ORBECO SP600, Instruction Manual, Page: 168 / 334

166 SP600 Spectrophotometer 01/2008
1.1 Methods
Molybdate / Molybdenum
with Tablet
1 – 30 mg/l MoO
4
/ 0.6 – 18 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 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
2 5 0