Just wanted to share my adopted analytical detection method for ammonia in water. It takes advantage of ultra-sensitive colorimetric reaction of
Nessler's reagent with free form ammonia cation NH4+. The reagent itself can be obtained from pharmacy stores or good colleague from analytical chemistry at Your local school/university
. It is meant especially for hardcore :mad:water-testers that spend a lot $$$ on tetra, sera etc... test that are based on ninhydir/ammonia reaction. I say:
TRY BEFORE YOU BUY !
As I've said the reaction is ultra-sensitive allowing detection of approx. 1.5 micro gram in one drop of water (approx. 10 micro litres), what can be translated into -> 0.9 mg/l concentration.
In other words: if Your solution turns yellow/red/brown... You are in trouble and your tank starts accumulating ammonia...!
Please find attached photo with tested chemical assay for different ammonia/water solutions.
Enjoy the beauty of science ...
Tested solutions:
pure H2O : 0.9 mg/l : 90mg/l : 18g /l
DIY ammonia test 
(old member joke)
I'm working on some additional colorimetric reactions. I'm looking around for some cheap/obtainable chemicals that can be successfully used in water testing. One can save some extra $$$ and allocate this many for some nice fish or corals ... It's the Dutch way of thinking ... 
