Hello all,

I'm wanting to use tungsten in some experiments, but so far the best precursor I can find is ammonium metatungstate, which would work fine, but apparently, nobody knows how hydrated these polytungstates are, so I can't readily make a precise molar solution. Some sources sell specific hydrates, but only when purchasing the 99.9+% purity sources, which I'm trying to avoid due to higher associated cost.

I'm scrounging the literature for ways around this, but in the meantime, does anyone have suggestions for drying meta/para-tungstates (without decomposing them :), or perhaps an alternate tungsten source?

Thanks,

Billy McCulloch