OF SOLUTION CHEMISTRY | 2016年 / 45卷 / 11期
关键词：
Tungstate; Molybdate; Chemical speciation; Metal cations; Potentiometry; DIFFERENT IONIC STRENGTHS; TUNGSTEN CONCENTRATIONS; ACTIVATED CARBON; AQUEOUS-SOLUTION; SPECIATION; EQUILIBRIA; MOLYBDENUM; ADSORPTION; SYSTEMS; SPECTROSCOPY;
D O I：
10.1007/s10953-016-0522-6
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The association of tungsten(VI) and molybdenum(VI) oxyanions with metal cations was investigated under conditions simulating those prevailing in most natural waters. Potentiometric titrations were carried out for the systems containing tungsten(VI) or molybdenum(VI) anions and metal cations. The selection includes the major metal cations and some other ions of high environmental relevance. At neutral and basic pH values, in the presence of the most abundant metal cations, ionic pair species such as [Ca(WO4)] or [Ca(MoO4)] are formed to high extents. For the acidic pH range, polyoxoanion associations with cations are also found but are only relevant for tungsten(VI) in the conditions of the natural aquatic systems. The present results provide the basis for studying W(VI) and Mo(VI) speciation in natural aquatic systems, on which the environmental fate, bioavailability and toxicity of the elements depend.
引用
收藏
页码：1598 / 1611
页数：14
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