DR/2400
Phosphorus, Total
PhosphorusTot_TNT_High_MOL_Eng_Ody.fm Page 1 of 6
• Place a safety shield in front of the COD reactor to prevent injury if splattering occurs.
• Reagent blanks can be used more than once, but should not be used more than one day.
• The final samples will contain molybdenum. In addition, the final samples will have a pH less than 2 and are considered corrosive
(D002) by the Federal RCRA. Consult the Material Data Safety Data Sheet for information specific to the reagents used.
Phosphorus, Total
Method 10127
Molybdovanadate Method with
Acid Persulfate Digestion*
*Adapted from Standard Methods for the Examination of Water and Wastewater.
Test ‘N Tube™ Vials
HR (1.0 to 100.0 mg/L PO
4
3–
)
Scope and Application: For water and wastewater
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
541 P Total HR TNT.
Touch
Start.
3. Use a TenSette
®
Pipet
to add 5.0 mL of
deionized water to a Total
Phosphorus Test ‘N Tube
Vial (the blank).
4. Use a TenSette Pipet
to add 5.0 mL of sample
to a Total Phosphorus
Test ‘N Tube Vial
(the sample).
Tips and Techniques
Test ‘N Tube Method 10127
Hach Programs
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