I have been asked to analyse La, Gd, Dy and Ge in "special" silicate optical glasses
A typical stoichiometry is believed to be Gd9.2Dy0.05(SiO4)6O2
I have used standard geological HF/HNO3 digestion techniques but have had no success in dissolving this material.
Before I go down the Alkali fusion route does anyone have any experience of dissolving this type of material using standard mineral acids
Dept of Earth Sciences
University of Durham