As a result of a train derailment at Mississauga, Ontario, during November 1979, 90 tons of chlorine, 225 tons of styrene, 67 tons of toluol, 742 tons of propane, 366 tons of caustic soda, and 135 tons of toluene were spilled. Citizens in the immediate vicinity of the derailment were evacuated, and a program to measure the concentrations of chlorine and other compounds in the air was initiated. The operation of two mobile mass spectrometer systems to perform the air monitoring tasks is discussed. Both systems were in nearly constant operation for eight days. (4 graphs, 1 map, 3 references, 1 table)
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Lane et al. (1981) studied this question.