360
5.
Add 2.0 mL of
5.0 N Sodium
Hydroxide Solution to
the prepared sample.
Swirl to mix.
Note: Use the 1-mL
calibrated dropper
provided.
6. Pour the prepared
sample into a graduated
cylinder. Add deionized
water rinsings from the
flask to return the
volume to 25 mL.
Proceed with the
appropriate reactive
phosphorus test.
Note: Results of the
reactive phosphorus test at
this point will include the
orthophosphate plus the
acid-hydrolyzable
(condensed) phosphate.
The condensed phosphate
concentration is
determined by subtracting
the results of a reactive
phosphorus test on an
untreated sample from this
result. Make sure both
results are in the same
chemical form and units.
PHOSPHORUS, ACID HYDROLYZABLE, continued
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