Hach DR/700 Procedures Manual page 191

COLOR, TRUE AND APPARENT
For water, wastewater and seawater
APHA Platinum-Cobalt Method*
1.
Assemble the
filtering apparatus
(membrane filter,
filter holder, filter
flask and aspirator).
Note: To test for
apparent color, do not
filter; omit Steps 1 to 3.
Note: If samples cannot
be analyzed
immediately, see
Sampling and Storage
following these steps.
4.
Fill a 10-mL cell
to the 10-mL line
with filtered
demineralized water
(the blank). Discard
the excess.
Note: For apparent
color, use unfiltered
demineralized water.
*Adapted from Standard Methods for the Examination of Water and Wastewater and
Wat. Res. Vol. 30, No. 11, pp. 2771-2775. 1996.
2.
Rinse the filter by
pouring about 50 mL
of demineralized
water through the
filter.
5.
Install module
45.01
in a DR/700.
45-19
Method 8025
(0 to 500 units)
3.
Pour another
50 mL of
demineralized water
through the filter.
6.
Press:
I/O
The display will show
450 nm
and module number
45.01