Hach DR/700 Procedures Manual page 700

PHOSPHORUS, REACTIVE,
4.
Fill a Test 'N Tube
Cuvette vial with 5
mL of sample.
Note: For proof of
accuracy, use a 1.0 mg/L
Phosphorus as
phosphate (0.33 mg/L P)
Standard Solution (see
Optional Reagents) in
place of the sample.
Note: Run a reagent
blank for this test. Use
demineralized water in
place of the sample.
Subtract this result from
all test results run with
this lot of PhosVer.
7.
Fully insert a
COD Vial Adapter
into the cell holder
with the tabs in the
square slot.
5.
Add 4 mL of
demineralized water
to the sample vial.
8.
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.
81-26
continued
6.
Cap tightly and
shake to mix.
9.
Place the sample
vial in the adapter
with the Hach logo
facing the front of the
instrument.