title: [Determination of chromium(III) and chromium(VI) in water using flow injection on-line preconcentration and separation with flame absorption spectrometric detection].
abstract: A rapid and sensitive method for the sequential determination of Cr(III) and Cr(VI) in water samples based on flow injection on-line preconcentration and separation with two-microcolumn system-flame atomic absorption spectrometry has been developed. The Cr(III) and Cr(VI) in water samples were respectively retained in a microcolum with cation exchange resin and in a microcolumn with anion exchange resin and were eluted directly by 15% HNO3 and 8% NH4NO3, respectively. The characteristic concentrations (pre-concentration time of 1 min) for Cr(III) and Cr(VI) were 1.50 micrograms.L-1 and 1.39 micrograms.L-1, respectively, The relative standard deviations at 10 micrograms.L-1 level were 3.41% and 1.80%, and the corresponding detection limits (3 sigma) were 1.03 micrograms.L-1 and 0.54 microgram.L-1, respectively. The satisfactory recovery of 93.48%-107.5% could be obtained from water samples.
authors.affiliation: College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China.
authors.forename: Wei-jun
authors.initials: WJ
authors.lastname: Kang
authors.forename: Shu-xuan
authors.initials: SX
authors.lastname: Liang
authors.forename: Jing
authors.initials: J
authors.lastname: Ha
authors.forename: Shi-gang
authors.initials: SG
authors.lastname: Shen
authors.forename: Han-wen
authors.initials: HW
authors.lastname: Sun
mesh_terms: D002857:Chromium / Q000032:analysis* / Q000737:chemistry*; D017608:Chromium Compounds / Q000032:analysis / Q000737:chemistry; D017022:Flow Injection Analysis / Q000379:methods; D012680:Sensitivity and Specificity; D013054:Spectrophotometry, Atomic / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*
chemical_list: D017608:Chromium Compounds; D014874:Water Pollutants, Chemical; D002857:Chromium