LaMotte 1200 Colorimeter - Manual (Page 66)

PHOSPHATE PROCEDURE - ASCORBIC ACID METHOD
Read the 1200 Colorimeter Manual before proceeding. Carefully
wipe tubes dry before inserting into the colorimeter chamber.
PHOSPHATE
4. 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 blank
reading (0.0 ppm).
READ
ZERO
bla
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COLORIMETER
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READ
ZERO
bla
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 sample
blank or zero.
3.
Rinse and fill a
colorimeter tube
(0290) to the
10 mL line with
sample water. Cap
and wipe dry.
2.
Fill the Water
Sample Collecting
Bottle (0688) with
sample water. This
will be used to
dispense sample
water for the tests.
1.
Remove tube
from colorimeter.
Use 1.0 mL pipet
(0354) to add
1.0 mL of
*Phosphate Acid
Reagent
(V-6282). Cap
and mix.
5. 6.
Use the 0.1 g spoon
(0699) to add one
measure of *Phosphate
Reducing Reagent
(V-6283).
8. Align the index line with the
arrow on the meter, insert tube
CAL
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COLORIMETER
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READ
into chamber. Close
the lid. Push the
button.
Record results as
ppm
Orthophosphate.
READ
7.
Cap and shake until
powder dissolves.
Wait 5 minutes for
full color
development.
Solution will turn
blue if phosphates
are present. Wipe
tube dry.
L Mott
L Mott