Camlab Lovibond MD 610, Instruction Manual

Page: 239 / 371

233
MD 610_2d 11/2019
Total Phosphate LR
with Liquid reagent
0.1 – 10 mg/l PO
4
This test will measure all phosphorous containing com-
pounds present in the sample, including ortho-Phosphate,
Polyphosphate and organic phosphorous compounds.
1. Fill a clean100-ml-Erlenmeyer flask with 50 ml homo-
genized sample.
2. Add one spoon KP962(Ammonium Persulfate Pow-
der) to the prepared water sample
3. Add 15 drops of KS278 (50% SulphuricAcid) to the
same water sample.
4. Boil for 20 minutes , maintaining the sample volume
above 25 ml with deionised water.
5. Swirl gently severaltimesto mix the contentsand allow
the Erlenmeyerflask to cool to room temperature.
6. Fill the Erlenmeyer flask with drops of the same size by
holding the bottle vertically and squeezeslowly:
2 dropsKS135 (Phenolphthalein Substitute Indicator)
7. Add drops of KS144 (Calcium Hardness Buffer) , one
drop at a time with mixing , until a pale pink colour
just appears.
8. Fill the sample up to 50ml with deionised water.
9. Proceedasin point 3 of the method before (page230).
The result is shown in the display in mg/l total-Phos-
phate.
3 4 3