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Ion capture mobility spectroscopy for the detection of traces of acetic acid in mixed acids and various brands of edible vinegar
Recently, the photoionization-based negative ion trapping and migration spectrometry technology developed by the Institute of Spectrometry and Mass Spectrometry at the Medical Physics and Technology Center of the Chinese Academy of Sciences' Hefei Institute of Physical Sciences has enabled the detection of various organic acids. This work was published in the "Progress of the Royal Society of Chemistry" (RSC Advances, DOI: 10.1039/C4RA10763B). This technology not only adds a non-radioactive ion source for ion mobility spectrometry instruments, but also provides a successful case for the control of ion chemical reactions at atmospheric pressure.
Ion mobility spectrometry instruments are often used for on-site rapid detection of trace toxic hazards. The development of new non-radioactive ion sources is an important direction for migration spectrometry research. In the past, vacuum ultraviolet light was often used as an ionization source for ion mobility spectrometry. Under the action of ultraviolet light, the molecules of the analytes were converted into positive ions. According to the characteristics of the positive ion mobility spectrum, the molecules of the substances to be measured were detected and detected. . For a substance to be detected which has a smaller energy than the ultraviolet light energy or poor photoionization efficiency, this method is incapable of detecting positive ions formed by ultraviolet ionization.
To this end, researchers in the Institute of Spectroscopic/Mass Spectrometry have developed an ion trapping and migration spectrometry technique based on the study of the UV ionization electron trapping ion mobility spectroscopy PI-EA-IMS: the first step, UV photoionization generates electrons; the second step, electronics Capture generates reactive ions. In the third step, reactive ion capture converts the analyte molecules into negative ions. In the fourth step, resolution measurement of the analytes is achieved through the characteristics of the anion migration spectrum. Using newly developed chloride ion trapping ion mobility spectrometry technology, a variety of organic acids and five brands of vinegar in edible vinegar were successfully tested.
Prior to this, the Spectrum Mass Spectrometry Laboratory also invented the non-radioactive plasma source ion mobility spectrometry technology, developed a prototype ion mobility spectrometer detector, and passed the third-party organization's high and low temperature, high temperature and humidity, shock, electromagnetic interference, Software evaluation and performance test results show that: in the detection of species, sensitivity, analysis time, accuracy, etc., reached the international advanced level of similar products.
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