28
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.