Phosphorus, Total
Phosphorus, Total
Page 2 of 6
PhosphorusTot_TNT_High_MOL_Eng_Ody.fm
5. Use a funnel to add
the contents of one
Potassium Persulfate
Powder Pillow for
Phosphonate to each vial.
Cap tightly and shake to
dissolve.
6. Place the vials in the
COD Reactor.
7. Touch the timer icon.
Touch
OK.
A 30-minute heating
period will begin.
8. After the timer beeps,
carefully remove the hot
vials from the reactor.
Place them in a test tube
rack and allow to cool to
room temperature
(18–25 °C).
9. Use a TenSette Pipet
to add 2.0 mL of 1.54 N
sodium hydroxide to
each vial.
Cap and invert to mix.
10. Use a polyethylene
dropper to add 0.5 mL of
Molybdovanadate
Reagent to each vial.
Cap and invert to mix.
11. Touch the timer icon.
Touch
OK.
A 7-minute reaction
period will begin.
Read the sample within
seven to nine minutes
after adding the
Molybdovanadate
Reagent.
12. Wipe the vials with a
damp towel, followed by
a dry one, to remove
fingerprints or other
marks.
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