1.1 Methods
Phosphonates
Persulfate UV oxidation method
with Vario Powder Pack
0 – 125 mg/l (see Table 1)
1. Choose the appropriate sample volume from table 1
(see following pages).
2. Pipette the chosen sample volume into a clean 50 ml
graduated cylinder. If necessary fill up with deionised
water to the 50 ml mark and mix well.
3. Fill a clean vial (24 mm Ø) with 10 ml of the prepared
water sample (this is the blank).
4. Transfer 25 ml of the prepared water sample into
the digestion vial.
5. Add the contents of one Vario Potassium Persulfate
F10 Powder Pack straight from the foil to the digestion
vial.
6. Close the digestion vial tightly with the cap and swirl
until the reagent is dissolved completely.
7.
Insert the UV lamp into the digestion vial (Note 3, 4, 5).
CAUTION: Wear UV safety goggles
!
8. Switch the UV lamp on and wait for a reaction period
of 10 minutes.
9. After the reaction period is finished switch the UV lamp
off and remove the lamp from the vial.
10. Fill a second vial (24 mm Ø) with 10 ml of the digested
sample (this is the sample).
11. Add the contents of one Vario Phosphate Rgt. F10
Powder Pack straight from the foil into each vial (blank
and sample).
12. Close the vials tightly with the cap and swirl gently
several times (30 sec.).
(Note 6)
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