Thermo Scientific AQUAfast AQ3700, User Manual

Page: 61 / 264

Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
Chlorine dioxide
in absence of Chlorine
with Tablet
0.05 – 11 mg/l ClO
2
1. Fill a clean vial (24 mm Ø) with 10 ml of the water
sample , 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 and empty it,
leaving a few drops remaining in the vial .
5. Add one DPD No. 1 tablet straight from the foil and
crush the tablet using a clean stirring rod.
6. Add water sample to the 10 ml mark.
7. Close the vial tightly with the cap and swirl several times
until the tablet is dissolved.
8. Place the vial in the sample chamber making sure that
the marks are aligned.
9. Press TEST key.
The result is shown in the display
as Chlorine dioxide in mg/l Chlorine,
or
as Chlorine dioxide in mg/l ClO
2
.
Notes:
See page 51.
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
*,** mg/l ClO
2
*,** mg/l ClO
2
[Cl]
2 0 1