title: Simultaneous spectrophotometric determination of trace amounts of uranium, thorium, and zirconium using the partial least squares method after their preconcentration by alpha-benzoin oxime modified Amberlite XAD-2000 resin.
abstract: A new solid phase extraction method for separation and preconcentration of trace amounts of uranium, thorium, and zirconium in water samples is proposed. The procedure is based on the adsorption of U(VI), Th(IV) and Zr(IV) ions on a column of Amberlite XAD-2000 resin loaded with alpha-benzoin oxime prior to their simultaneous spectrophotometric determination with Arsenazo III using orthogonal signal correction partial least squares method. The enrichment factor for preconcentration of uranium, thorium, and zirconium was found to be 100. The detection limits for U(VI), Th(IV) and Zr(IV) were 0.50, 0.54, and 0.48microgL(-1), respectively. The precision of the method, evaluated as the relative standard deviation obtained by analyzing a series of 10 replicates, was below 4% for all elements. The practical applicability of the developed sorbent was examined using synthetic seawater, natural waters and ceramic samples.
authors.affiliation: Department of Chemistry, Faculty of Sciences, K.N. Toosi University of Technology, Tehran 16617, Iran. Jahan.ghasemi@gmail.com
authors.forename: Jahan B
authors.initials: JB
authors.lastname: Ghasemi
authors.forename: E
authors.initials: E
authors.lastname: Zolfonoun
mesh_terms: D000327:Adsorption; D053000:Analytic Sample Preparation Methods / Q000379:methods*; D001573:Benzoin / Q000031:analogs & derivatives* / Q000737:chemistry; D002138:Calibration; D002863:Chromogenic Compounds / Q000737:chemistry; D004785:Environmental Pollutants / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D016018:Least-Squares Analysis; D057230:Limit of Detection; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification*; D015999:Multivariate Analysis; D010091:Oximes / Q000737:chemistry*; D012117:Resins, Synthetic / Q000737:chemistry*; D012815:Signal Processing, Computer-Assisted; D052616:Solid Phase Extraction / Q000379:methods*; D013053:Spectrophotometry; D013910:Thorium / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D013997:Time Factors; D014501:Uranium / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D015040:Zirconium / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification
chemical_list: C547403:Amberlite XAD-2000; D002863:Chromogenic Compounds; D004785:Environmental Pollutants; D019216:Metals, Heavy; D010091:Oximes; D012117:Resins, Synthetic; C508928:alpha-benzoin oxime; D014501:Uranium; D013910:Thorium; D015040:Zirconium; D001573:Benzoin