[Jaine Perotti]

Originally Posted by Nato

Oddly enough I've actually spent the last few weeks looking for almost exactly the same thing.

I'll be following this thread if anyone else has ideas.

EDIT: Forgot this, but this claims to be a Nitrate-sensitive probe: http://www.vernier.com/products/sens...rodes/no3-bta/

Vernier also makes a NH4-sensitive probe but if you want to estimate NH3 you will have to acidify the sample.

Wicked cool. I just wish I could find a cheaper way to do chemical analysis of this stuff...