XIAO De'an 1, 2, FU Chengcheng 2, GAO Lanlan 2, GONG Wei 2, ZHANG Zhimin 2

（1. College of Resources and Environmental Engineering, Guizhou Institute of Technology, Guiyang 550003, China;
2. Environmental Monitoring Center of Guizhou Province, Guiyang 550081, China）

Abstract： Atmospheric particulate (PM) is an important factor influencing air quality and human health. It is of great significance to understand its pollution level, sources of key components and variation characteristics. In the present study, atmospheric PM10 samples at two representative urban sites of Guiyang city during 14 to 20 February (Winter) and 1 to 7 July (Summer), 2014 were collected. Daily-based mass concentrations and sulfur isotope compositions of sulfate in PM10 samples were analyzed. The mass concentrations of atmospheric PM10 in February and July of Guiyang were 30-125 μg/m3 (mean 70±29 μg/m3) and 21-104 μg/m3 (mean 56±22 μg/m3), respectively, which were higher than the national level I standard (50 μg/m3). The δ34S values of sulfate in atmospheric PM10 in Guiyang were -3.98-4.99‰ (mean 0.28±2.32‰), and was generally higher in February than in July. The main source of sulfur in atmospheric PM10 of Guiyang was fossil fuel, except for coal, indicating that the coal-controlling measures have been effective in reducing SO2 emissions.

Key words：Guiyang; PM10; mass concentration; sulfur isotopes; characteristics

EARTH AND ENVIRONMENT Vol.51, No.3, Tot No.353, 2023, Page 348