Abstract

Ammonia (NH₃) is the most abundant alkaline gas in the atmosphere and the cause of the majority of secondary particles in particulate matter PM2.5. The method of ultraviolet spectrum analysis is generally adopted in traditional ammonia concentration detection with a deuterium or xenon lamp, and its cost is relatively high. In this paper, white light-emitting diodes of a lower cost are used as an alternative light source. Then experimental research on ammonia concentration detection is carried out, and the results are compared with those using white light-emitting diodes, deuterium, and xenon lamps. The results show that, under the same experimental conditions, using white light-emitting diodes to measure the ammonia concentration can achieve the same accuracy as using deuterium or xenon lamps. This conclusion provides a solution for light source selection for ammonia concentration detection with low cost and guaranteed accuracy.

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