ORBECO SP600, Instruction Manual, Page: 240 / 334

238 SP600 Spectrophotometer 01/2008
1.1 Methods
Silica LR / Silicon dioxide LR
with Powder Pack
and Liquid Reagent
0.1 – 1.6 mg/l SiO
2
Use two clean vials (24 mm Ø) and mark one as blank for
zeroing.
1. Fill each vial with 10 ml of water sample .
2. Add
0.5 ml Vario Molybdate 3 reagent solution
into
each vial.
3. Close the vials tightly and swirl several times to mix the
contents (Note 1).
4. Press
[ ]
key.
Wait for a reaction period of 4 minutes (Note 2).
After reaction period is finished proceed as follows:
5. Add one Vario Silica Citric Acid F10 Powder Pack
straight from the foil into each vial.
6. Close the vials tightly and swirl several times to mix the
contents.
7. Press [ ] key.
Wait for a reaction period of 1 minute (Note 3).
After reaction period is finished proceed as follows:
8. Place the vial (the blank) in the sample chamber making
sure that the marks are aligned.
9. Add
one Vario LR Silica Amino Acid F F10 Powder
Pack straight from the foil into the vial (the sample).
10. Close the vial tightly with the cap and swirl several
times to mix the contents.
Countdown
4:00
start:
Countdown
1:00
start:
1 2
3 4
3 5 1