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phosphate test

---------- Forwarded message ----------
Date: Sat, 10 May 1997 08:39:34 -0700
From: Mike Shifflet <shiffty at ptd_net>
To: Aquatic-Plants at actwin_com
Subject: phosphate determination


	I am an analytical chemist and I have been working with a 
colorimeteric method to determine phosphate in water.  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.  
	Thanks in advance.

Mike Shifflet
shiffty at ptd_net