Hiroto Kawashima, Otoha Yoshida, Nana Suto. Long-Term Source Apportionment of Ammonium in PM<sub>2.5</sub> at a Suburban and a Rural Site Using Stable Nitrogen Isotopes. Environmental Science & Technology. 2023. 57. 3. 1268-1277
Nana Suto, Hiroto Kawashima. Measurement report: Source characteristics of water-soluble organic carbon in PM2.5 at two sites in Japan, as assessed by long-term observation and stable carbon isotope ratio. Atmospheric Chemistry and Physics. 2021. 21. 15. 11815-11828
Hiroto Kawashima, Otoha Yoshida, Nana Suto. Ion-exchange resin and denitrification pretreatment for determining δ15N-NH4+, δ15N-NO3-, and δ18O-NO3- values. Rapid Communications in Mass Spectrometry. 2021. 35. 6. e9027