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Solvent Extraction of Trace Mo(VI) in Natural Water Samples by Chelation and Ion-pairing
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1993, v.6 no.3, pp.289-296
Kim,
Y., Nho,
S., Choi,
J., &
Choi,
H.
(1993). Solvent Extraction of Trace Mo(VI) in Natural Water Samples by Chelation and Ion-pairing. Analytical Science and Technology, 6(3), 289-296.
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Abstract
The formation of Mo(VI)-alizarin red S chelate ion and its extraction into an organic solvent by ion-pairing were studied for the separative determination of trace Mo(VI) in natural water samples. Natural water 100mL was sampled in 250mL separatory funnel. After Mo(VI)-ARS chelate ion was formed by adding 0.01M alizarin red S solution 0.5mL to the water sample of pH 4.0, 0.2% aliquat-336 chloroform solution 10mL was added and the solution was vigorously shaked for about 30 seconds to from the ion-pair between Mo(VI)-ARS and aliquat-336, completely. The solution was stood for about 90 minutes. And the organic phase was taken for the absorbance measurement of the ion-pair at 520 nm. The content of Mo(VI) in sample was obtained from the standard calibration curve. Several extraction conditions such as pH, adding amounts of alizarin red S and aliquat-336, and shaking and standing times were optimized. This procedure was applied to the analysis of river and tap waters. It could be confirmed from the recoveries of over 99% in samples spiked with a given amount of Mo(VI) that this method was quantitiative in the determination of trace Mo(VI) in a natural water.
- keywords
- Trace Mo(VI), ion pair formation, solvent extraction, UV/Vis spectro photometry, alizarin red S
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