Solvent Extraction of Trace Mo(VI) in Natural Water Samples by Chelation and Ion-pairing

킬레이트 및 이온쌍 형성을 이용한 자연수 중 극미량 Mo(VI)의 용매추출

  • 김영상 (고려대학교 자연과학대학 화학과) ;
  • 노승구 (고려대학교 자연과학대학 화학과) ;
  • 최종문 (고려대학교 자연과학대학 화학과) ;
  • 최희선 (수원대학교 이과대학 화학과)
  • Received : 1993.06.05
  • Published : 1993.08.25

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

Acknowledgement

Supported by : 한국과학재단