Preliminary assessment of chlorine reactivity with environmental materials accounting for boundary layer and maximum deposition effects

Many toxic industrial chemicals (TICs) such as chlorine and ammonia are very reactive with commonly encountered materials in the environment. The amount of TIC material reacted environment is an important factor determining impact a release. Typically characterized dry deposition rate atmospheric dispersion models, reaction has predominately been studied field scale experiments at concentration levels typical for air pollution (ppm levels). When considering removal by (dry) episodic release, gas phase concentrations will be much higher than those associated pollution, near-field local vegetation strongly influenced response leaves other elements surface “canopy” to high concentrations. In this work, standard engineering methods characterizing mass transfer from fluid conjunction that applied. Previous experimental programs under conditions relevant study show plant can reach limiting maximum so no longer react gaseous despite continued exposure. analysis presented here, it shown effect treated using same approach used model catalyst poisoning. This developed account boundary layer resistance framework could incorporated models. To test efficacy model, Controlled Environment Reactivity Test (CERT) apparatus was designed expose selected environmental (substrates including soil, rye grass, white clover, maple leaves, spruce branches) initial (nominally) 1000 ppm where measured function time determine modeling parameters. built control flow velocity chlorine/air mixture over substrates turbulence comparable atmosphere. Model parameters were found tested.