5
Nitrite (as NO
2
-
) Test Procedure
REMOVE STRIP
Remove one (1)
eXact
®
Strip Micro NO
2
, Part No.
486623
from the bottle before beginning the test.
Set the strip in a dry, convenient place and recap
the bottle immediately.
NO
2
NO2
1
2
5
3
7
6
TURN METER ON
Press the
ZERO/ON
button to power the meter on;
the display will show all annunciators, then the
current MENU selection, followed by the last
reading.
RINSE AND FILL CELL WITH SAMPLE
Rinse the
CELL
at least 3 times with the water sample
you will be testing - rinsing minimizes the potential for
FURVVFRQWDPLQDWLRQIURPDSUHYLRXVWHVW)LQDOO\¿OO
cell to capacity with the water sample.
SELECT TEST: NO2
Press and re-press the
MENU
button until the
display shows the parameter
NO2
.
Dip the
eXact
®
Strip Micro NO
2
, Part No. 486623
into the
CELL
and immediately press
READ
. This
starts the
20 SECOND
countdown timer. During
this time move the strip in a gentle back and forth
motion (approx. 2 strokes/sec).
Remove and
discard the strip after “1” on the display
disappears*
. The meter will automatically start to
count up for 360 seconds (6 minutes).
DIP STRIP AND PRESS “READ”
RECORD RESULT DISPLAYED
After the 360 seconds, the cursor will automatically
move across the display while the meter prepares to
measure the sample. Record result displayed (this
result is automatically stored in NO2 Menu).
Press the
ZERO/ON
button. The cursor will move
across the display followed by
0.00 PPM
. Sample
is ready for testing.
ZERO METER*
To determine Nitrite value as Nitrogen (NO
2
-
as N) as used by USEPA, multiply the result by 0.3045.
*
NOTE: When testing outdoors (sunlight), for best accuracy, use the Mixing Cap/Cell Cover when Zeroing and Reading the sample.
NOTE: Nitrite reacts with chromotropic acid and sulfanilamide in acid media and forms a pink color, directly proportional to Nitrite concentration.
4
