title: Sensitive spectrophotometric determination of Co(II) using dispersive liquid-liquid micro-extraction method in soil samples.
abstract: Analytical performance of conventional spectrophotometer was developed by coupling of effective dispersive liquid-liquid micro-extraction method with spectrophotometric determination for ultra-trace determination of cobalt. The method was based on the formation of Co(II)-alpha-benzoin oxime complex and its extraction using a dispersive liquid-liquid micro-extraction technique. During the present work, several important variables such as pH, ligand concentration, amount and type of dispersive, and extracting solvent were optimized. It was found that the crucial factor for the Co(II)-alpha benzoin oxime complex formation is the pH of the alkaline alcoholic medium. Under the optimized condition, the calibration graph was linear in the ranges of 1.0-110 μg L(-1) with the detection limit (S/N = 3) of 0.5 μg L(-1). The preconcentration operation of 25 mL of sample gave enhancement factor of 75. The proposed method was applied for determination of Co(II) in soil samples.
authors.affiliation: Chemistry Department, Payame Noor University, 19395-4697, Tehran, Iran. F.Hasanpour@pnu.ac.ir.
authors.forename: Foroozan
authors.initials: F
authors.lastname: Hasanpour
authors.affiliation: Department of Chemistry, Isfahan University of Technology, Isfahan, 84156-83111, Iran.
authors.forename: Hassan
authors.initials: H
authors.lastname: Hadadzadeh
authors.affiliation: Chemistry Department, Payame Noor University, 19395-4697, Tehran, Iran.
authors.forename: Masoumeh
authors.initials: M
authors.lastname: Taei
authors.affiliation: Chemistry Department, Payame Noor University, 19395-4697, Tehran, Iran.
authors.forename: Mohsen
authors.initials: M
authors.lastname: Nekouei
authors.affiliation: Chemistry Department, Payame Noor University, 19395-4697, Tehran, Iran.
authors.forename: Elmira
authors.initials: E
authors.lastname: Mozafari
mesh_terms: D001573:Benzoin / Q000031:analogs & derivatives; D002138:Calibration; D003035:Cobalt / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D059627:Liquid Phase Microextraction; D010091:Oximes; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D012997:Solvents; D013053:Spectrophotometry
chemical_list: D010091:Oximes; D012987:Soil; D012989:Soil Pollutants; D012997:Solvents; C508928:alpha-benzoin oxime; D003035:Cobalt; D001573:Benzoin
keywords: Alpha-benzoin oxime; Cobalt(II); Dispersive liquid-liquid micro-extraction; Spectrophotometric determination