Abstract
The indirect determination of rare earth elements by inverse voltammetry is possible by displacement reactions. The displacement of zinc from Zn-diethylenetriaminepentaacetic acid complexes and Zn-ethylenediaminetetraacetic acid complexes is used for the determination of lanthanum, neodymium, samarium, dysprosium, and lutetium. Zinc is displaced quantitatively from Zn-DTPA by rare earth elements. With Zn-EDTA the reaction is quantitative only with rare earth elements of high atomic number, unless ammonia is present. Methods for the determination of the sum of all rare earth elements and for the determination of a single rare earth element in the concentration range between 10 −7 and 10 −6 M are discussed.
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