Investigating the cross-interference effects of alumina refinery process gas species on a SAW based mercury vapor sensor

摘要: In this study, the effect of some common alumina refinery process gas species on response a surface acoustic wave (SAW) based elemental mercury (Hg0) vapor microsensor was investigated. The developed sensor SAW delay line, fabricated ST-cut quartz substrate with nickel (Ni) interdigitated transducer (IDT) electrodes and gold (Au) film sensitive layer. Ni chosen as IDT material due to its immiscibility in thus allowing operate for longer time, required by industries. exposed concentrations between 24 365 ppbv without/with presence ammonia, acetaldehyde, ethyl mercaptan, dimethyl disulphide, methyl ketone humidity. detection limit toward Hg0 calculated be 1.4 4.0 at operating temperatures 35 75 °C, respectively. coefficient variance magnitude found within ± 1.86 5.73% °C when repeated pulses without interfering species, This indicates high precision while measuring low vapor. Results showed that any one along vapor, deviated up- 7% (93% selectivity) an temperature °C. Furthermore, selectivity 87% tested mixture all gases. There insignificant cross-sensitivity humidity content increased range 15,300 30,600 ppmv (equivalent 50 100% relative room temperature). overall results indicate is able detect selectively even simulated industrial conditions can potentially cheaper more reliable alternative current monitoring methods used refineries.