电感耦合等离子体原子发射光谱法测定汽车尾气催化剂中铂钯含量及其干扰研究  

Determination of Platinum and Palladium in Automobile Catalysts by Inductively Coupled Plasma-Atomic Emission Spectrometry and Effect of Interference

作　　者：倪露萍 徐鼎 张继东 孙明星 Ni Luping;Xu Ding;Zhang Jidong;Sun Mingxing(Industrial Products&Raw Materials Inspection&Testing Technology Center,Shanghai Customs District,Shanghai 200120,China)

机构地区：[1]上海海关工业品与原材料检测技术中心,上海200120

出　　处：《化学世界》2021年第5期305-309,共5页Chemical World

基　　金：海关总署科研(No.2019HK059)资助项目。

摘　　要：采用电感耦合等离子体原子发射光谱法(ICP-AES)测定经微波消解后的汽车尾气净化催化剂中的铂、钯含量。考察了样品前处理中溶样试剂的影响,确定最佳前处理条件。研究了催化剂中基体及稀土元素对铂、钯不同分析线的干扰情况,发现氟化氢的加入可使稀土元素转变为氟化稀土沉淀,从而降低其对被测元素的干扰。确定了铂和钯的最佳分析线分别为Pt 214.4 nm、Pd 324.2 nm。铂和钯样品的加标回收率分别为100.3%,98.8%。试验的相对标准偏差(RSD)为2.3%~4.4%。样品前处理中产生的再生沉淀中铂质量分数<0.7%。A method for the determination of the content of Pt and Pd in automobile catalysts after microwave digestion was established by inductively coupled plasma-atomic emission spectrometry(ICP-AES). Conditions of pretreatment were optimized, and the spectral interference of rare earth elements and matrix effect on the determination of Pt and Pd by ICP-AES was studied. The rare earth fluorides formed as sediments after the addition of hydrogen fluoride so that the interference effect was reduced. The analysis lines were Pt 214.4 and Pd 324.2 nm, respectively. The recovery rate of Pt and Pd was 100.3% and 98.8%, respectively. The relative standard deviation was from 2.3% to 4.4%. The content of Pt in sediments after pretreatment was less than 0.7%.

关 键 词：电感耦合等离子体原子发射光谱法 汽车催化剂 铂钯 稀土 

分 类 号：O657.3[理学—分析化学]