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DR/2400
Method 8025
Scope and Application:
and paper effluent using 465 nm (requires pH adjustment)
* Adapted from Standard Methods for the Examination of Water and Wastewater and NCASI, Technical Bulletin No. 253, Dec. 1971
** Adapted from Wat. Res. Vol. 30, No. 11, pp. 2771–2775, 1996
Tips and Techniques
• NCASI procedure requires pH adjustment. Adjust the pH to 7.6 with 1.0 N HCl or 1.0 N NaOH. When adjusting the pH, if overall
volume change is greater than 1%, start over and use a stronger acid or base.
• Wipe the outside of sample cells before each insertion into the instrument cell holder. Use a damp towel followed by a dry one to
remove fingerprints or other marks.
• To test for apparent color, omit steps 3, 4, 5, and 7. Do not filter the sample. Use unfiltered deionized water for the blank.
Hach Programs
1.
Touch
.
Hach Programs
Select program
120 Color, 455 nm
or
.
125 Color, 465 nm
Touch
.
Start
Note: Use Hach program 125
when performing the NCASI
procedure.
ColorTru_None_Other_PCS_Eng_Ody.fm
For water, wastewater, and seawater; equivalent to NCASI method 253 for pulp
2.
Collect 200 mL of
sample in a 400-mL
beaker. For the NCASI
procedure, adjust the pH
as described above.
Color, True and Apparent
Platinum-Cobalt Standard Method* **
3.
Assemble the filtering
apparatus (0.45 micron
membrane filter, filter
holder, filter flask, and
aspirator).
Note: NCASI prescribes a
0.8-micron filter.
(5 to 500 units)
Method 8025
4.
Rinse the filter by
pouring about 50 mL of
deionized water through
the filter. Discard the
rinse water.
Color, True and Apparent
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