火焰原子吸收光谱法测定尾气净化金属载体催化剂中铂钯铑  

Determination of platinum,palladium,rhodium in metal carrier catalyst for exhaust gas purification by flame atomic absorption spectrometry

作　　者：施意华[1,2] 王晟 杨仲平[1] 靳晓珠[1] 胡圣虹[2] 邓水平 

机构地区：[1]桂林矿产地质研究院测试中心,广西桂林541004 [2]中国地质大学生物地质与环境地质国家重点实验室,湖北武汉430074 [3]巴斯夫催化剂(桂林)有限公司,广西桂林541004

出　　处：《冶金分析》2012年第3期14-19,共6页Metallurgical Analysis

基　　金：国家自然科学基金(40973021);国家有色金属标准项目(2010-0477T-YS)资助

摘　　要：建立了火焰原子吸收光谱法测定尾气净化金属载体催化剂中Pt、Pd、Rh含量的新方法。研究了试样分解方法、共沉淀条件、测定干扰因素及消除方法。采用盐酸-超声波处理尾气净化金属载体催化剂,过滤,不溶物用过氧化钠分解,盐酸酸化后全部转化为样品溶液。在含2～3mol/L盐酸的样品溶液中,加入10mg氧化碲和10mL 200g/L氯化亚锡溶液共沉淀富集样品溶液中的Pt、Pd、Rh,与基体元素Fe、Ni、Al、Cr、Na等完全分离,共沉淀物用王水溶解后,采用火焰原子吸收光谱法测定Pt、Pd、Rh。方法的检出限分别为:Pt 4.72μg/g,Pd1.13μg/g,Rh 1.06μg/g。将本方法用于实际样品分析,结果与电感耦合等离子体原子发射光谱法测定值一致,相对标准偏差(RSD,n=11)分别为:3.0%(Pt),1.9%(Pd),4.2%(Rh)。A novel method for the determination of platinum, palladium and rhodium in metal carrier catalyst for exhaust gas purification was established by flame atomic absorption spectrometrometry （FAAS）. The sample decomposition method, coprecipitation condition interference factor and elimi nation method were studied. The metal carrier catalyst sample for exhaust gas purification was treated by hydrochloric acict-ultrasonic wave, and filtrated. The insoluble substance was decomposed with sodium peroxide and acidized with hydrochloric acid, and then it was mixed with sample solution. 10 mg of tellurium oxide and 10 mL of 200 g/L SnC12 solution were added to sample solution in the medium of 2-3 mol/L hydrochloric acid for the coprecipitation, enrichment and separation of palladium, plati：- num and rhodium from matrix elements such as Fe, Ni, Al, Cr and Na. After the coprecipitate was dissolved with aqua regia, the content of palladium, platinum and rhodium was determined by flame a- tomic absorption spectrometry. The detection limits of method for Pt, Pd and Rh are 4.72,1.13 and 1.06 ,respectively. The proposed method was applied to the determination of actual samples, and the results were consistent with those obtained by inductively coupled plasma atomic emission spectrome- try. The relative standard deviations （RSD, n=11） for palladium,：platinum and rhodium were 3.0%, 1.9 % and 4.2 %, respectively.

关 键 词：尾气净化金属载体催化剂 铂 钯 铑 火焰原子吸收光谱法 

分 类 号：O657.31[理学—分析化学]