title: Separation and preconcentration of Pb(II) using ionic liquid-modified silica and its determination by flame atomic absorption spectrometry.
abstract: A new method based on microcolumn packed with ionic liquid-modified silica combined with flame atomic absorption spectrometry has been developed for the determination of lead in environmental samples. Several factors influencing the preconcentration efficiency of lead and its subsequent determination, such as pH of the sample, flow rate, mass of ionic liquid, and interfering effect, have been investigated. Lead could be quantitatively retained by ionic liquid-modified silica in the pH range of 5-7, and then eluted completely with 3.0 mL 1.0 mol L(-1) HCl. The detection limit of this method for lead was 0.7 μg L(-1) with preconcentration factor of 185, and the relative standard deviation (RSD) was 4.2% at 0.1 μg mL(-1) Pb(II). This method has been applied for the determination of trace amount of lead in NIST standard reference material 2709 (San Joaquin Soil) and river water samples with satisfactory results.
authors.affiliation: Dokuz Eylul University, Faculty of Sciences and Arts, Chemistry Department, Kaynaklar Campus, 35160 Izmir, Turkey.
authors.forename: Sevda
authors.initials: S
authors.lastname: Ayata
authors.forename: Serap Seyhan
authors.initials: SS
authors.lastname: Bozkurt
authors.forename: Kasim
authors.initials: K
authors.lastname: Ocakoglu
mesh_terms: D053000:Analytic Sample Preparation Methods / Q000379:methods*; D005591:Chemical Fractionation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D052578:Ionic Liquids / Q000737:chemistry*; D007854:Lead / Q000032:analysis* / Q000302:isolation & purification*; D057230:Limit of Detection; D012822:Silicon Dioxide / Q000737:chemistry*; D012987:Soil / Q000737:chemistry; D013054:Spectrophotometry, Atomic / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared; D014867:Water / Q000737:chemistry
chemical_list: D052578:Ionic Liquids; D012987:Soil; D014867:Water; D007854:Lead; D012822:Silicon Dioxide