21
METHOD PROCEDURE
• Insert the cuvette into the holder and ensure that the
notch on the cap is positioned securely in the groove.
• Press
Read
. The display will show a 15 minute countdown prior to the measurement.
To skip the timer, press
Read
twice
.
When the timer ends, the meter will perform
the reading. The instrument displays concentration in
µg/L
of
nitrite-nitrogen
(NO
2
-
-N)
.
• Press the
key and use the functional keys to select
Chemical Form
.
• Use the functional keys and press
Select
to change the displayed chemical formula
to
µg/L
of
nitrite (NO
2
-
)
and
sodium nitrite (NaNO
2
)
.
INTERFERENCES
Interference may be caused by:
• Antimonious, Auric, Bismuth, Chloroplatinate ions, Cupric, Iron (Ferric), Iron
(Ferrous), Lead, Mercurous, Silver, Strong reducing or oxidating agents
• Nitrate above 100 mg/L could yield falsely-high readings
