LaMotte 1200 Colorimeter - Manual (Page 58)

NITRATE-NITROGEN TEST PROCEDURE -
CADMIUM REDUCTION METHOD
Read the 1200 Colorimeter Manual before proceeding. Carefully
wipe tubes dry before inserting into the colorimeter chamber.
NITRATE - NITROGEN
2
Insert the tube
into the
chamber, being
sure to align the
index line with
the arrow on
the meter.
Close the lid.
This tube is the
blank or zero.
8.
5.
3. 4.
Fill the Water
Sample Collecting
Bottle (0688) with
sample water. This
will be used to
dispense sample
water for the tests.
Rinse and fill a
colorimeter tube
(0290) to the 10
mL line with
sample water.
Cap and wipe
dry.
1. 2.
I200
COLORIMETER
••••••••••••••••••
READ
bla
ZERO
7.
Remove tube from
colorimeter and
pour off 5 mL into
graduated cylinder
or similar. Discard
the remaining
sample.
6.
Pour the 5 mL
sample from a
graduated
cylinder or
similar into the
colorimeter
tube.
Push the
button to turn the
meter on. Press the
button
and hold it for 2
seconds until
is
displayed. Release
the button to take a
zero reading
(0.00 ppm).
READ
ZERO
bla
Use the graduated
cylinder or similar to
measure 5 mL of
*Mixed Acid
Reagent (V-6278)
and add to tube.
5 mL
5m
L
2
MINUTES
5 mL
Cap and mix. Wait approximately 2
minutes before proceeding to Step 9.
L Mott