Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 254, Issue -, Pages 134-140Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2013.03.025
Keywords
Ion pair based-surfactant assisted dispersive liquid-liquid microextraction (IP-SA-DLLME); Fiber optic-linear array detection spectrophotometry; Aqueous sample; Chromium speciation
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A simple ion pair based-surfactant assisted dispersive liquid-liquid microextraction (IP-SA-DLLME) was evaluated for extraction and preconcentration of Cr(VI) and Cr(III) in aqueous samples. In this method, which was used for the first time for chromium speciation analysis, sodium dodecyl sulfate (SDS) was used as both ion-pairing and disperser agent. Cr(VI) ions were converted into their cationic complex with 1,5-diphenylcarbazide (DPC) and then extracted into 1-octanol dispersed in aqueous solution. Cr(III) ion also can be determined by this procedure after oxidation to Cr(VI). After extraction and phase separation, upper organic phase was transferred to a micro cell of a fiber optic-linear array detection spectrophotometry (FO-LADS). The effects of various parameters on the extraction recovery were investigated. Under the optimized conditions and preconcentration of 10 mL of sample, the enrichment factor of 159 and the detection limit of 0.05 mu g L-1 were obtained. Validation of the method was performed by spiking-recovery method and comparison of results with those obtained by ET-AAS method. (C) 2013 Elsevier B.V. All rights reserved.
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