2000 年 10 巻 4 号 p. 867-871
A porous cellulose tape impregnated with a processing solution that includes N, N-Diethyl-p-phenylenediamine (DPD) sulfate, glycerin and methanol was developed for the detection of chlorine gas in air. When the sample is passed through the tape, chlorine reacts with DPD to form a red stain. The intensity of the red stain is proportional to the concentration of chlorine at a constant sampling time and flow rate, and was recorded by measuring the intensity of reflected light (555 nm) . The detection limit was 0.03 ppm of chlorine with a sampling time of 60 s and a flow rate of 200 ml min-1. The sensitivity of the tape could be maintained for at least 1 month when stored in dark clean box.
Reproducibility tests showed that the relative standard deviations of the response (n=10) was 2.5 % for 0.1ppm of chlorine gas. No interference was observed from ethanol (1 vol.%), acetone (1 vol.%), trichloroethylene (1 vol.%), carbon monoxide (100 ppm), hydrogen sulfide (30 ppm), sulfur dioxide (51 ppm) or ozone (2 ppm) .
The relative intensities of nitrogen dioxide and fluorine gas were 25 and 13 % of that of chlorine, respectively.
