论文部分内容阅读
本文通过试验发现,镉在高浓度的I~-离子存在下,可形成[CdI_4]~(2-)的络合阴离子。它在聚乙烯醇存在的磷酸溶液中,能与维多利亚蓝4R形成可溶性的离子缔合物。伴随着离子缔合物的形成,溶液由绿色变为蓝色。此显色反应具有很高的灵敏度,摩尔吸光系数可达1.35×10~5,并且有较好的选择性,大量的铁、铝、锌等不干扰,因此可不经分离而直接在水相中测定纯锌中微量镉。方法简便,有较好的准确度和重复性。
In this paper, we found that cadmium can form complex anion of [CdI_4] ~ (2-) in the presence of high concentration of I ~ - ions. It is in polyvinyl alcohol in the presence of phosphoric acid solution, with Victoria Blue 4R to form soluble ion association. The solution changes from green to blue with the formation of ion-association. The color reaction has high sensitivity, molar absorption coefficient of up to 1.35 × 10 ~ 5, and has good selectivity, a lot of iron, aluminum, zinc and other non-interference, it can be separated directly in the aqueous phase Determination of trace zinc in pure cadmium. The method is simple, with good accuracy and repeatability.