ORBECO SP600, Instruction Manual, Page: 242 / 334

240 SP600 Spectrophotometer 01/2008
1.1 Methods
Silica HR / Silicon dioxide HR
with Powder Pack
1 – 100 mg/l SiO
2
1. Fill a clean vial (24 mm Ø) with 10 ml of the water
sample (Note 1), close tightly with the cap.
2. Place the vial in the sample chamber making sure that
the marks are aligned.
3. Press ZERO key.
4. Remove the vial from the sample chamber.
5. Add one Vario Silica Molybdate F10 powder pack
straight from the foil to the water sample.
6. Close the vial tightly with the cap and swirl several
times to mix the contents.
7. Add one Vario Silica HR Acid Rgt. F10 powder
pack
straight from the foil to the same water sample
(Note 2).
8. Close the vial with the caps tightly and swirl the vials
several times to mix the contents.
9. Press
[ ]
key.
Wait for a reaction period of 10 minutes .
After reaction period is finished proceed as follows:
10. Add
one Vario Silica Citric Acid F10 powder pack
straight from the foil to the water sample (Note 3).
11. Close the vial tightly with the cap and swirl several
times to mix the contents.
12. Place the vial in the sample chamber making sure that
the marks are aligned.
13. Press TEST key.
Wait for a reaction period of 2 minutes .
After reaction period is finished the measurement starts
automatically.
The result is shown in the display in mg/l Silica.
Countdown
2:00
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
Countdown
10:00
start:
1 2
3 4
3 5 2