Journal
TALANTA
Volume 131, Issue -, Pages 348-353Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2014.07.090
Keywords
Dispersive liquid-liquid microextraction; LIBS analysis; Liquid samples; Trace metals determination
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Funding
- Spanish Government [CTQ2011-23968]
- Regional Government of Valencia (Spain) [ACOMP/2013/072]
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A rapid and efficient Dispersive Liquid-Liquid Microextraction (DLLME) followed by Laser-Induced Breakdown Spectroscopy detection (LIBS) was evaluated for simultaneous determination of Cr, Cu, Mn, Ni and Zn in water samples. Metals in the samples were extracted with tetrachloromethane as pyrrolidinedithiocarbamate (APDC) complexes, using vortex agitation to achieve dispersion of the extractant solvent. Several DLLME experimental factors affecting extraction efficiency were optimized with a multivariate approach. Under optimum DLLME conditions, DLLME-LIBS method was found to be of about 4.0-5.5 times more sensitive than LIBS, achieving limits of detection of about 3.7-5.6 times lower. To assess accuracy of the proposed DLLME-LIBS procedure, a certified reference material of estuarine water was analyzed. (C) 2014 Elsevier B.V. All rights reserved.
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