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- E-ISSN 2288-8985
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Preconcentration and Determination of Trace Cobalt and Nickel by the Adsorption of Metal-PDC Complexes on the Anion-Exchange Resin Suspension
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2000, v.13 no.5, pp.608-615
Han,
C., In,
G., Choi,
J., Kim,
S. T., &
Kim,
Y.
(2000). Preconcentration and Determination of Trace Cobalt and Nickel by the Adsorption of Metal-PDC Complexes on the Anion-Exchange Resin Suspension. Analytical Science and Technology, 13(5), 608-615.
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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
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