title: Silica chemically bonded N-propyl kriptofix 21 and 22 with immobilized palladium nanoparticles for solid phase extraction and preconcentration of some metal ions.
abstract: Silica gel chemically bonded N-propyl kriptofix 21 (SBNPK 21) and N-propyl kriptofix 22 (SBNPK 22) and subsequently immobilized with palladium nanoparticles (PNP-SBNPK 21 and PNP-SBNPK 22) to produce two new complexing lipophilic materials. Then these novel sorbents were applied for the enrichment of some metal ions and their subsequent determination by flame atomic absorption spectroscopy (FAAS). The influences of the variables including pH, amount of solid phase, sample flow rate, eluent conditions and sample volume on the metal ion recoveries were investigated. The detection limit of proposed method was in the interval 2.1-2.3 and 1.7-2.8 ng mL(-1) for PNP-SBNPK 21 and PNP-SBNPK 22 respectively, while the preconcentration factor was 80 for two sorbents. The relative standard deviations of recoveries were between 1.23-1.31 and 1.28-1.49 for PNP-SBNPK 21 and PNP-SBNPK 22 respectively. The method has high sorption-preconcentration efficiency even in the presence of various interfering ions. Due to the reasonable selectivity of proposed method, the relative standard deviation of recoveries of all understudied metal ions in some complicated matrices was less than 3.0%.
authors.affiliation: Chemistry Department, Yasouj University, Yasouj, 75914-353, Iran. m_ghaedi@mail.yu.ac.ir
authors.forename: Mehrorang
authors.initials: M
authors.lastname: Ghaedi
authors.forename: Khodabakhsh
authors.initials: K
authors.lastname: Niknam
authors.forename: Saeed
authors.initials: S
authors.lastname: Zamani
authors.forename: Habib Abasi
authors.initials: HA
authors.lastname: Larki
authors.forename: Mostafa
authors.initials: M
authors.lastname: Roosta
authors.forename: Mustafa
authors.initials: M
authors.lastname: Soylak
mesh_terms: D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D008670:Metals / Q000032:analysis* / Q000302:isolation & purification; D010165:Palladium / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D052616:Solid Phase Extraction; D013054:Spectrophotometry, Atomic
chemical_list: D007477:Ions; D008670:Metals; D010165:Palladium; D012822:Silicon Dioxide