Present state of complexometry-IV Determination of rare earths

A review of the visual complexometric determination of the rare earths, scandium and yttrium with various volumetric reagents is presented. As in previous parts attention is paid to the complexometric behaviour of these metals and to the problems of interferences in their determinations. Methods for the determination of thorium, scandium and some rare earths in mixtures are described in detail. Recent developments and further possibilities in this field are discussed.