Hach POCKET COLORIMETER II Instruction Manual page 41

3.
Fill a mixing bottle to the
shoulder with the diluted
sample (approximately
25 mL).
4.
Fill a sample cell with 10
mL of diluted sample (the
blank) from the flask.
1—41
Phosphonates,
5.
Add the contents of one
Potassium Persulfate for
Phosphonate Powder Pillow
to the mixing bottle. Swirl
to mix.
continued