Trends in glow-discharge sampling

In the recently developed atmospheric electrolyte-as-cathode GD sources, a liquid serves as the cathode for the discharge, which facilitates direct analysis of continuously flowing liquids [302]. The device is potentially applicable to the continuous analysis for metals in water and wastewater. 

One other potential analytical use of GDs is as tunable plasma sources. Tunable sources can be operated in two modes to detect either atoms or molecules of (mainly) organic 

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