Abstract:

A homemade electrothermal vaporizationassisted pulsed corona discharge atmospheric pressure ionization source was developed for cou
pling 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.

Key words: pulsed corona discharge, electrothermal vaporization; detection of heavy metal, atmospheric pressure ionization, online mass spectrometry detection