Combined positive matrix factorization (PMF) and nitrogen isotope signature analysis to provide insights into the source contribution to aerosol free amino acids

Revealing the Chemical Profiles of Airborne Particulate Matter Sources in Lake Baikal Area: A Combination of Three Techniques

“…However, the results obtained using those techniques also need to be validated. A much smaller number of studies have been devoted to the comparison of PMF-derived source contributions with those obtained by solving mass-balance equations using the isotopic composition of the study object and the isotopic signatures of emission sources as input data [20][21][22]. The small number of such studies is conditioned by the availability of data on the chemical composition of source emissions.…”

Proteinaceous Matter in PM2.5 in Suburban Guiyang, Southwestern China: Decreased Importance in Long‐Range Transport and Atmospheric Degradation

“…The wide concentration ranges and varied AA compositions of aerosol PrM in different areas could be affected by multiple factors, including source proportions, air mass transport distances, atmospheric oxidative capacity, and meteorological conditions (Abe et al., 2015; X. Li et al., 2022; Wen et al., 2022; Zhu et al., 2021a). However, the concentrations of total CAAs were generally reported to be three to five times higher than those of total FAAs, such as the observations in Jeju Island (Yang et al., 2004), Davids (Zhang & Anastasio, 2003), North Carolina (Samy et al., 2013), and Rome (Di Filippo et al., 2014).…”

“…However, because the δ 15 N value ranges of Pro in PM 2.5 were closer to those of Pro in plants, plants may be the most important contributor to Pro. The existing researches on δ 15 N values of aerosol AAs mainly focus on Gly (Wen et al., 2022; Zhu et al., 2020b, 2021a). In this study, Gly is a relatively small AA species.…”

“…Correlation analysis between PrM and indicative ions (e.g., K + , NH 4 + , Ca 2+ , Mg 2+ , and SO 4 2‒ ) in PM 2.5 was widely applied to identify the sources of PrM (Song et al., 2017; Wen et al., 2022). K + is a commonly used tracer of biomass burning (Cheng et al., 2013; Liang et al., 2020).…”

“…Thus, the overall results implied that local sources, particularly primary biological aerosol particles, may be crucial contributors of aerosol PrM in this study. Correlation analysis between PrM and indicative ions (e.g., K + , NH 4 + , Ca 2+ , Mg 2+ , and SO 4 2-) in PM 2.5 was widely applied to identify the sources of PrM (Song et al, 2017;Wen et al, 2022). K + is a commonly used tracer of biomass burning (Cheng et al, 2013;Liang et al, 2020).…”