An instrument employing the principle of flame emission spectrophotometry has been constructed to selectively monitor the mass concentration of Fe<sub>2</sub>O<sub>3</sub> aerosol in animal exposure chambers. The instrument was calibrated ever the range from 0.3 to 1.6 mg/m<sup>3</sup>, and the maximum sensitivity was found to be about 0.3 μg of Fe<sub>2</sub>O<sub>3</sub> aerosol per cubic meter of air.
Walter L. Crider, Arthur A. Strong, and Naomi P. Barkley, "Flame Emission Instrument for Selectively Monitoring Fe2O3 Aerosol in Animal Exposure Chambers," Appl. Spectrosc. 22, 542-544 (1968)