Abstract
The higher derivative UV absorption spectra of Ce 3+ and Gd 3+ in perchloric acid solution have been studied. Both the sensitivity and selectivity of the derivative absorption bands of these ions are much better than those of the normal absorption bands. Fe 3+ and all the other rare earths do not interfere with the fourth-derivative band for Gd 3+ at 270.9(−) nm. The second-derivative band of Ce 3+ (235.6(−) − 244.2(+) nm) only has a very slight interference from Ho 3+ that can be corrected by using a correction factor. It is observed that the temperature of the solution has an influence on the height of the derivative peak, but this influence can be compensated for. The accuracy of the present method has been tested with a synthetic sample (a mixture of fifteen rare earths), the relative errors of all analytical results are smaller than 1%. This method has been applied to direct determination of Ce 3+ and Gd 3+ in natural mixtures of rare earth oxides with satisfactory results.
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