Abstract
To noninvasively determine the distribution of inhaled air pollutants in the intact human respiratory tract, a gas analyzer with a fast dynamic performance, small sampling flow, and high sensitivity is required. Such an analyzer was developed for chlorine (Cl2) by utilizing a commercially available transducer consisting of a thermionic catalytic source and a metallic collector. Operation of the transducer at 600–800 °C, an absolute pressure of 120 Torr, and a sampling flow rate of 0.6 ℓ/min resulted in a sensitivity of 3–5 pA/ppm Cl2, a minimum detection limit of 0.04 ppm, a response time of less than 100 ms, and signal-to-noise ratios of approximately 10 and 40 at Cl2 mole fractions of 0.1 and 1.0 ppm, respectively. The calibration was linear in the range of 0.3 to 4.0 ppm Cl2 and insensitive to variations in temperature, CO2 content, and humidity which exist in respired air during a breathing cycle.
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