Hach DR/700 - Page 701

81-27
PHOSPHORUS, REACTIVE, continued
10. Press: ZERO
The display will
count down to 0.
Then the display will
show 0.0 mg/L, and
the zero prompt will
turn off.
Note: For multiple
samples, zero on the
first sample and record
the blank value.
Subtract this value from
each sample result.
11. Remove the cap
from the vial.
12. Using a funnel,
add the contents of
one PhosVer 3
Phosphate Reagent
Powder Pillow for
10-mL samples to
the vial.
13. Cap tightly and
shake for 10-15
seconds.
Note: The powder will
not dissolve completely.
14. Wait 2 minutes 15. Clean the
outside of the sample
vial with a towel.
Note: Wiping with a
damp towel, followed by
a dry one, will remove
fingerprints or other
marks.
2 minutes