2. ENVIRONMENTAL ChEMISTRy & TEChNOLOGy 2.1. Lectures

Chem. Listy, 102, s265–s1311 (2008) Environmental Chemistry & Technology
tolerable ness of protection means. The fatal overheating of
human body can happen at the temperatures over 40 °C.
The charts of all permeation curves are shown on Fig. 5.
The permeation of HD agent through polymer membrane is
faster with increasing temperature and permeation will be
sharper course.
Fig. 5. The comparison of permeation curves obtained at different
temperatures
The related values of breakthrough times evaluated with
using time lag method are presented in Table II.
Table II
The values of HD breakthrough time obtained with using the
time-lag method for measurement under various temperatures
by IMS detector
Temperature Breakthorough time of HD
minutes hours
15 °C 1485 22 : 20
20 °C 600 12 : 00
25 °C 440 7 : 20
30 °C 285 4 : 45
35 °C 150 2 : 30
40 °C 90 1 : 30
The dependence of HD breakthrough time on temperature
is plotted in chart shown on Fig. 6. The points in the
chart were interlaced by exponential curve and this curve was
expressed by regression equation. The exponential equation
can be used for breakthrough time on temperature depen-
Fig. 6. The chart of hD breakthrough time dependence on the
temperature
s295
dence quantification and the parameters could be used for
different materials resistance comparison.
Conclusions
The main purpose of this measurement was to compare
the analytical methods and/or detection techniques used for
the breakthrough time’s evaluation. On the basis of obtained
results comparison it is possible to submit that the value of
HD breakthrough time is strongly dependent on sensitivity of
used analytical method. The IMS detector enables to perform
the continual measurement of permeation HD in real time.
The result is permeation curve represented by increase of permeating
vapors amount in time. The GC method providing
an exact determination of kind and amount of permeating
compound and products of interaction between tested polymer
and permeating toxic agent, i.e. qualitative a quantitative
analysis in contrast to IMS. However, the GC method does
not enable to perform the continual measurement and is not
so suitable for long term measurement. Otherwise, the IMS
method indicates course of permeation vapor through polymer
membrane but is not able to determine kind and amount
of permeated compound.
But simultaneous use of both detection methods used
simultaneously enable to perform the more exact definition
of tested polymer barrier material character.
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