Improved resolution in stripping analysis using the formation of intermetallic compounds.
Improved resolution in stripping analysis using the formation of intermetallic compounds.
复制标题
利用金属间化合物的形成提高剥离分析的分辨率。
DOI：
10.1021/ac00277a027
复制
发表时间：
1984
影响因子：
7.4
通讯作者：
Luo,DB
中科院分区：
文献类型：
--
作者：
Wang,J;Farias,PA;Luo,DB
A new approach for Improving the selectivity In stripping analysis, based on the preferential formation of an Intermetallic compound, Is described. For this purpose, a third element Is added to the sample solution to mask, In the mercury electrode, one ofthe metals In a mixture. Conditions that favor the formation of Intermetallic compounds, le, high amalgam concentration, are explored and used. The method Is evaluated tor a number of different mixtures, with different degrees of peak overlap. For example, the addition of copper allows the selective measurement of lead or thallium In the presence of Indium or cadmium. Different concentration ratios of the mixture components can be tolerated depending upon the peak potential separation, from 90-fold excess of the In-terfering metal for AEP of140 mV to a 1: 1 ratio for AEP of 15 mV. The procedure Is simple and rapid. In addition, the data provide new Insights Into the formation of Intermetallic compounds.Stripping analysis is a particularly useful technique for measuring heavy metals in environmental, clinical, and industrial samples. A principal difficulty in its analytical utility is the problem of resolution of overlapping peaks. Within a relatively narrow potential window of about 1.5 V more than 15 metals may yield stripping (oxidation) peaks. Thus it is difficult to resolve metals which have stripping peak potentials in close proximity to one another. The resolution between two adjacent peaks depends on the peak potentials, peak widths, and concentrations.
