Hanna Instruments HI 83215-2008 Series - Manual (Page 24)

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• 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.
Ammonia HR