Hach DR/700 - COLOR, TRUE AND APPARENT; APHA Platinum-Cobalt Method*

45-19
Method 8025
COLOR, TRUE AND APPARENT (0 to 500 units)
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.
2. Rinse the filter by
pouring about 50 mL
of demineralized
water through the
filter.
3. Pour another
50 mL of
demineralized water
through the filter.
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.
5. Install module
45.01
in a DR/700.
6. Press: I/O
The display will show
450 nm
and module number
45.01
*Adapted from Standard Methods for the Examination of Water and Wastewater and
Wat. Res. Vol. 30, No. 11, pp. 2771-2775. 1996.