title: Automated on-line preconcentration of palladium on different sorbents and its determination in environmental samples.
abstract: The determination of noble metals in environmental samples is of increasing importance. Palladium is often employed as a catalyst in chemical industry and is also used with platinum and rhodium in motor car catalytic converters which might cause environmental pollution problems. Two different sorbents for palladium preconcentration in different samples were investigated: silica gel functionalized with 1,5-bis(di-2-pyridyl)methylene tbiocarbohydrazide (DPTH-gel) and [1,5-Bis(2-pyridyl)-3-sulphophenyI methylene thiocarbonohydrazide (PSTH) immobilised on an anion-exchange resin (Dowex lx8-200)]. The sorbents were tested in a micro-column, placed in the auto-sampler arm, at the flow rate 2.8 mL min(-1). Elution was performed with 4 M HCl and 4 M HNO3, respectively. Satisfactory results were obtained for two sorbents.
authors.affiliation: Department of Analytical Chemistry, Faculty of Sciences, University of Málaga, 29071 Málaga, Spain. fsanchezr@uma.es
authors.forename: Fuensanta
authors.initials: F
authors.lastname: Sánchez Rojas
authors.forename: Catalina
authors.initials: C
authors.lastname: Bosch Ojeda
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Cano Pavón
mesh_terms: D000327:Adsorption; D001331:Automation; D004785:Environmental Pollutants / Q000032:analysis*; D007220:Industrial Waste / Q000032:analysis; D007475:Ion Exchange Resins; D010165:Palladium / Q000032:analysis*; D058428:Silica Gel; D012822:Silicon Dioxide