ORBECO SP600, Instruction Manual, Page: 118 / 334

116 SP600 Spectrophotometer 01/2008
1.1 Methods
DEHA (N,N-Diethylhydroxylamin)
with Powder Pack
and Liquid Reagent
0.02 – 0.5 mg/l / 20 – 500 μg/l DEHA
Use two clean vials (24 mm Ø) and mark one as blank for
zeroing (Note 2).
1. Fill a clean vial with 10 ml deionized water (this is the
blank).
2. Fill the second clean vial with
10 ml of water sample
(this is the sample).
3. Add
one VARIO OXYSCAV 1 Rgt powder pack
straight from the foil into each vial.
4. Close the vials tightly and swirl several times to mix the
contents.
5. Add 0.20 ml VARIO DEHA 2 Rgt Solution to each vial
(Note 4).
6. Close the vials tightly and swirl several times to mix the
contents.
7. Press
[ ]
key.
Wait for a reaction period of 10 minutes (Note 5).
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. Press ZERO key.
10. Remove the vial from the sample chamber.
11. Place the vial (the sample) in the sample chamber ma-
king sure that the marks are aligned.
12. Press TEST key.
The result is shown in the display as DEHA.
Countdown 1
10:00
start:
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
1 2
3 4
1 6 7