부산대학교 도서관

Potassium is commonly used as a tracer for biomass burning and the mixing state of potassium particles needs to be well described in order to reduce uncertainties in detection sensitivity. In this study, Scanning Transmission X-ray Microscopy (STXM) was used to visualize potassium-containing particles sampled from a residential wood stove and from ambient air in the urban environment. Fresh emissions from the biomass burning source show distinct potassium-containing particles attached to the surface of soot particles, whereas potassium in aged ambient air particles had time to interact with other components and exists in completely different chemical states with large variability in physical properties. [ABSTRACT FROM AUTHOR]