窒素同位体を用いた浮遊粒子状物質のアンモニウムイオン, 硝酸イオンの生成機構の解明と起源の推定

抄録

Particulate matter (PM) can have adverse effects on human health. The mechanisms of PM formation and behavior in the atmosphere are very complicated. To reduce PM concentrations effectively and attain environmental standards, source–receptor relationships must be clearly understood. Stable isotope ratios can be used to detect and distinguish primary materials, chemical processes, and sources. It has recently become possible to determine stable isotope ratios from small sample volumes with high accuracy and precision by using an isotope ratio mass spectrometer (IRMS) coupled with an elemental analyzer (EA).In environmental science, and especially in research on aerosols, stable isotope ratios are expected to constitute a powerful tool for source identification.This review paper introduces a possible formation mechanism and source apportionment of ammonium and nitrate ions in suspended particulate matter (SPM) using δ¹⁵N of ammonium (δ¹⁵N-NH₄⁺)， nitrate ions (δ¹⁵N-NO₃^-) of SPM and ammonia (δ¹⁵N-NH₃), nitrogen dioxide (δ¹⁵N-NO₂), and nitrate gas(δ¹⁵N-HNO₃).