Dear Stefan,

Please see the attached literature found via Internet search which may help you on your search.

Cheers,

Konstantine

http://www.ncbi.nlm.nih.gov/pubmed/21132205

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3547493/

Hello Konstantine,

thanks a lot. Yes, most of the papers I found deal with the standards only (ammonium, nitrite, nitrate, phosphate). However, it is nice to have something concerning copper and iron now!

I thought that there might be more papers summarizing new colorimetric methods developed within the last few years, especially for all the mico- and macro nutrients listed above.

For water analysis of ammonium, we usually measure total ammonia nitrogen (TAN), the best method is salicylate method  (see paper Bower, Carol E., and Thomas Holm-Hansen. "A salicylate-hypochlorite method for determining ammonia in seawater." Canadian Journal of Fisheries and Aquatic Sciences 37, no. 5 (1980): 794-798.)  This method is widely used in saline water, my recent research shows it is also a good choice for freshwater.

Hello

I realize my old question and this topic is still interesting to some researchers, thus I want to inform you:

In June 2015, we bought a "machine" for colorimetric water analysis, the chemicals for various elements/nutrients and the sandards for calibrating are sold from the same company. The machine costs around 50,000 Euro. We can test a lot in more or less short time... So far, we are satisfied. If somebody needs the machines or companies name, send me a message...

All the best,

Stefan