光电离-互相关离子迁移谱测定二氧六环的研究
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摘要
为提高光电离-离子迁移谱装置的灵敏度和分辨率,本文采用10.6 eV Kr灯为电离源,将光电离与互相关离子迁移谱相结合,以二氧六环为检测对象,对迁移管电压、离子门开门时间、迁移气流速、迁移管温度等参数进行了优化。优化的光电离-离子迁移谱参数为:离子门线性方波调频频率为0～5 kHz,迁移管电压10 kV,迁移管温度373.15 K,载气流速800 mL/min。在优化的实验条件下,测得二氧六环的分辨率最高为96,其检出限为0.025 ng/mL。与传统的信号处理方式相比而言,互相关离子迁移谱测得的分辨率、灵敏度均较优。
To improve the sensitivity and resolution of photoionization ion mobility spectrometer(UV-IMS) for volatile organic compounds(VOCs),the 10.6 eV Kr lamp was used as ionization source to combine ultraviolet ionization with correlation ion mobility spectrometry(CIMS).The parameters of drift tube voltage, pulse width of ion gate, drift gas velocity and drift tube temperature were optimized by using 1,4-dioxane.The optimal parameters including drift tube voltage,ion gate linear square wave frequency modulation range, drift gas velocity and drift tube temperature were 10 kV, 0-10 kHz, 800 mL/min,and 373.15 K,respectively.The resolution of the 1,4-dioxane was 96 and the detection limit was 0.25 ng/mL under the optimized experimental conditions.The resolution and sensitivity of the correlation ion mobility spectrometry method were significantly improved compared to the traditional signal processing method.
To improve the sensitivity and resolution of photoionization ion mobility spectrometer(UV-IMS) for volatile organic compounds(VOCs),the 10.6 eV Kr lamp was used as ionization source to combine ultraviolet ionization with correlation ion mobility spectrometry(CIMS).The parameters of drift tube voltage, pulse width of ion gate, drift gas velocity and drift tube temperature were optimized by using 1,4-dioxane.The optimal parameters including drift tube voltage,ion gate linear square wave frequency modulation range, drift gas velocity and drift tube temperature were 10 kV, 0-10 kHz, 800 mL/min,and 373.15 K,respectively.The resolution of the 1,4-dioxane was 96 and the detection limit was 0.25 ng/mL under the optimized experimental conditions.The resolution and sensitivity of the correlation ion mobility spectrometry method were significantly improved compared to the traditional signal processing method.
引文
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