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首页> 外文期刊>Applied optics >Resonance-enhanced multiphoton ionization for real-time monitoring of trichloroethylene formed by degradation of tetrachloroethylene using zero-valent zinc
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Resonance-enhanced multiphoton ionization for real-time monitoring of trichloroethylene formed by degradation of tetrachloroethylene using zero-valent zinc

机译：共振增强多光子电离，用于实时监测由零价锌降解四氯乙烯形成的三氯乙烯

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摘要

Resonance-enhanced multiphoton ionization (REMPI) is investigated as a potential technique for real-time monitoring of selected volatile organochloride compounds (VOCs). In a proof-of-concept experiment, the progress of the reductive-degradation of tetrachloroethylene (PCE) to trichloroethylene (TCE) by zero-valent zinc was monitored by REMPI measurements performed in the headspace above the PCE solution. Two-photon resonant REMPI spectra of TCE and PCE were recorded over the wavelength range 305-320 nm. The concentrations of PCE and TCE in the headspace were monitored by measurement of the ionization signal with 315.64- and 310.48-nm excitation for PCE and TCE, respectively. Calibration curves yielded a linear range of more than 2 orders of magnitude for both compounds. The REMPI headspace results agreed well with the solution-phase results from gas chromatography analysis, which was used for independent verification of the progress of the reaction.
机译：共振增强多光子电离（REMPI）被研究为实时监测选定的挥发性有机氯化物（VOC）的潜在技术。在概念验证实验中，通过在PCE溶液上方的顶部空间进行的REMPI测量，监测了零价锌将四氯乙烯（PCE）还原降解为三氯乙烯（TCE）的过程。在波长305-320 nm范围内记录了TCE和PCE的双光子共振REMPI光谱。通过分别用315.64-和310.48-nm激发PCE和TCE的电离信号来测量顶空中PCE和TCE的浓度。两种化合物的校正曲线的线性范围均超过2个数量级。 REMPI顶空结果与气相色谱分析的溶液相结果非常吻合，后者用于独立验证反应进程。

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