基于电热蒸发辅助脉冲电晕放电大气压离子化源的重金属污染在线质谱检测技术

On-Line Mass Spectrometry Detection of Heavy Metals by Electrothermal Vaporization-Assisted Pulsed Corona Discharge Ionization Source under Ambient Conditions

研制电热蒸发辅助脉冲电晕放电大气压离子化源,将其与飞行时间质谱耦合联用,建立了重金属污染的在线检测方法.实验结果表明,该方法对V,Cr,Mn,As等主要重金属污染物检测性能较好,灵敏度高,检出限一般可达10-13～10-12 g,具有结构简单、操作方便、能耗低等特点,实现了在线监测.

A home-made electrothermal vaporization-assisted pulsed corona discharge atmospheric pressure ionization source was developed for coupling with a time-of-flight mass spectrometer for on-line detection of heavy metals in water samples.Experimental results show that vanadium,chromium,manganese,arsenic,including arsenic,chromium,which are great harmful to the environment,could be detected.The source has a simple structure,convenient operation,low energy consumption,and is easy to use,with a high sensitivity.The limit of detection can get to 10-13—10-12 g,and the method can be used online.