title: Cloud point extraction, preconcentration and simultaneous spectrophotometric determination of nickel and cobalt in water samples.
abstract: Cloud point extraction has been used for the preconcentration and simultaneous spectrophotometric determination of nickel and cobalt after the formation of a complex with 2-amino-cyclopentene-1-dithiocarboxylic acid (ACDA), and latter analysis by spectrophotometer using Triton X-114 as surfactant. The parameters affecting the separation phase and detection process were optimized. Under the optimum experimental conditions (i.e. pH=5, 0.07 mM ACDA, Triton X-114=0.25% (w/v)), calibration graphs were linear in the range of 20-500 and 20-200 microg l(-1) with detection limits of 10 and 7.5 microg l(-1) for Ni and Co, respectively. The method was applied to the determination of Ni and Co in natural and waste water samples with satisfactory results.
authors.affiliation: Department of Chemistry, College of Sciences, Shiraz University, Shiraz 71454, Iran. safavi@chem.susc.ac.ir
authors.forename: A
authors.initials: A
authors.lastname: Safavi
authors.forename: H
authors.initials: H
authors.lastname: Abdollahi
authors.forename: M R
authors.initials: MR
authors.lastname: Hormozi Nezhad
authors.forename: R
authors.initials: R
authors.lastname: Kamali
mesh_terms: D002264:Carboxylic Acids; D003035:Cobalt / Q000032:analysis* / Q000302:isolation & purification; D003517:Cyclopentanes; D004573:Electrolytes; D005618:Fresh Water / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D009532:Nickel / Q000032:analysis* / Q000302:isolation & purification; D017830:Octoxynol; D011092:Polyethylene Glycols; D012623:Seawater / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods*; D013501:Surface-Active Agents; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis; D014881:Water Supply / Q000032:analysis
chemical_list: C107952:2-aminocyclopentene-1-dithiocarboxylic acid; D002264:Carboxylic Acids; D003517:Cyclopentanes; D004573:Electrolytes; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D014867:Water; D003035:Cobalt; D011092:Polyethylene Glycols; D009532:Nickel; D017830:Octoxynol; C010615:Nonidet P-40