Thermo Scientific AQUAfast AQ3700, User Manual

Page: 120 / 264

Thermo Scientific Orion AQUAfast AQ3700 Colorimeter User Guide
1.1 Methods
Molybdate
with Tablet
1 – 50 mg/l MoO
4
/ 0.6 – 30 mg/l Mo
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
the vial
.
5. Fill
20 ml of the water sample
in a 100 ml beaker.
6. Add one MOLYBDATE HR No. 1 tablet straight from
the foil to the water sample and crush the tablet using
a clean stirring rod.
7. Add
one MOLYBDATE HR No. 2 tablet
straight from
the foil to the same water sample and crush the tablet
using a clean stirring rod.
8. Dissolve the tablets using a clean stirring rod.
9. Rinse out the vial with the prepared water sample and
then fill to the 10 ml mark.
10. Close the vial tightly with the cap.
11. Place the vial in the sample chamber making sure that
the marks are aligned.
12. Press
TEST
key.
The result is shown in the display in mg/l Molybdate /
Molybdenum.
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
5 0 2