Abstract
Gallium garnet crystals containing rare earth elements were decomposed in a sealed teflon vessel either with sulfuric acid at 200°C for 16h or with hydrochloric acid at 140°C for 16h. Gallium was separated chromatographically by anion exchange resin from other elements in the sample solution, and determined by titration with EDTA. Gadolinium, scandium, yttrium, lanthanum and lutetium in the sample solution were determined by direct or back titration. with EDTA, and neodium and chromium by spectrophotometry. Analytical results of eight samples are presented.
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