期刊
JOURNAL OF ANALYTICAL CHEMISTRY
卷 67, 期 2, 页码 131-139出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S1061934812020141
关键词
Cloud point extraction; Cr species determination; Triton X-114; Brilliant Cresyl Blue; FAAS
A sensitive and selective method has been developed for the determination of chromium in water samples based on using cloud point extraction (CPE) preconcentration and determination by flame atomic absorption spectrometry (FAAS). The method is based on the complexation of Cr(III) ions with Brilliant Cresyl Blue (BCB) in the presence of non-ionic surfactant Triton X-114. Under the optimum conditions, the preconcentration of 50 mL of water sample in the presence of 0.5 g/L Triton X-114 and 1.2 x 10(-5) M BCB permitted the detection of 0.42 mu g/L chromium(III). The calibration graph was linear in the range of 1.5-70 mu g/L, and the recovery of more than 99% was achieved. The proposed method was used in FAAS determination of Cr(III) in water samples and certified water samples. In addition, the developed CPE-FAAS method was also used for speciation of the inorganic chromium species after reduction of Cr(VI) to Cr(III) using a thiosulphate solution of 120 mg/L in the presence of Hg(II) ion as a stabilizer.
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