Abstract
Abstract A simple, rapid and low-cost method for differentiating a wide range of concentrations of gaseous hydrogen sulfide (H 2 S) is described. A large dynamic range (50 ppb to 50 ppm) was successfully classified at ambient temperature using a colorimetric sensor array comprised of chemoresponsive dyes coupled to a commercially available 8-bit flatbed scanner. Principle component analysis of the composite magnitude and kinetics of color change for the array of dye spots over the entire dynamic range resulted in 100% classification. This was achieved by including chemoresponsive dyes which reacted specifically with H 2 S at different detection thresholds.
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