. A continuous stirred tank reactor (CSTR) system for exposing plants to gaseous air contaminants : principles, specifications, construction, and operation. Air, Pollution, United States; Plants, Effect of air pollution on; Plants, Effect of gases on. epresentative of the concentration in any »ortion of the chamber proper. CSTR DESIGN AND CONSTRUCTION The CSTR system is in use in our greenhouse nd controlled-environment [Phytotron (Downs nd Bonaminio 1976)] faciHties for exposing (lants to known concentrations of individual or lultiple pollutants. The system employs a pol- utant (gas) dispensi
. A continuous stirred tank reactor (CSTR) system for exposing plants to gaseous air contaminants : principles, specifications, construction, and operation. Air, Pollution, United States; Plants, Effect of air pollution on; Plants, Effect of gases on. epresentative of the concentration in any »ortion of the chamber proper. CSTR DESIGN AND CONSTRUCTION The CSTR system is in use in our greenhouse nd controlled-environment [Phytotron (Downs nd Bonaminio 1976)] faciHties for exposing (lants to known concentrations of individual or lultiple pollutants. The system employs a pol- utant (gas) dispensing unit for control of the est chemical(s), CSTR exposure chambers, and . shared-time gas-monitoring unit. Components or the greenhouse and Phytotron systems are lelailed in the appendix (tables A-1, A-2, A-3). 'OLLUTANT (Gas) Dispensing Unit The dispensing unit (figs. 1 and 2 for the 'hytotron) has three components: (1) a source if gas or pollutant [high-pressure tank(s), an izone generator, or liquid chemicals], (2) pre- ision rotameters, and (3) an air-dilution com- )onent (air manifold). Teflon tubing (TFE) is ised throughout this unit ( by ).). Sulfur dioxide and most other gases are avail- ible in cylinders at low concentrations in an inert larrier (usually Nj). Desirable tank concentra- ions may be computed from the system flow ate, the exposure-concentration ranges, and the otameter ranges. The source gas is taken hrough a two-stage regulator, followed by a low- )ressure "pancake" regulator, into an aluminum 'gas) manifold where it is maintained at 5 lb/in", rhe test gas can be diluted with charcoal- iltered air (shown for ozone but not for other fases in fig. 2) before it reaches the dispensing otameters. Ozone is produced by passing dry 0^ ( per- cent tank O ) across a constant electric-discharge mit (ozone generator). The O^-O - mixture flows nto an aluminum manifold where it can be di- uted with charcoal-filtered air from th
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