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> Just to be sure, do you see an increase in the Si concentration when
> the H2O is included in the matrix correction? . . .
I'll have the researcher check his data files for this -- I believe
so. And I see that effect in my rhyolite glass samples.
> Finally, did you perform an area peak factor correction for the
> oxygen measurement relative to your oxygen standard? . . .
I'd have to check on that. I know that three different standards for
oxygen gave essentially the same result. But I'll check...
> I guess the other question is what oxygen mass absorption
> coefficient did you use? . . .
It should be the standard value in JEOL's data -- I'll check that too.
> I'm guessing that you will find the low totals being due to a number
> of small effects rather than a single large effect.
That, of course, is another distinct possibility.