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(a) Calibration curve of the modified IPA bio-sniffer and comparison with the previous one. The dynamic range of the modified bio-sniffer goes from 0.5 up to 1940 ppb. With the previous sniffer, it was 1.0 to 9060 ppb. The detection limit of the modified bio-sniffer was 0.5 ppb, which is better than the previous 1 ppb; (b) Typical responses of the modified bio sniffer to various concentrations of IPA gas.
