DR/2400
Phosphorus, Total
PhosphorusTot_TNT_Other_PAP_Eng_Ody.fm Page 1 of 6
• For more accurate results, determine a reagent blank value for each new lot of reagent. Follow the procedure using deionized
water in place of the sample. Subtract the reagent blank value from the final results or perform a reagent blank adjust. See the
instrument manual for more information on Running a Reagent Blank.
• Place a safety shield in front of the COD reactor to prevent injury if splattering occurs.
• The test range for total phosphate is limited to 0.06 to 3.5 mg/L PO
4
3–
. Values greater than 3.5 mg/L may be used to estimate
dilution ratios, but should NOT be used for reporting purposes. If the value is greater than 3.5 mg/L, dilute the sample and repeat
the digestion and the colorimetric test.
• Final samples will contain molybdenum. In addition, final samples will have a pH less than 2 and are considered corrosive (D002)
by the Federal RCRA.
Phosphorus, Total
(Method 8190
PhosVer
™
3 with Acid Persulfate Digestion Method
Test ‘N Tube™ Vials
(0.06 to 3.50 mg/L PO
4
3–
or 0.02 to 1.10 mg/L P)
Scope and Application: For water, wastewater, and seawater; USEPA Accepted for reporting
wastewater analyses
1. Turn on the COD
reactor. Heat to 150 °C.
Place the safety shield in
front of the reactor.
2. Touch
Hach Programs.
Select program
536 P Total/AH PV TNT.
Touch
Start.
3. Use a TenSette
®
Pipet
to add 5.0 mL of sample
to a Total and Acid
Hydrolyzable Test Vial.
4. Use a funnel to add
the contents of one
Potassium Persulfate
Powder Pillow for
Phosphonate to the vial.
Tips and Techniques
Test ‘N Tube Method 8190
Hach Programs
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