Surface acoustic wave gas chromatography is widely used in the detection of many substances such as explosives, water pollution, and toxic gases due to its small size, rapid detection, and responsiveness. It provides a convenient and efficient detection method for environmental protection and public safety. For a long time, this kind of instrument mainly relied on imports.
Recently, He Shitang, a researcher at the Institute of Acoustics of the Acoustics Research Institute of the Chinese Academy of Sciences, completed the development of surface acoustic wave gas chromatography and realized the localization of such instruments.
Surface acoustic wave gas chromatography is an organic gas analyzer based on the combination of surface acoustic wave (SAW) sensor and gas chromatography. After gas chromatography separates the organic mixture into pure components, it is quantitatively detected by a surface acoustic wave sensor. The sensitivity is high. The column has a fast heating rate (about 20 °C per second), small volume, etc. It can realize broad-spectrum trace gas (volatile and semi-volatile organics), fast (within 5 minutes), high sensitivity (ppb ~ ppt level) site Analysis has broad application prospects in public safety, environmental monitoring, food and drug testing.
During the development of the instrument, He Shitang team theoretically analyzed the response mechanism of the SAW gas chromatograph and calculated the lower limit of the quality detection of the instrument. The core component of the instrument, the surface acoustic wave (SAW) detector, was analyzed and the SAW was analyzed. Sensitivity of different areas of the detector surface. Based on the analysis results, the docking parameters of the detector and the detector and the separation system are optimized. In addition, the He Shitang team is designing sample injection enrichment and chromatographic separation systems, surface acoustic wave detection systems, numerical control systems and auxiliary systems. On the basis of multiple subsystems, system integration and the development of surface acoustic wave gas chromatograph prototypes were achieved. The detection limit of the prototype was reduced to half that of similar foreign instruments, which was equivalent to double the performance.
In addition to the traditional analysis of explosives, drugs, human odors, and water pollution, the He Shitang team also developed a Chinese herbal ingredient detection function based on the use of musk as a sample. Related research is expected to provide technical support for quality supervision of Chinese medicine. In the research, the team will focus on the research of analytical methods to make the surface acoustic wave gas chromatograph more accurate, perform better performance, and combine with the application fields to develop field-targeted fast inspection instruments.
The relevant research results are published in Applied Acoustics.
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