title: Carrier element-free coprecipitation with 3-phenly-4-o-hydroxybenzylidenamino-4,5-dihydro-1,2,4-triazole-5-one for separation/preconcentration of Cr(III), Fe(III), Pb(II) and Zn(II) from aqueous solutions.
abstract: A separation/preconcentration procedure, based on the coprecipitation of Cr(3+), Fe(3+), Pb(2+) and Zn(2+) ions using a new organic coprecipitant, 3-phenly-4-o-hydroxybenzylidenamino-4,5-dihydro-1,2,4-triazole-5-one (POHBAT) without adding any carrier element has been developed. The method, thus, has been called carrier element-free coprecipitation (CEFC). The resultant concentrated elements were determined by flame atomic absorption spectrometric determinations. The influences of some analytical parameters including pH of the solution, amount of the coprecipitant, standing time, centrifugation rate and time, sample volume and diverse ions were investigated on the quantitative recoveries of analyte ions. The validation of the present preconcentration procedure was performed by the analysis of two certified reference materials. The recoveries of understudy analytes were found in the range of 93-98%, while the detection limits were calculated in the range of 0.3-2.0 microg L(-1). The precision of the method evaluated as relative standard deviation (R.S.D.), was in the range of 3-7% depend on the analytes. The proposed method was successfully applied to environmental samples for the determination of the analytes.
authors.affiliation: Department of Chemistry, Faculty of Arts & Sciences, Karadeniz Technical University, Trabzon, Turkey.
authors.forename: Celal
authors.initials: C
authors.lastname: Duran
authors.forename: Volkan N
authors.initials: VN
authors.lastname: Bulut
authors.forename: Ali
authors.initials: A
authors.lastname: Gundogdu
authors.forename: Duygu
authors.initials: D
authors.lastname: Ozdes
authors.forename: Nuri
authors.initials: N
authors.lastname: Yildirim
authors.forename: Mustafa
authors.initials: M
authors.lastname: Soylak
authors.forename: H Basri
authors.initials: HB
authors.lastname: Senturk
authors.forename: Latif
authors.initials: L
authors.lastname: Elci
mesh_terms: D011232:Chemical Precipitation; D002857:Chromium / Q000302:isolation & purification; D004785:Environmental Pollutants / Q000302:isolation & purification; D007501:Iron / Q000302:isolation & purification; D007854:Lead / Q000302:isolation & purification; D012015:Reference Standards; D013054:Spectrophotometry, Atomic; D014230:Triazoles / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D015032:Zinc / Q000302:isolation & purification
chemical_list: D004785:Environmental Pollutants; D014230:Triazoles; D014874:Water Pollutants, Chemical; D002857:Chromium; C045575:1,2,4-triazole; D007854:Lead; D007501:Iron; D015032:Zinc