A continuous monitor-sulfur chemiluminescence detector (CM-SCD) system forthe measurement of total gaseous sulfur species in air

A continuous monitor-sulfur chemiluminescence detector (CM-SCD) system with a flameless, temperature-controlled furnace combustion source was develope d for real-time measurement of total sulfur gases in air. This measurement system demonstrated a linear dynamic range exceeding five orders of magnitu de and equimolar sensitivity to the most prevalent atmospheric sulfur gases . A detection limit of 10 pptv was obtained using 10 min signal averages. O n a real-time basis, detection in the 20-50 pptv range was demonstrated. Af ter modification of its sample inlet system, the CM-SCD showed no appreciab le interference effects from the addition of H2O vapor, NO2 or O-3 to the s ample matrix. In the recent Gas-Phase Sulfur Intercomparison Experiment (GA SIE), the CM-SCD compared favorably with SO, measurement methods. (C) 1999 Elsevier Science Ltd. All rights reserved.