title: Speciation determination of chromium(III) and (VI) using preconcentration cloud point extraction with flame atomic absorption spectrometry (FAAS).
abstract: bis-[2-Hydroxy-1-naphthaldehyde] thiourea was synthesized and preconcentration cloud point extraction (CPE) for speciation determination of chromium(III) and (VI) in various environmental samples with flame atomic absorption spectrometry (FAAS) has been developed. Chromium(III) complexes with bis-[2-hydroxynaphthaldehyde] thiourea is subsequently entrapped in the surfactant micelles. After complexation of chromium(III) with reagent, the analyte was quantitatively extracted to the surfactant-rich phase in the non-ionic surfactant Triton X-100 after centrifugation. The effect of pH, concentration of chelating agent, surfactant, equilibration temperature and time on CPE was studied. The relative standard deviation was 2.13% and the limits of detection were around 0.18 microg L(-1).
authors.affiliation: Department of Environmental Sciences, S.V. University, Tirupati, 517502 A.P., India.
authors.forename: K
authors.initials: K
authors.lastname: Kiran
authors.forename: K Suresh
authors.initials: KS
authors.lastname: Kumar
authors.forename: B
authors.initials: B
authors.lastname: Prasad
authors.forename: K
authors.initials: K
authors.lastname: Suvardhan
authors.forename: Ramesh Babu
authors.initials: RB
authors.lastname: Lekkala
authors.forename: K
authors.initials: K
authors.lastname: Janardhanam
mesh_terms: D002857:Chromium / Q000032:analysis* / Q000737:chemistry; D004784:Environmental Monitoring; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste; D009281:Naphthalenes / Q000737:chemistry; D017830:Octoxynol / Q000737:chemistry; D045483:Rivers / Q000737:chemistry; D013054:Spectrophotometry, Atomic / Q000379:methods; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature; D013890:Thiourea / Q000737:chemistry; D014783:Viscosity; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D014881:Water Supply / Q000032:analysis
chemical_list: D007220:Industrial Waste; D009281:Naphthalenes; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; C062247:2-hydroxy-1-naphthaldehyde; D017830:Octoxynol; D013890:Thiourea