Journal
TALANTA
Volume 83, Issue 3, Pages 885-890Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2010.10.052
Keywords
Heavy metals; Dispersive liquid-liquid microextraction; Inductively coupled plasma-optical emission spectrometry; Sodium diethyldithiocarbamate; Experimental design
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In this study, dispersive liquid-liquid microextraction (DLLME) combined with inductively coupled plasma optical emission spectrometry (ICP-OES) was developed for simultaneous preconcentration and trace determination of chromium, copper, nickel and zinc in water samples. Sodium diethyldithiocarbamate (Na-DDTC), carbon tetrachloride and methanol were used as chelating agent, extraction solvent and disperser solvent, respectively. The effective parameters of DLLME such as volume of extraction and disperser solvents, pH, concentration of salt and concentration of the chelating agent were studied by a (2(f-1)) fractional factorial design to identify the most important parameters and their interactions. The results showed that concentration of salt and volume of disperser solvent had no effect on the extraction efficiency. In the next step, central composite design was used to obtain optimum levels of effective parameters. The optimal conditions were: volume of extraction solvent, 113 mu L; concentration of the chelating agent, 540 mg L-1; and pH, 6.70. The linear dynamic range for Cu, Ni and Zn was 1-1000 mu g L-1 and for Cr was 1-750 mu g L-1. The correlation coefficient (R-2) was higher than 0.993. The limits of detection were 0.23-0.55 mu g L-1. The relative standard deviations (RSDs. C = 200 mu g L-1, n = 7) were in the range of 2.1-3.8%. The method was successfully applied to determination of Cr, Cu, Ni and Zn in the real water samples and satisfactory relative recoveries (90-99%) were achieved. (C) 2010 Elsevier B.V. All rights reserved.
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