期刊
PURE AND APPLIED CHEMISTRY
卷 73, 期 1, 页码 9-15出版社
INT UNION PURE APPLIED CHEMISTRY
DOI: 10.1351/pac200173010009
关键词
-
The possibilities of using diffusive gradients in thin films (DGT) and anodic strip ping voltammetry (ASV) to perform speciation measurements in natural waters are discussed. Both techniques measure labile species, but different approaches have been used to discriminate organic (C-org) and inorganic (C-inorg) metal complexes. In DGT, metals are bound to a resin after passing through a hydrogel that serves as a well-defined diffusion layer. DGT devices with different hydrogels that impede the diffusion of humic substances by different amounts were deployed in solutions of copper and humic substances. Devices with a gel composition that greatly restricted the diffusion of humic substances, but only retarded the diffusion of Cu ions slightly, could be used directly to determine Ci,,. By using different, more open pored gels, which allowed some passage of humic substances, it was possible to determine both C-org and C-inorg. The two separate measurements of C-inorg obtained using the two DGT approaches agreed well. At the high concentrations of Cu used there was good agreement with the predicted distribution from the speciation code WHAM. At the lowest Cu concentration, the proportion of C-inorg estimated using DGT was higher than with WHAM. Possibilities of errors in the DGT or modeling approaches are discussed.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据