Journal
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Volume 25, Issue 9, Pages 1485-1490Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c000040j
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- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Agencia Nacional de Promocion Cientifica y Tecnologica (FONCYT)
- Universidad Nacional de Cuyo (Argentina)
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A simple and highly efficient microextraction methodology was developed for arsenate [As(V)], arsenite [As(III)] and organic arsenic (i.e., DMA and MMA) preconcentration and determination based on the novel use of tetradecyl(trihexyl) phosphonium chloride ionic liquid (CYPHOS(R) IL 101) as an ion-pairing reagent. As(V) species was selectively separated by forming As(V)-molybdate heteropoly acid [As(V)-MHPA] complex with molybdenum, followed by ion-pairing reaction with CYPHOS(R) IL 101 and microextraction in chloroform. Arsenic detection was performed by electrothermal atomic absorption spectrometry (ETAAS). Under optimum conditions, the analyte extraction efficiency was 99% and yielded a preconcentration factor of 125 with only 5.00 mL of sample. The detection limit was 0.002 mu g L(-1) as As(V). The relative standard deviation (RSD) for six replicate measurements at 1.5 mu g L(-1) of As were 4.1%, 4.9% and 5.0% for As(V), As(III) and total organoarsenicals, respectively. The proposed methodology was successfully applied for As speciation analysis in several types of water samples.
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