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.

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