Rare earths in alloys

This is an alloy of about 50% cerium, 25% lanthanum, 15% neodymium and 10% other rare earth metals. 

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Although applications of this method to the determination of the lanthanides are limited in scope, it has proved useful in the precise determination of selected rare earths in alloys where the approximate composition was known, and in the direct determination of purity of rare earth oxides. One of the major advantages of the method is the compensation for any errors introduced in the spec-trophotometric measurement itself since the standard and unknown solutions are affected to nearly the same extent. 

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