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KMID : 1059519890330030304
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Journal of the Korean Chemical Society
1989 Volume.33 No. 3 p.304 ~ p.308
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Study on the Spectrophotometric Determination of Some Rare Earths
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Cha Ki-Won
Jeong Eui-Sik
Lee Joung-Hae
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Abstract
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The spectrophotometric determination of Lu3+, Eu3+ and some other rare earths have been investigated using Methyl Thymol Blue(MTB) as spectrophotometric reagent. Rare earth elements form a stable complex with MTB abount pH 6.5 and the ratio of its complex is 1 to 1. MTB has a absorption maxima at 440nm and rare earth MTB complex has absorption maxima 610nm at pH 6.5, respectively. The absorbance of the rare earth MTB complex is stable in 7 hours after color developing and obey the Beer law in the range of 0∼110㎍/50ml. The ligand such as phosphate, citrate and EDTA decrease the absorbance of its complex considerably, and this method has a poor selectivity of each rare earth element and the molar absorptivity is 1.2 - 2.0× 104mol-1·l·cm-1. In methyl alcohol, ethyl alcohol and acetone medium we did not find out any absorption change of the rare earth MTB complex.
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KEYWORD
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