title: A novel vortex-assisted liquid-liquid microextraction approach using auxiliary solvent: Determination of iodide in mineral water samples.
abstract: A novel vortex-assisted liquid-liquid microextraction (VA-LLME) for determination of iodide was developed. The method includes the oxidation of iodide with iodate in the presence of hydrochloric acid followed by VA-LLME of the ion-pair formed between ICl2(-) and Astra Phloxine reagent (AP) and subsequent absorbance measurement at 555nm. The appropriate experimental conditions were investigated and found to be: 5mL of sample, 0.27molL(-)(1) HCl, 0.027mmolL(-1) KIO3 as the oxidation agent, 250μL of extraction mixture containing amyl acetate as the extraction solvent and carbon tetrachloride as the auxiliary solvent (1:1, v/v), 0.04mmolL(-1) AP reagent, vortex time: 20s at 3000rpm, centrifugation: 4min at 3000rpm. The calibration plot was linear in the range 16.9-169μg L(-1) of iodide, with a correlation coefficient (R(2)) of 0.996, and the relative standard deviation ranged from 1.9 to 5.7%. The limit of detection (LOD) and limit of quantification (LOQ) were 1.75 and 6.01μgL(-)(1) of iodide, respectively. The suggested procedure was applied for determination of iodide in real mineral water samples.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Oles Honchar Dnipropetrovsk National University, UA-49010, Dnipropetrovsk, Ukraine.
authors.forename: Serhii
authors.initials: S
authors.lastname: Zaruba
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Oles Honchar Dnipropetrovsk National University, UA-49010, Dnipropetrovsk, Ukraine.
authors.forename: Andriy B
authors.initials: AB
authors.lastname: Vishnikin
authors.affiliation: Department of Analytical Chemistry, Faculty of Science, P.J. Šafárik University, SK-01454 Košice, Slovak Republic.
authors.forename: Vasil
authors.initials: V
authors.lastname: Andruch
mesh_terms: D006851:Hydrochloric Acid / Q000737:chemistry; D007452:Iodates / Q000737:chemistry; D007454:Iodides / Q000032:analysis* / Q000737:chemistry; D057230:Limit of Detection; D059627:Liquid Phase Microextraction / Q000379:methods; D008900:Mineral Waters / Q000032:analysis*; D010084:Oxidation-Reduction; D017680:Potassium Compounds / Q000737:chemistry; D012997:Solvents / Q000737:chemistry
chemical_list: D007452:Iodates; D007454:Iodides; D008900:Mineral Waters; D017680:Potassium Compounds; D012997:Solvents; C039693:potassium iodate; D006851:Hydrochloric Acid
keywords: Auxiliary solvent; Iodide; Mineral water; Vortex-assisted liquid–liquid microextraction (VA–LLME)