Publications by authors named "Qianni Zhou"
Black carbon (BC) plays an important role in air quality and climate change, which is closely associated with its mixing state and chemical compositions. In this work the mixing state of BC-containing single particles was investigated to explore the evolution process of ambient BC particles using a single particle aerosol mass spectrometer (SPAMS) in March 2018 in Zhengzhou, China. The BC-containing particles accounted for 61.
View Article and Find Full Text PDFRecently, internal mixing states of oxalate with metals in single particles have been reported from field studies, yet the role of metals in the formation processes of oxalate remains unclear due to the diversity of chemical components and complex atmospheric environment. In this study, the mixing states of oxalate with five metals, including zinc (Zn), copper (Cu), lead (Pb), vanadium (V) and iron (Fe) were investigated in Guangzhou, China. It was found that 55% of oxalate-containing particles were internally mixed with these metals.
View Article and Find Full Text PDFArticle Synopsis
- - The study used 21 air quality monitoring stations, including advanced single particle aerosol mass spectrometers, to assess the impact of fireworks on air quality during the 2020 Spring Festival in Guangzhou from January 21 to 28.
- - Findings revealed that fireworks significantly worsened air quality in both the discharge and prohibited areas, particularly on New Year's Eve, with sharp increases in particulate matter (PM) and sulfur oxides (SO) detected.
- - The research established a method to trace fireworks emissions with a focus on aluminum and identified main particle types emitted, such as levoglucan and potassium-rich particles, which were mixed with nitrates but not ideal for ammonium formation.