二溴羟基卟啉光度法测定微量铂  

Determination of trace platinum by spectrophotometry with meso-tetra-(3,5-dibromo-4-hydroxyphenyl)porphyrin

作　　者：陈文宾[1] 马卫兴[1] 徐国想[1] 许兴友[1] 张秋荣[1] 

机构地区：[1]淮海工学院化学工程系

出　　处：《冶金分析》2007年第6期73-75,共3页Metallurgical Analysis

基　　金：江苏省海洋生物技术重点建设实验室基金项目(2005HS001010;2006HS020);淮海工学院自然科学基金项目(Z2005014)

摘　　要：研究了在TritonX-100存在下,Pt(Ⅱ)与二溴羟基卟啉的显色反应。结果表明,在pH 9.4的Na_2SO_3溶液中,Pt(Ⅱ)与二溴羟基卟啉及Na_2SO_3形成1:1:2的络合物,络合物的最大吸收峰位于386nm波长处,表观摩尔吸光系数为3.76×10~5L·mol^(-1)·cm^(-1)。10 mL溶液中,Pt(Ⅱ)含量在0～4.0μg范围内符合比尔定律。本法用于催化剂和贵金属矿物中微量铂的测定,RSD为1.26%～3.76%,回收率为97.6%～98.2%。The color reaction of the meso-tetra-（3,5-dibromo-4-hydroxyphenyl）porphyrin with Pt（Ⅱ） in the presence of TritonX-100 were studied. Results show that the reagent reacts with Pt（Ⅱ） and Na2SO3 to form a stable complex（1 ： 1 ： 2） in the presence of Na2SO3 buffer at pH 9.4. The maxium absorption wavelength and apparent molar absorptivity are 386 nm and 3.76×10^5L·mol^-1·cm^-1, respectively. Beer＇s law is obeyed in the range of 0-4. 0 μg/10 mL for Pt（Ⅱ）. The method has been applied to the determination of trace platinum in catalyst and platinum concentrate with RSD of 1.26 %-3.76 % and recovery of 97.6 %- 98.2 % .

关 键 词：二溴羟基卟啉 分光光度法 铂 

分 类 号：O657.3[理学—分析化学]