Lovibond Maxi Direct - Colour, True and Apparent

68
MaxiDirect_2c 03/2010
1.1 Methods
Colour, true and apparent
(APHA Platinum-Cobalt
Standard Method)
0 – 500 Pt-Co units (mg/l Pt)
Sample preparation (Note 4):
Step A
Filter approx. 50 ml deionised water through a membrane
filter with a pore width of 0.45 μm.
Discard the filtrate. Filter another 50 ml deionised water
and keep it for zeroing.
Step B
Filter approx. 50 ml water sample using the same filter.
Keep this filtrate for sample measurement.
1. Fill a clean vial (24 mm Ø) with 10 ml of the filtrated
deionised water (from Step A), 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 completely.
5. Rinse the vial with the filtrated water sample and fill
with 10 ml filtrated water sample (from Step B).
6. Place the vial in the sample chamber making sure that
the
marks are aligned.
7. Press TEST key.
The result is shown in the display in Pt-Co units (mg/l Pt).
prepare Zero
press ZERO
Zero accepted
prepare Test
press TEST
2
0 4