These portable photometers are
for the measurement of ammonia
nitrogen in freshwater samples.
Signi<cance of Use
Present naturally in surface and
wastewaters, ammonia mainly results
from the deamination of organic nitrogen-
containing compounds and hydrolysis
of urea. Ammonia may also be present
from water treatment processes that
utilize chloramines for disinfection,
where ammonia is added to the water
to react with chlorine. Ammonia is
less likely to appear in groundwater
due to adsorption to soil particles.