the dissolution procedure employing conc HNO3 ad conc HF should be successful since you have the ratio 1:6 at least. After evaporation you should redissolve it repeatedly in conc HNO3, at least three times. I use this procedure routinely for all rocks and so far have not had any problems with non-dissolvable rests. For the measurements, be careful with internal standard used.
At 19:04 11.04.2003 +0900, you wrote:
>We want to analyze Be in saphire by ICP-MS. Microwave digestion with
>combination of either HCl and HF or HNO3 and HF has been tried, but no luck.
> I understand that a major element in saphire is an aluminum oxide.
>Is there any method to dissolve a saphire sample ? Thank you.
>Gae Ho Lee
>Department of Chemistry
>Dae Jeon, 305-764
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