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KMID : 0385520010140040371
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Analytical Science & Technology
2001 Volume.14 No. 4 p.371 ~ p.375
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Studies on the Stability constants of complexes between rare earth elements and ethylenediaminediacetic acid
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차기원/Cha KW
현인성/최현철/Hyun IS/Choi HC
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Abstract
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The stability constants of complexes between rare earth elements(Yb, Dy, Sm, Nd, Pr, Ce, La) and ethylenediaminediacetic acid(EDDA) have been measured for the separation of rare earth elements by potentiometric method. The pk₁s of MA+ complexes are in the range of 8.80-6.72 and the pk₂s of MA-₂ complexes are in the range of 7.43-4.37. The magnitude sequences of the stability constants are the reverse of the ionic size of rare earth elements.
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