viii
81-48
PHOSPHORUS, REACTIVE, continued
4.
Fill a 10-mL cell to
the 10-mL line with
sample.
Note: For proof of
accuracy, use a 1.0 mg/L
Phosphate (0.33 mg/L P)
Standard Solution (listed
under Optional Reagents)
following these steps, in
place of the sample.
Note: Run a reagent blank
for this test. Use deionized
water in place of the
sample in Step 4. Subtract
this result from all test
results run with this lot of
PhosVer.
Note: Optional 25-mL
reagents sample may be
used (see Optional
Reagents).
5. Add the contents of
one PhosVer 3
Phosphate Powder
Pillow to the sample
cell (the prepared
sample). Cap and
invert several times to
mix.
Note: A blue color will
form if phosphate is
present.
6. Wait two minutes.
Note: An 8-10 minute
reaction period should be
used if determining total
phosphate following the
acid-persulfate digestion.
Note: If the sample
temperature is less than
15
O
C (59
O
C), allow 9
minutes of reaction time.
2 minutes
Illustration of
procedure steps
and instrument
keystrokes
required
Additional
information
that may be
applicable
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