ORBECO SP600, Instruction Manual, Page: 186 / 334

184 SP600 Spectrophotometer 01/2008
1.1 Methods
Nitrite, HR
with Tube Test
0.3 – 3 mg/l N
1. Place the supplied blank (red label) in the sample cham-
ber making sure that the marks are aligned.
2. Press ZERO key.
3. Remove the vial from the sample chamber.
4. Add
0.5 ml of water sample
into one reaction tube.
5. Close the vial tightly with the cap and invert several
times to mix the contents.
6. Add
one level spoon of No. 8 (black) Nitrite-101
.
7. Close the vial tightly with the cap and swirl until the
reagent is solved completely.
8. Place the vial in the sample chamber making sure that
the marks are aligned.
9. Press
TEST
key.
Wait for a reaction period of 10 minutes .
After the reaction period is finished the measurement
starts automatically.
The result is shown in the display in mg/l Nitrite.
Ø 16 mm
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
Countdown
10:00
2 7 6