期刊
ATMOSPHERIC ENVIRONMENT
卷 45, 期 35, 页码 6309-6316出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2011.08.057
关键词
Stable nitrogen isotope ratio; Suspended particulate matter; Nitrate; Ammonium ion
资金
- Nippon Life Insurance Foundation
- Tostem Foundation for Construction Materials Industry Promotion
- Japan Securities Scholarship Foundation
- Ministry of Education, Culture, Sports, Science and technology, Japan [23120704]
We studied the suspended particulate matter (SPM) collected in Akita Prefecture, Japan from April 2008 to January 2009 for inorganic ion composition and nitrogen isotopic ratio (delta N-15) of NH4+ and NO3-. The results showed an average SPM concentration of 15.6 mu g m(-3). The seasonal trend for SPM was higher values in the spring, lower in the winter. The major cations were Na+, NH4+, Ca2+ and major anions were SO42-, NO3-, Cl-. The annual correlation coefficient of ions indicates a very high value with NH4+ and SO42- (R = 0.93), NO3- and K+ (R = 0.65), NO3- and Ca2+ (R = 0.62). The high springtime values are the apparent result of the dust stream from Asia. Average delta N-15-NH4+ and delta N-15-NO3- were 16.1 parts per thousand and -0.69 parts per thousand, respectively. delta N-15-NH4+ increased slightly in summer, and delta N-15-NH4+ increased considerably in winter. The trends indicated conversely. The heavy delta N-15-NO3- in summer appears to be from agricultural sources such as animal waste and fertilizer. In addition, according to the difference in isotopes of NOx sources as the precursor of NO3-, the dominant origin of heavy delta N-15-NO3- in winter could be NOx emitted from fossil fuel combustion at low temperature. Moreover, the average delta N-15-NO3- seemed to be made to baseline (approximately 0%) by vehicle emissions at high temperature. These results are considered to be very reasonable. (C) 2011 Elsevier Ltd. All rights reserved.
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