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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 15, Number 4
JKCSEZ 15(4)
August 20, 1971 

Determination of the Formation Constants of Metal Complexes with Organic Acids by Adsorption Method

흡착법에 의한 금속이온과 유기산간의 착염 생성계수의 측정법
Won Mok Jae

The adsorption method for the determination of the formation constants of the metal complexes with organic acids was developed by using membrane filters. The adsorption method involved the measurements of radioactivities of the adsorbed metal on membrane filters and the filtrate solution after the radioactive metal ion were filtered through membrane filters in the presence of organic ions of varying concentration. Comparing the adsorption method with the ion exchange method, it was seennthat the adsorption method was simpler and faster than the ion exchange method. As an example of the metal complex with organic acid yttrium citrate complex was chosen, and the formation constant of the complex obtained by the adsorption method showed Kf = 2.0×10-4(l. mole-1) at a pH of 7. Also the present study revealed that the carrierfree state of yttrium in aqueous solution was present in the completely ionized state.
199 - 203
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