title: Optimization of Emulsification-based Liquid Phase Microextraction of Chromium in Seawater of Chabahar Bay for its Speciation by High-Performance Liquid Chromatography.
abstract: After complexation of Cr(III) and Cr(VI) species with diethyldithiocarbamate (0.2 mmol/L), effective parameters of emulsification-based dispersive liquid microextraction procedure was optimized for its preconcentration in artificial seawater. Triton X-305 as the emulsifying disperser and mixture of the chloroform and carbon tetrachloride as the extraction solvents show a better behavior at sample pH of 6.5. The method was applied for extraction and UV detection (λ = 254 nm) of chromium species of the Chabahar Bay seawater prior to high-performance liquid chromatography (conditions: C18, methanol: acetic acid solution 2% v (85:15), flow rate of 0.8 mL min-1). Characteristics of the method such as enrichment factor (210 and 228), linear range (10-300 µg L-1), limit of detection (0.017 and 0.597 µg L-1) and repeatability, (N = 5, concentration of 100 µg L-1%relative standard deviation = 2.6% and 0.45%) were evaluated for Cr(III) and Cr(VI), respectively.
authors.affiliation: Department of Marine Chemistry, Faculty of Marine Sciences, Chabahar Maritime University, Chabahar, Sistan va Baluchestan, P.O. 99717-56499, Iran (Islamic Republic) idm.m.zahedi@gmail.com.
authors.forename: Mir Mahdi
authors.initials: MM
authors.lastname: Zahedi
authors.affiliation: Department of Marine Chemistry, Faculty of Marine Sciences, Chabahar Maritime University, Chabahar, Sistan va Baluchestan, P.O. 99717-56499, Iran (Islamic Republic).
authors.forename: Ahmad
authors.initials: A
authors.lastname: Rezaei
mesh_terms: D061006:Bays / Q000737:chemistry; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002851:Chromatography, High Pressure Liquid; D002857:Chromium / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D059627:Liquid Phase Microextraction; D012623:Seawater / Q000737:chemistry*; D012997:Solvents
chemical_list: D012997:Solvents; D002857:Chromium