科研之友
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摘要
An in-situ analytical procedure employing silicon chip based ultra high field asymmetric waveform ion mobility spectrometry (FAIMS) via direct sniffing was developed for the determination of 10 listed hazardous chemicals which are prohibited for public transportation in China. The sample introduction temperature was set at 50 degrees C. The carrier gas flow rate and the sample flow rate were 1500 and 100 mL min(-1), respectively. Recognition algorithm was also developed for the FAIMS fingerprint spectral. Ten kinds of chemicals were resolved with high reproducibility at the concentration from 100 ppb to 20 ppm. In comparison with the current competing instruments, the microchip based FAIMS instrument, which features its simplicity, high sensitivity and selectivity, fast response and free of sample pretreatment, opens up new applications in the field of public security and homeland security.
