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Determination of Platinum and Palladium in Geological Samples by Inductively Coupled Plasma‐Atomic Emission Spectrometry after Preconcentration with Immobilised Nanometric Titanium Dioxide
Author(s) -
Liang Pei,
Zhao Ehong,
Liu Rui
Publication year - 2009
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/j.1751-908x.2008.00900.x
Subject(s) - palladium , platinum , chemistry , inductively coupled plasma , detection limit , elution , inductively coupled plasma mass spectrometry , analytical chemistry (journal) , thiourea , titanium , silica gel , enrichment factor , mass spectrometry , chromatography , catalysis , plasma , biochemistry , physics , quantum mechanics , organic chemistry
A new method has been developed for the determination of platinum and palladium based on separation and preconcentration with a microcolumn packed with nanometric TiO 2 immobilised on silica gel (immobilised nanometric TiO 2 ) prior to their determination by inductively coupled plasma‐atomic emission spectrometry. The optimum experimental parameters for the preconcentration of Pt and Pd, such as the pH of the sample solution, its flow rate and volume, the type and concentration of eluent and interfering ions, have been investigated. Platinum and Pd could be quantitatively retained by immobilised nanometric TiO 2 in the pH range 6–8, then eluted completely with 2.0 ml of 3% m/v thiourea in 1.0 mol l −1 HNO 3 . The detection limits of this method for Pt and Pd were 12 and 7. 6 ng l −1 with an enrichment factor of 100, and the relative standard deviations were 4.7% and 3.3% at the 10 ng ml −1 level. The method has been applied for the determination of Pt and Pd in geological samples with satisfactory results.