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您的检索式：作者名="Matthew S. Landis"
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| 1 | Chemical characterization and sources of PM2.5 at 12-h resolution in Guiyang, China显示文摘The increasing emission of primary and gaseous precursors of secondarily formed atmospheric particulate matter due to continuing industrial development and urbanization are leading to an increased public awareness of environmental issues and human health risks in China.As part of a pilot study, 12-h integrated fine fraction particulate matter(PM_(2.5) filter samples were collected to chemically characterize and investigate the sources of ambient particulate matter in Guiyang City, Guizhou Province, southwestern China. Results showed that the 12-h integrated PM_(2.5) concentrations exhibited a daytime average of 51 ± 22 lg m^(-3)(mean ± standard deviation) with a range of 17–128 lg m^(-3) and a nighttime average of55 ± 32 lg m~(^(-3)) with a range of 4–186 lg m^(-3). The 24-h integrated PM_(2.5) concentrations varied from 15 to157 lg m~(^(-3)), with a mean value of 53 ± 25 lg m^(-3), which exceeded the 24-h PM_(2.5) standard of 35 lg m^(-3) set by USEPA, but was below the standard of 75 lg m^(-3), set by China Ministry of Environmental Protection. Energy-dispersive X-ray fluorescence spectrometry(XRF) was applied to determine PM_(2.5) chemical element concentrations. The order of concentrations of heavy metals in PM_(2.5) were iron(Fe) [ zinc(Zn) [ manganese(Mn) [ lead(Pb) [ arsenic(As) [ chromium(Cr). The total concentration of 18 chemical elements was 13 ± 2 lg m^(-3),accounting for 25% in PM_(2.5), which is comparable to other major cities in China, but much higher than cities outside of China. | Longchao Liang Na Liu Matthew S. Landis Xiaohang Xu Xinbin Feng Zhuo Chen Lihai Shang Guangle Qiu | 2018 | Acta Geochimica2018，37，2： | 4 |
| 2 | Chemical characterization of volatile organic compounds near the World Trade Center: Ambient concentrations and source apportionment显示文摘 | David A. Olson Gary A. Norris Robert L. Seila Matthew S. Landis Alan F. Vette | 2007 | Atmospheric Environment2007，，27： | 1 |
| 3 | Chemical characterization of volatile organic compounds near the World Trade Center: Ambient concentrations and source apportionment显示文摘 | David A. Olson Gary A. Norris Robert L. Seila Matthew S. Landis Alan F. Vette | 2007 | Atmospheric Environment2007，，27： | 1 |
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