| The purity
of water for use in the pharmaceutical industry is mainly
controlled by its conductivity.
To comply with the European Pharmacopoeia, this measurement
must be made according to chapter 2.2.38.
All low conductivity measurements are influenced by the CO2
content of the air. The CO2 effect contributes significantly
to the overall uncertainty of the measurements. Measuring
in a closed system is therefore preferable and a slight flow
is advantageous.
The 26.6 µS/cm conductivity standard is prepared strictly
as described in the Pharmacopoeia and high quality glass bottles
are used for storage in order to avoid contamination.
Using the equipment and procedure described below ensures
full compliance with chapter 2.2.38 of the European Pharmacopoeia.
The control of "water for injections" (aqua ad iniectabilia)
and other pure waters is dealt with.
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