Preconcentration and Determination of Trace Cobalt and Nickel by the Adsorption of Metal-PDC Complexes on the Anion-Exchange Resin Suspension

금속-PDC 착물의 음이온교환 수지 상 흡착에 의한 흔적량 코발트와 니켈의 동시 예비농축 및 정량

  • Han, Chul-Woo (Department of Chemistry, Korea University) ;
  • In, Gyo (Department of Chemistry, Korea University) ;
  • Choi, Jong-Moon (Department of Fire Protection & Security Management, Tong-Hae College) ;
  • Kim, Sun Tae (Advanced Analysis Center, Korea Institute of Science and Technology) ;
  • Kim, Young-Sang (Department of Chemistry, Korea University)
  • 한철우 (고려대학교 대학원 소재화학과) ;
  • 인교 (고려대학교 대학원 소재화학과) ;
  • 최종문 (동해대학 소방안전관리과) ;
  • 김선태 (한국과학기술연구원 특성분석센터) ;
  • 김영상 (고려대학교 대학원 소재화학과)
  • Received : 2000.07.28
  • Published : 2000.10.25

Abstract

A determination method of trace nickel and cobalt in water samples was studied and developed by adsorbing their complexes on ion exchange resin suspension. The analytical ions were formed as complexes with a ligand of APDC (ammonium pyrrolidinedithiocarbamate) and adsorbed on anion exchange resin of Dowex 2-X8. After the suspension was filtered out with membrane filter, the complexes were dissolved in HCl solution by an ultrasonic vibrator for ET-AAS determination. Several conditions were optimized as followings. pH of sample solution: 5.0, amount of ligand APDC: more than 430 times in mole ratio, the type and concentration of acid: 0.1 M HCl, and vibration time: 7 minutes. The addition of palladium in the HCl solution could improve the reproducibility and sensitivity by a matrix modification in the absorbance measurement. This procedure was applied for the analysis of three kinds of real water samples. The detection limits equivalent to 3 times standard deviation of blank were Co 0.36 ng/mL and Ni 0.27 ng/mL and recoveries in spiked samples were 99-102% for cobalt and 100-105% for nickel.

Keywords

preconcentration of trace cobalt and nickel;determination of trace cobalt and nickel;adsorption separation of metals;anion exchange resin suspension

Acknowledgement

Supported by : 한국과학재단

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