Studies on the Determination of Heavy Metal Ions by Flow Injection, the Photochemical Characterization and Polymerization of Eight-Coordinated Complex(Part I): Spectrophotometric Determination of Uranium and Thorium Ions by Flow Injection Analysis using Chrome Azurol S in the Presence of Surfactant

금속이온의 흐름주입법에 의한 정량, 8-배위착물의 광학적 특성 및 중합체에 관한 연구(제1보): 계면활성제 존재하에서 Chrome Azurol S를 사용하여 우라늄 및 토륨이온의 흐름 주입법에 의한 분광광도 정량

  • 장주환 (한남대학교 이과대학 화학과) ;
  • 강삼우 (한남대학교 이과대학 화학과) ;
  • 손병찬 (배재대학교 이과대학 화학과) ;
  • 조광희 (한남대학교 이과대학 화학과)
  • Received : 1994.08.25
  • Published : 1995.03.25

Abstract

Spectrophotometric determination of U(VI) and Th(IV) by Flow injection method is described. Chrome Azurol S forms water soluble complexes with U(VI) and Th(IV) in the presence of cethyltrimethylammonium bromide. The maximum adsorption of U(VI) and Th(IV) complexes are at 600nm with molar absorptivity of $2.3{\times}10^5Lmol^{-1}cm^{-1}$ and 611nm with molar absorptivity of $3.8{\times}10^5Lmol^{-1}cm^{-1}$ in acetate buffer medium having pH 5.0 and 5.5. The calibration curves of U(VI) and Th(IV) are linear over the range of 0.1~0.8ppm and the correlation coefficients are ca. 0.9960 and 0.9930 respectively. The detection limits(S/N) are 20ppb for U(VI) and 15ppb for Th(IV). The relative standard deviation are ${\pm}1.8%$ for U(VI) and ${\pm}2.1%$ for Th(IV). The sample throughput was ca. $50hr^{-1}$.

Keywords

Flow Injection;Spectrophotometry;Uranium and Thorium;Chrome Azurol S;CTAB

Acknowledgement

Supported by : 교육부 기초과학연구소