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Use of Chelating Resin YPA 4 Micro‐Columns for the On‐Line Preconcentration and Separation of Gold(III), Silver(I), Palladium(II) and Platinum(IV) in Geological and Environmental Samples and Their Determination by Inductively Coupled Plasma‐Atomic Emission Spectrometry
Author(s) -
Wu Yiwei,
Jiang Zucheng,
Hu Bin
Publication year - 2004
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.2004.tb00757.x
Subject(s) - palladium , chemistry , elution , thiourea , chelating resin , chelation , adsorption , platinum , nitric acid , trace amounts , nuclear chemistry , analytical chemistry (journal) , metal ions in aqueous solution , metal , chromatography , inorganic chemistry , catalysis , medicine , biochemistry , alternative medicine , organic chemistry , pathology
A simple and selective method of flow injection (FI) using a micro‐column packed with chelating resin YPA 4 as solid phase extractant was developed for the preconcentration and separation of trace amount of noble metals, Au(III), Ag(I), Pd(II) and Pt(IV), followed by ICP‐AES determination. In HNO 3 media, the chelating resin was selective towards Au(III), Ag(I), Pd(II) and Pt(IV), and the analysed ions were readily desorbed quantitatively with 5 ml of 2.5% m/v thiourea. Effects of acidity, sample flow rate and concentration, elution solution and interfering ions on the recovery of the analytes were systematically investigated. Under optimum conditions, the adsorption capacities of YPA 4 for Au(III), Ag(I), Pd(II) and Pt(IV) were 67.2, 43.1, 64.8 and 27.6 mg per gram of resin in HNO 3 media, respectively. It was found that YPA 4 could be used for more than eight runs in HNO 3 media without loss of capacity. The proposed method was used for the determination of trace noble metals in geological and environmental samples, and the analytical results obtained were in good agreement with the recommended values.