Three-dimensional distribution analysis of platinum, palladium and rhodium in auto catalytic converters using imaging-mode laser-induced breakdown spectrometry

被引:52
作者
Lucena, P [1 ]
Laserna, JJ [1 ]
机构
[1] Univ Malaga, Fac Sci, Dept Analyt Chem, E-29071 Malaga, Spain
关键词
platinum; palladium; rhodium; auto catalytic converters; laser-induced breakdown spectrometry;
D O I
10.1016/S0584-8547(00)00298-6
中图分类号
O433 [光谱学];
学科分类号
0703 ; 070302 ;
摘要
Laser-induced breakdown spectrometry (LIBS) is reported here as an effective technique to describe the volume distribution of platinum, rhodium and palladium in catalytic converters installed in motor vehicles. Using the second harmonic output of a Nd:YAG laser and a CCD-based atomic emission spectrometer, LIES is used in multielemental, imaging-mode to permit the simultaneous analysis of the several elements present in the converter, including the internal standard. The data are reported with a lateral resolution of 1.75 mm over a fresh catalytic structure which is 128 mm long. The concentrational variability of the platinum group metals (PGMs) varies in the range similar to 3-23% relative standard deviation depending on the element, the substrate and the direction investigated. The causes of the dispersion observed are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:177 / 185
页数:9
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