ProMinent DULCOTEST PAA 1-mA-200 ppm, Руководство по эксплуатации, Страница: 47 / 100

47
Pr o Minent ®
16 Compliance with guidelines and
standards
Declaration of compliance The measuring cells for peracetic acid PAA have been developed
and tested in compliance with current European guidelines and
standards. Production is subject to a high quality standard, which
is ensured by means of European standards and guidelines.
A corresponding declaration of compliance can be obtained from
ProMinent.
Appendix
Titration procedure
Titration to determine the concentration of H
2
O
2
and peracetic acid
is done in 2 stages.
1. Titration stage (H
2
O
2
)
Equipment required Sample water 20 ml
Permanganate solution (e.g. 0.1 N)
Sulphuric acid (25 %)
Manganese sulphate solution (1 %)
Place approx 10 ml sulphuric acid (25 %) in 20 ml of sample
water.
Then titrate with permanganate solution (e.g. 0.1 N)
NOTE
After the first addition of permanganate solution, it may take
several seconds for the sample to discolour. You can accelerate
this change in reaction by adding 5 drops of manganese
sulphate solution (1 %).
Continue to add permanganate solution until the sample
stays pale pink in colour.
IMPORTANT
It is essential that you avoid large excesses of permanganate
(which turns the sample purple)!
In the second stage of titration the permanganate would be
taken as being peracetic acid and thus would distort the result!
Note the consumption A of permanganate solution (in ml).
Compliance with guidelines and standards / Appendix
BA_DT_097_10_08_4spr.p65 09.10.2008, 13:19 Uhr 47