期刊
TALANTA
卷 81, 期 1-2, 页码 176-179出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2009.11.054
关键词
Ultrasonic probe-assisted ionic liquid; dispersive liquid-liquid microextraction; Chromium(VI); ETAAS; Speciation
资金
- National Natural Science Foundation of China [20705009]
- Research Fund for New Teachers of Higher Education of China [20070504039]
- Youth Chenguang Project of Science and Technology of Wuhan of China [200750731280]
A novel method of ultrasonic probe-assisted ionic liquid dispersive liquid-liquid microextraction combined with electrothermal atomic absorption spectrometry (ETAAS) was developed for the determination of chromium(VI) species in water samples. In this procedure, the hydrophobic chelate of chromium(VI) with ammonium pyrrolidinedithiocarbamate (APDC) was extracted into the fine droplets of 1-hexyl-3-methylimidazolium hexafluorophosphate ([Hmim][PF6]), which was dispersed into the aqueous sample solution by ultrasonication using an ultrasonic probe. Several variables such as the volume of [Hmim][PF6], sample pH, concentration of APDC, and extraction time were investigated in detail. Under the optimum conditions, the limit of detection of the proposed method was 0.07 ng mL(-1) for Cr(VI) and the relative standard deviation for five-replicated determination of 2.0 ng mL(-1) Cr(VI) was 9.2%. The proposed method has been also successfully applied to the determination of chromium(VI) species in lake and tap water samples. (c) 2009 Elsevier B.V. All rights reserved.
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