Digestion Polyphosphate HR with liquid reagents
Fill a suitable digestion
vessel with 50 ml
homogenised sample.
Invert the vial and allow to
cool to room temperature.
50 ml
Fill the sample with
deionised water to 50 ml .
EN Method Reference Book 1.0
Add 15 drops
KS278 (50% sulfuric
acid).
Add 2 drops
KS135 (Phenolphthalein
Substitute Indikator).
Phosphate HR L / M335
15
12
11
10
9
8
7
6
Boil the sample for
20 minutes . A sample
volume of about 25 ml
should be retained;
If necessary, fill with
deionised water.
2
Add KS 144 (Calcium
Hardness Buffer) drop by
drop to the same sample
until colouration turns from
light pink to red. (Note:
make sure to swirl the
vial after adding each
drop!)
20 min
1
2
3
4
5
EN
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