Caution re sodium polytungstate (let me know if you have found otherwise)

As I understand it, you can burn the sodium polytungstate and ruin it.  The
company that I get my sodium polytungstate from (Poly-gee)said that the
solution should  not be heated above 70 degrees C, and that the water
should not be boiled off.  I leave mine in an oven at 60 degrees C to
evaporate the water off.  Perhaps this is overly cautious, however.  Has
anyone boiled off the water without problems?

Francesca

>The dilute sodium polytungstate solution can be enriched again by
>evaporation on a hot plate.
>Concentrates should be cleaned with lots of water.
>
>Hope that helps,
>
>Ana-Voica Bojar