摘要
本文提出了一种新的光度测定论的方法。该方法基于在聚乙烯醇（ＰＶＡ）存在下，钯与钼酸盐和丁基罗丹明Ｂ（ＢＲＢ）反应形成离子缔合物。缔合物的最大吸收位于５８０ｎｍ，摩尔吸光系数ε为３．１４×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），钯量在０～４ｕｇ／２５ｍｌ范围内服从比尔定律。缔合物中ｐｄ：ＢＲＢ＝１：４，体系至少可稳定１０ｈ，测定钯的适宜条件是：Ｃ＿（ＨＣＯ４）＝１．６ｍｏｌ／Ｌ，Ｃ＿（ＢＲＢ）＝３．８×１０￣（－５）ｍｏｌ／Ｌ，ＰＶＡ０．０８％。考察了３０多种共存离子的影响。本法用于碳基和铝基催化剂中钯的测定，结果满意。
A new sensitive colour system of palladium－molybdate－butyl rhodamine B （BRB）－polyvinyl alcohol（PVA）hasbeen studied. The optimum conditions for the determination of palladium are estimated as [HCLO_4]＝1.6mol／L[BRB~＋]＝3.8×10^(-5)mol／L,The molar absorptivity at 580nm is 3.14 × 10~5L·mol^(-1)·cm^(-1)Beer’s law is obeyedover the range 0－4ug of palladium per 25ml. of palladium per 25ml. The molar ratio of Pd to BRB in the ion associate is established to be 1 ：4.The colour system of the agueous solution was stable for at least 10h. The influence of over 30 diverse ions was examined. Themethod can be applied to the spectrophotometric determination of microamounts of palladium in some catalysts wsth satisfactory results.
出处
《冶金分析》
CAS
CSCD
北大核心
1995年第4期4-7,共4页
Metallurgical Analysis
基金
云南省科学基金
关键词
钯
钼酸铵
丁基罗丹明B
光度法
显色反应
Palladium, Molybdate, Butyl rhodamine B , Spectrophotometry
