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Particle emission from traffic, power plants or, increasingly, stoves andfireplaces poses a serious risk for human health. The harmfulness of theparticles depends not only on their size and shape but also on adsorbates. Particledetectors for size and concentration are available on the market; however,determining content and adsorbents is still a challenge.  In this work, a measurement setup for the characterization of dust and ashparticle content with regard to their adsorbates is presented. For the proof ofconcept, ammonia-contaminated fly ash samples from a coal-fired power plantequipped with a selective non-catalytic reduction (SNCR) system were used.The fly ash sample was placed on top of a heater substrate situated in atest chamber and heated up to several hundred degrees. A silicon carbide field-effect transistor (SiC-FET) gas sensorwas used to detect desorbing species by transporting the headspace above theheater to the gas sensor with a small gas flow. Accumulation of desorbingspecies in the heater chamber followed by transfer to the gas sensor is alsopossible.  A mass spectrometer was placed downstream of the sensor as a reference.A clear correlation between the SiC-FET response and the ammonia spectra ofthe mass spectrometer was observed. In addition, different levels of contamination can bedistinguished. Thus, with the presented setup, chemical characterization of particles,especially of adsorbates which contribute significantly to the harmfulness of the particles, ispossible

Characterization of ash particles with a microheater and gas-sensitive SiC field-effect transistors