ORBECO SP600, Instruction Manual, Page: 202 / 334

200 SP600 Spectrophotometer 01/2008
1.1 Methods
Ozone, in absence of Chlorine
with Tablet
0.02 – 0.5 mg/l O
3
1. Fill a clean 50 mm cell with water sample .
2. Place the cell in the sample chamber making sure that
the positioning is correct.
3. Press ZERO key.
4. Remove the cell from the sample chamber. Empty the
cell and dry completely.
5. Rinse a beaker with the water sample and empty it,
leaving a few drops remaining in the beaker .
6. Add one DPD No. 1 tablet and one DPD No. 3 tablet
straight from the foil and crush the tablet using a clean
stirring rod.
7. Add 10 ml of water sample and dissolve the tablets.
8. Fill the 50 mm cell with the colored test solution.
9. Place the cell in the sample chamber making sure that
the positioning is correct.
10. Press TEST key.
Wait for a reaction period of 2 minutes .
After the reaction period is finished the measurement
starts automatically.
The result is shown in the display in mg/l Ozone.
Notes:
see page 197
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
Countdown
2:00
2 9 9