Should this page be reduced to just a short description and the remainder merged into the Ammonia topic? There is some duplicated content and I think the Ammonia page is a good place to cover the relationship between free ammonia, ammonium and total ammonia.
I see nothing wrong with leaving it as is.
TAN is a separate glossary term and a quick description may be all that someone wants. If they want to learn more, the link to the Ammonia page is there. :)
P.S. please leave your signature in any discussion statement otherwise visitors have no idea who said that. :)
--Quatermass 04:45, 8 January 2012 (CST)
I had already edited it to remove some of the duplicate content. Check the history to see if appropriate. Brian Low 13:11, 8 January 2012 (CST)