and chlorine gas was released into the work area from the
pipeline, instead of traveling up to the scrubber tower
where it is supposed to be neutralized. The leakage volume
was approximately 1 L by liquefied volume. When
the 1 L was evaporated, the airborne volume was estimated
approximately 400 L. The ambient chlorine gas
measurement was done by industrial hygienist team of a
university hospital. The local governmental agency for
labor and employment had requested the measurement.
The research team measured the chlorine concentration
of the ambient air at the leakage site and in the adjacent
areas 2 h after the accident. Three spots, each at a distance
of approximately 100 m from the accident site, were
chosen for measurement. Air specimens were collected
for 6 hours by the area sampling using a low-volume flow
sampler and quantitatively analyzed using ion chromatography
[10].