Hanna Instruments HI 83214 - Manual (Page 23)

23
4
Ammonia HR
• Press the Zero key. The display will show “-0.0-” when the meter is zeroed and ready for
measurement.
• Remove the vial.
• Remove the cap and add 4 drops of HI 93764-0 Nessler
Reagent.
• Replace the cap tightly and mix by inverting the vial a couple
of times. This is the sample.
• Place the vial into the holder and push it completely down.
• Press Timer and the display will show the countdown prior to
the measurement and the message “ Reaction Time”.
Alternatively, wait for 3 minutes and 30 seconds and press
Read. The instrument will perform the reading.
• The instrument displays concentration in mg/L of ammonia nitrogen (NH
3
-N). Press ▲ or ▼ to
convert the result in mg/L ammonia (NH
3
).
INTERFERENCES
Interference may be caused by:
• Organic compounds like: chloramines, various aliphatic and aromatic amines, glycine or urea above 100 ppm.
To eliminate these interferences distillation is required.
• Organic compounds like: aldehydes, alcohols (e.g. ethanol) or acetone above 1 %.
To eliminate these interferences distillation is required.
• Sulfide: may cause turbidity.