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In a message dated 97-05-11 03:49:18 EDT, Aquatic-Plants-Owner at actwin_com
(Aquatic Plants Digest) writes:
<< The method reacts
a solution of ammonium molybdate, bismuth subnitrate and ascorbic acid
with phosphate to form a blue color. What I sould like to know is what
is the reaction that forms the blue color? If you know of a reference
could you let me know. >>
I know that phosphomolydate plus ascorbic acid yields a colored product.
It's the basis of the Ames ascorbic acid test sticks. I don't know the
mechanism for the generation of phosphomolybdate from ammonium molybdate.