Tintometer Lovibond MD100 Instrucciones página 54

Methods
GB
PO4
0.0.0
! Zero
Test
PO4
RESULT
54
Phosphate HR with Liquid Reagent
5 – 80 mg/l PO
4
This test is suitable for determining ortho-Phosphate in boiler
waters and potable water supplies. Samples should be filtered prior
to analysis to remove any suspended insoluble phosphate. A GF/C
filter is suitable.
Unscrew the two halves of the filter holder and place one GF/C filter
circle onto the base section. Screw the two parts together again, en-
suring the O ring is correctly located.
Fill a clean 20 ml syringe with approx. 14 ml water sample.
Connect the syringe to the filtration assembly and discharge the syringe
to waste, down to the 10 ml mark.
Fill a clean vial (24 mm Ø) with 10 ml of water sample from the
prepared syringe.
Perform zero calibration (see "Operation").
Fill the vial with drops of the same size by holding the bottle vertically
and squeeze slowly:
25 drops KS228 (Ammonium Molybdate)
Close the vial tightly with the cap and invert several times to mix the
contents.
Fill the vial with drops of the same size by holding the bottle vertically
and squeeze slowly:
25 drops of KS229 (Ammonium Metavanadate)
Close the vial tightly with the cap and invert several times to mix the
contents.
Wait for a reaction period of 10 minutes.
(Countdown can be activated, see page 43)
The method symbol flashes for approx. 3 seconds.
The result is shown in the display in mg/l Phosphate.
MD100_2 10/2014