催化剂中微量铂的流动注射微分光度法测定  

Determination of micro platinum in catalyst by flow injection and differential spectrophotometric methed

作　　者：赵珍义[1] 韩光喜[1] 徐锐[1] 李学丽[1] 

机构地区：[1]辽宁大学化学院,辽宁沈阳110036

出　　处：《冶金分析》2008年第2期52-54,共3页Metallurgical Analysis

摘　　要：将自行研制的一组流通比色装置安装到检测器的样品光束和参比光束的光路中以实现流动注射微分光度法测定微量铂。在强碱性介质中,显色剂5-（4-硝基苯偶氮）-8-（4-甲苯磺酰氨基）喹啉（NPTSQ）与Pt^2＋形成2∶1紫蓝色络合物,Pt^2＋含量在0～1.3μg/mL范围内遵守比耳定律。进样频率为190次/h,灵敏度较普通光度法提高1.8倍。对0.35μg/mL的Pt^2＋连续13次测定,相对标准偏差为1.0%。除Pd^2＋之外,大部分贵金属离子对测定没有干扰,但Pd^2＋的干扰可用KI和抗坏血酸消除。本法应用于催化剂中微量铂的分析,结果满意。A group of self-made flow color-comparison apparatus are fixed to the beam path of sample beam and reference beam of the detector to achieve the determination of platinum by flow injection differential spectrophtometry. 5- （4-mitrophenylazo）-8-（4-toluenesulfulfonamido） quinoline （NPTSQ） reacts with Pt（Ⅱ） to form a blue complex with a radio of 2 ： 1. When sampling frequency is 190 times per hour,the sensitivity of the method is 2.8 times that of the common spectrophotometric method. The Beer＇s law is obeyed in the range of 0 to 1.3 μg/mL for Pt（Ⅱ） . For 13 continual determination of 0.35μg/mL Pt（Ⅱ）, the relative standard deviation is 1.0%. The majority of precious metals ions do not interfere in determination except Pd^2＋. Interference from Pd^2＋ may be eliminated with KI and ascorbic acid. It is applied to the analysis of platium in the catalyst with satisfactory results.

关 键 词：流动注射分析 微分光度法 铂 双光束检测器 

分 类 号：O643.36[理学—物理化学] O657.3[理学—化学]