A system is described for multiple sampling of toxic vapours in the field, in which a simple bubbler with critical-orifice control of flow rates is used. An investigation of the factors affecting absorption efficiency is reported. The particular application of the scheme to the field assessment of "nerve gases" is discussed, the analytical method being adapted to permit processing of the samples in the bubbler.Although the system was developed for studies on the "nerve gases," it has since been successfully applied to field measurements of chlorine, phosgene, cyanogen chloride and mustard gas and it could no doubt be used for many other volatile toxic materials.
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