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Melted Paraffin Wax as an Innovative Liquid and Solid Extractant for Elemental Analysis by Laser-Induced Breakdown Spectroscopy

This work proposes a new development in the use of melted paraffin wax as a new extractant in a procedure designed to aggregate the advantages of liquid phase extraction (extract homogeneity, fast, and efficient transfer, low cost and simplicity) to solid phase extraction. As proof of concept, copper(II) in aqueous samples was converted into a hydrophobic complex of copper(II) diethyldithiocarbamate and subsequently extracted into paraffin wax. Parameters which affect the complexation and extraction (pH, DDTC, and Triton X-100 concentration, vortex agitation time and complexation time) were optimized in a univariate way. The combination of the extraction proposed procedure with laser-induced breakdown spectroscopy allowed the precise copper determination (coefficient of variation = 3.1%, n = 10) and enhanced detectability because of the concentration factor of 18 times. A calibration curve was obtained with a linear range of 0.50–10.00 mg L–1 (R2 = 0.9990, n = 7), LOD = 0.12 mg L–1, and LOQ = 0.38 mg L–1 ...

Authors:   Rodrigo Papai; Roseli Hiromi Sato; Lidiane Cristina Nunes; Francisco José Krug; Ivanise Gaubeur
Journal:   Analytical Chemistry
Year:   2017
DOI:   10.1021/acs.analchem.6b03766
Publication date:   16-Feb-2017
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