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Dany
Yes LA is an option. Currently the sample is in powder form/partially processed in acid I could mount this residue on a surface but feel this is not totally practical. I am asking if some additional solid lumps/ fresh powder is available.
Similarly EDAX type techniques might be possible. 

Chris Ottley
Dept of Earth Sciences
University of Durham
UK
-----Original Message-----
From: PLASMACHEM-L: Analytical Chem.(ICP's, DCP's, MIP's). [mailto:[log in to unmask]] On Behalf Of Dany Savard
Sent: 31 March 2017 16:12
To: [log in to unmask]
Subject: Re: REE in optical glass

Hi Chris,
Don't you have access to a LA-ICP-MS ?

Dany



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-----Message d'origine-----
De : PLASMACHEM-L: Analytical Chem.(ICP's, DCP's, MIP's). [mailto:[log in to unmask]] De la part de OTTLEY, CHRISTOPHER J.
Envoyé : 31 mars 2017 10:25
À : [log in to unmask]
Objet : Re: REE in optical glass

Thanks all for your responses.
And reminding me of the problems of insoluble fluorides and Ge losses It looks like fusion might be the way to go, despite some of its inherent problems. However initially I was supplied with 10mg of sample. I will ask how much material is actually available

Thanks again

Chris Ottley
Dept of Earth Sciences
University of Durham
UK
-----Original Message-----
From: PLASMACHEM-L: Analytical Chem.(ICP's, DCP's, MIP's). [mailto:[log in to unmask]] On Behalf Of OTTLEY, CHRISTOPHER J.
Sent: 31 March 2017 12:34
To: [log in to unmask]
Subject: REE in optical glass

Dear All
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

Thanks

Chris Ottley
Dept of Earth Sciences
University of Durham
UK