DR/2400
Phosphorus, Total, Digestion
PhosphorusTot_PP_Other_APD_Eng_Ody.fm Page 1 of 4
• Rinse all glassware with 1:1 Hydrochloric Acid Solution (Cat. No. 884-49). Rinse again with deionized water.
• The results of the reactive phosphorus test after the digestion will include the organic phosphate plus the orthophosphate and the
acid-hydrolyzable (condensed) phosphate. The organic phosphate concentration is determined by subtracting results of an acid
hydrolyzable phosphorus test from this result. Make sure that both results are in the same units, either mg/L PO
4
3–
or mg/L P
before subtracting.
Phosphorus, Total, Digestion
(Method 8190
Acid Persulfate Digestion Method*
*Adapted from Standard Methods for the Examination of Water and Wastewater 4500-P B & E
Scope and Application: For water, wastewater, and seawater; USEPA Accepted for wastewater analyses
1. Use a graduated
cylinder to measure
25 mL of sample. Pour
the sample into a 125-mL
Erlenmeyer flask.
2. Add the contents of
one Potassium Persulfate
Powder Pillow.
Swirl to mix.
3. Use a 1-mL calibrated
dropper to add 2.0 mL of
5.25 N Sulfuric Acid
Solution to the flask.
4. Place the flask on a
hot plate. Boil gently for
30 minutes.
Do not boil dry.
Concentrate the sample to
less than 20 mL for best
recovery. After
concentration, maintain
the volume near 20 mL by
adding small amounts of
deionized water. Do not
exceed 20 mL.
Tips and Techniques
Powder Pillows Method 8190
HRS MIN SECHRS MIN SEC
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