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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 24, Number 12
BKCSDE 24(12)
December 20, 2003 

Determination of Co(II) Ion as a 4-(2-Thiazolylazo)resorcinol or 5-Methyl-4-(2-thiazolylazo)resorcinol Chelate by Reversed-Phase Capillary High-Performance Liquid Chromatography
Yongsoon Chung*, Wonseog Chung
Capillary-HPLC, Co(II) ion, 4-(2-Thiazolylazo)resorcinol(TAR), 5-Methyl-4-(2-thiazolylazo) resorcinol(5MTAR)
Determination of Co(II) ion as a 4-(2-thiazolylazo)resorcinol(TAR) or 5-methyl-4-(2-thiazolylazo)resorcinol(5MTAR) chelate was accomplished by reversed-phase capillary high-performance liquid chromatography (RP-Capillary-HPLC) using a Vydac C4 column and MeCN-water mixture as mobile phase. The effect of change in pH and MeCN percentage of the mobile phase on the retention factor, k and peak intensity were evaluated. It was found that 30% MeCN (v/v) of pH 5.60 or 7.20 was adequate as mobile phase when TAR or 5MTAR is used. Detection limit (D.L., S/N=3) in each case was 2.0 × 10-7 M (11.8 ppb) and 3.0 × 10-7 M (17.7 ppb). The Co(II) ion in mineral and waste water was determined with the optimum column and mobile phase.
1781 - 1784
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