Acid gases are emitted from diverse industrial sources and are harmful to humans and the environment. Traditionally detection has involved specialized technologies that cannot comprehensively monitor emissions. Other pollutants, such as volatile organic compounds (VOCs), are either not quantified or multiple technologies must be invested in.
Traditionally Selected Ion Flow Tube Mass Spectrometry (SIFT-MS) has used positive reagent ions (H3O+, NO+, and O2+), which are more suitable for detecting VOCs than inorganic gases. Recent innovation has added four negatively charged reagent ions: O–, O2–, OH–, and NO2–. The additional ionization mechanisms provided by the new ions have enabled previously inaccessible gases – such as hydrogen chloride, hydrogen fluoride, and sulfur dioxide – to be analyzed. Instrument detection limits are in the part-per-trillion concentration range (by volume), which is ideal for ambient monitoring. Stack gas analysis is easily accommodated via inline sample dilution.
This advance means that SIFT-MS now provides a complete solution for stack and ambient monitoring scenarios involving acid gases and VOCs.