NH 4+, NO 3−, and SO 42− in roadside and rural size-resolved particles and transformation of NO 2/SO 2 to nanoparticle-bound NO 3−/SO 42−

Abstract

This study investigates ammonium, nitrate, and sulfate (NH 4 +, NO 3 −, and SO 4 2−) in size-resolved particles (particularly nano (PM 0.01–0.056)/ultrafine (PM 0.01–0.1)) and NO x/SO 2 collected near a busy road and at a rural site. The average (mass) cumulative fraction of secondary inorganic aerosols (SO 4 2−+NO 3 −+NH 4 +) in nano or ultrafine particles at the roadside was found to be three to four times that at the rural site. The above three secondary inorganic aerosol species were present in similar cumulative fractions in particles of size 1–18 μm at both sites; however, dissimilar fractions were observed for Cl −, Na +, and K +. The nitrogen ratios (NRs: NR = NO 3 −−N/(NO 3 −−N + NO 2–N)), sulfur ratios (SRs: SR = SO 4 2−−S/(SO 4 2−−S + SO 2–S)), dNR/D P (derivative of NR with respect to D P (particle diameter)), and dSR/D P (derivative of SR with respect to D P) at the roadside were higher than those at the rural site for nano/ultrafine particles. At both sites (particularly the roadside), the nanoparticles had significantly higher dNR/D P and dSR/D P values than differently sized particles, implying that NO 3 −/SO 4 2− (from NO 2/SO 2 transformation or NO 3 −/SO 4 2− deposition) were present on these particles.