LaMotte AUXILIARY PHOSPHORUS TEST KIT APT - Manual (Page 4)

8. Quantitatively transfer the sample, which should be at room
temperature, to the 50 mL graduated cylinder (0418). After
transferring the solution from the flask to the graduated cylinder,
wash the flask with a little Deionized Water (5115PT) and add to the
solution in the graduated cylinder. Now dilute exactly to 50 mL using
Deionized Water (5115PT) and mix well.
9. Test the solution, from Step 8, for orthophosphate according to the
procedure given for the particular test outfit being used. This is
Reading C.
Reading C represents the total recoverable phosphorus including organic
phosphorus, but excluding particulate phosphorus.
Organic Phosphorus = Reading C - Reading B
D. PARTICULATE PHOSPHORUS
Follow the procedure for total phosphorus but do not filter the sample.
This is Reading D. Reading D represents particulate phosphorus.
Particulate Phosphorus = Reading D - Reading C
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