Development and application of carbon and Pb isotopes analysis technology in fine particles
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The objective of this study is to investigate the compositions of carbon and lead isotopes in fine particulate matters (PM2.5) and, accordingly, to attribute potential sources of PM2.5 in Kaohsiung and Pingtung with the isotopic fingerprints. During the period from the spring (March) of 2019 to the summer (July) of 2019, ambient PM2.5 samples were collected from 8 sampling stations (Ciaotou, Zuoying, Fengshan, Siaogang, Daliao, Linyuan, Pingtung, and Chaozhou), respectively. In addition, this study also collected PM2.5 samples from 4 specific sources: a coal-fired power plant, an oil refinery plant, a steel plant, and Kaohsiung port in April and August, respectively. All the PM2.5 samples were characterized with the measurements of water-soluble ions, organic carbon, elemental carbon, crustal elements, heavy metals, and isotopic compositions of carbon (δ13C and 14C) and lead (206Pb, 207Pb, and 208Pb).
The results revealed that condensable particulate matter (CPM) was predominant in the PM2.5 emitted from three stationary pollution sources. Moreover, the level of organic CPM was higher than inorganic CPM in oil-refinery plant, whereas the levels of inorganic CPM were higher in both coal-fired power plant and steel plant. The chemical compositions from four pollution sources were: (1) coal-fired power plant: sulfate was important species (10%), predominant elementals included Na (due to the flue gas desulfurization with seawater), Mg, K, Ni, Zn, Mo, Cr, and Se, average 206Pb/207Pb and 208Pb/207Pb were 1.1959 (1.1781~1.2115) and 2.4305 (2.4108~2.4403); (2) oil-refinery plant: sulfate was important species (54%), predominant elementals included Fe, Mn, Ni, Zn, Mo, Pb, and Cr, average 206Pb/207Pb and 208Pb/207Pb were 1.1930 (1.1759~1.2106) and 2.4318 (2.4171~2.4437); (3) steel plant: sulfate was important species (35%), predominant elementals included Fe, Mg, K, Ca, Mn, Zn, Mo, Cd, Tl, Pb, Cr, Se, Rb, and Cs, average 206Pb/207Pb and 208Pb/207Pb were 1.1908 (1.1664~1.2143) and 2.4010 (2.3774~2.4229), the percentage of modern carbon was 18% (14~22%); (4) Kaohsiung port: the major compositions included sulfate, nitrate, ammonium, organic carbon, and elemental carbon, predominant elementals included Na, Zn, and V, δ13C ranged from -31.3 to -22.5‰, average 206Pb/207Pb and 208Pb/207Pb were 1.1561 (1.1406~1.1884) and 2.4295 (2.4013~2.4546), the average percentage of modern carbon was 34% (12~68%).
The average level of ambient PM2.5 from all sampling sites was 19.9 ± 10.2 μg/m3, which was lower than national
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Keyword |
Isotope, PM2.5,
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