Application of the Hygrometer (900-901D1)
A-35
4/9/98
A. Instructions for Karl Fischer Analysis
To perform a Karl Fisher analysis, use the apparatus in Figure
A-3 and complete the following steps:
1.
Fill the glass bottle completely with the sample liquid.
2.
Close both valves and turn on the magnetic stirrer.
3.
Permit sufficient time for the entire test apparatus and the
sample liquid to reach equilibrium with the ambient
temperature.
4.
Turn on the hygrometer and monitor the dew point reading.
When a stable dew point reading indicates that equilibrium
has been reached, record the reading.
5.
Insert a syringe through the rubber septum and withdraw a
fluid sample for Karl Fischer analysis. Record the actual
moisture content of the sample.
6.
Open the exhaust valve.
7.
Open the inlet valve and increase the moisture content of the
sample by bubbling wet N
2
through the liquid (or decrease the
moisture content by bubbling dry N
2
through the liquid).
8.
When the hygrometer reading indicates the approximate
moisture content expected, close both valves.
9.
Repeat steps 3-8 until samples with several different moisture
contents have been analyzed.
Содержание PM880
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