Water Environment Federation (WEF) Discussion ForumsWater Environment Federation (WEF) Discussion Forumshttp://www.wef.org/TechnicalDiscussions/jfuller@wef.orgWed, 19 Nov 2008 12:07:52 GMT20http://www.wef.org/TechnicalDiscussions/Topic4755-5-1.aspxThe phosphate reacts with molybdenum under reducing conditions to form a polymeric substance, generically known as a "molybdenum blue." It is not a true solution, but a colloid, which accounts for the sharply limited linear working range of the method.</P><P>The antimony that is generally added at trace levels is a catalyst, that accelerates the rate at which equilibrium is attained.Fri, 01 Jun 2007 11:25:41 GMTDedalushttp://www.wef.org/TechnicalDiscussions/Topic4755-5-1.aspx<div class="Quote">Anyone know the chemical reaction that takes place during this test? </div><br>Which method are you talking about?Fri, 20 Apr 2007 10:11:14 GMTJeff Naumannhttp://www.wef.org/TechnicalDiscussions/Topic4755-5-1.aspxAnyone know the chemical reaction that takes place during this test? Mon, 16 Apr 2007 17:57:37 GMTRayn