Hanna Instruments HI 83225-01 - Manual (Page 29)

29 Ammonia LR
• Remove the cuvette.
• Add 4 drops of HI 93715A-0 First Reagent (6 drops for seawater
analysis). Replace the cap and mix the solution by inverting the
cuvette a couple of times.
• Add 4 drops of HI 93715B-0 Second Reagent (10 drops for seawater
analysis). Replace the cap and mix the solution by inverting the
cuvette a couple of times.
• Reinsert the cuvette into the instrument.
• Press Timer and the display will show the countdown prior to the
measurement or, alternatively, wait for 3 minutes and 30 seconds
and press Read. When the timer ends the meter will perform the
reading. The instrument displays the results in mg/L of ammonia
nitrogen (NH
3
-N).
• Press or to access the second level functions.
• Press the Chem Frm key to convert the result in mg/L of ammonia (NH
3
) and ammonium (NH
4
+ ).
• Press or to return to the measurement screen.
INTERFERENCES
Interference may be caused by: acetone, alcohols, aldehydes, glycine, hardness above 1 g/L, iron, organic
chloramines, sulfide, various aliphatic and aromatic amines.