Nitrogen Isotopic Ratios of Gaseous Ammonia and Ammonium Aerosols in the Atmosphere

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  • 大気中アンモニアガスおよびアンモニウムエアロゾルの窒素同位体比
  • タイキ チュウ アンモニアガス オヨビ アンモニウムエアロゾル ノ チッソ ドウイタイヒ

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Abstract

Nitrogen isotope ratios (δ15N) in gaseous ammonia (NH3) and ammonium ion (NH4+) in aerosols as well as atmospheric concentrations of these species were measured. Samples were collected at Maki National Acid Deposition Monitoring Station that locates west of the Niigata Plane and near the shoreline of the Sea of Japan in Niigata Prefecture. The atmospheric concentrations of NH3 and NH4+ ranged, from 47.4 to 164 with a mean of 96.9 nmol m-3 and from 4.6 to 61.6 with a mean of 21.3 nmol m-3, respectively. The atmospheric concentration of NH3 at Maki Station is almost average value in Japan, while NH4+ concentration is lower than NH3. The δ15N in NH3 and in NH4+ ranged, from-14.5 to -1.0 with a mean-/8.3% and from 12.2 to 39.6 with a mean 22.1%, respectively. Thus, there was a large difference in δ15N in NH3 and in NH4+. Considering the changes of δ15N in NH4+ in the experiment on dry deposition of NH3 to a H2SO4-impregnated filter by Heaton (1997), there may be sufficient equilibrium reactions between NH3 and NH4+ aerosol in the atmosphere when atmospheric concentration of NH3 exceeds that of NH4+, and the isotopic composition of NH4+ became enriched in 15N, giving rise to the value of δ15N by the equilibrium isotopic fractionation effect between gas and aerosol.

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