1. Scope
This test method describes a procedure for the determination of ammonia in hydrogen and other fuel cell feed gases. It has been successfully applied to other types of gaseous samples including air, engine exhaust, and landfill samples. An ion selective electrode (ISE) is used to measure the total ammonium content. Sensitivity from low part per billion (ppb, g/m3) up to part per million (ppm, mg/m3) concentration are achievable dependant on the amount of hydrogen or other fuel cell gas sampled. This test method can be applied to other gaseous samples requiring analysis of trace constituents provided an assessment of potential interferences has been accomplished.
Low operating temperature fuel cells such as proton exchange membrane fuel cells (PEFCs) require high purity hydrogen for maximum material performance and lifetime. Analysis to part-per-billion (ppb) concentration of individual contaminants such as ammonia in hydrogen and related fuel cell supply gases is necessary for assuring a feed gas of sufficient purity to satisfy fuel cell system needs.
Keywords
ammonia; sampling; hydrogen; fuel cells; gaseous fuels; ion selective electrode, ; impinger
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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