First gaseous sulfuric acid measurements in automobile exhaust: Implications for volatile nanoparticle formation
First gaseous sulfuric acid measurements in automobile exhaust: Implications for volatile nanoparticle formation
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DOI：
10.1016/j.atmosenv.2006.06.038
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发表时间：
2006-12
影响因子：
5
通讯作者：
F. Arnold;L. Pirjola;H. Aufmhoff;T. Schuck;T. Lähde;K. Hämeri
中科院分区：
文献类型：
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作者：
F. Arnold;L. Pirjola;H. Aufmhoff;T. Schuck;T. Lähde;K. Hämeri
气态硫酸（GSA）被认为是一种重要的，如果不是最重要的成核气体存在于现代柴油汽车尾气。它触发了新的气溶胶粒子的形成，这些粒子通过冷凝和凝结而生长。在这里，我们报告的第一次测量GSA在汽车尾气。实验是使用现代乘用车柴油车配备了排气后处理系统组成的氧化催化剂和柴油颗粒过滤器。所使用的柴油具有超低硫质量分数，仅为5×10−6。测量的GSA数浓度达到1× 109 cm −3。还测量了直径大于3 nm的新成核颗粒。浓度可达1× 105 cm − 3，当GSA超过阈值（5×107-2× 108 cm −3）时，浓度与GSA呈正相关。这表明GSA参与了新的挥发性颗粒的形成。
Gaseous sulfuric acid (GSA) is thought to represent an important if not the most important nucleating gas present in modern diesel automobile exhaust. It triggers the formation of new aerosol particles, which grow by condensation and coagulation. Here we report on the first measurements of GSA in automobile exhaust. The experiment was made using a modern passenger diesel car equipped with an exhaust after-treatment system composed of an oxidation catalyst and a diesel-particle filter. The diesel fuel used had an ultra-low sulfur mass fraction of only 5×10−6. Measured GSA number concentrations reached up to 1×109cm−3. Freshly nucleated particles with diameters larger than 3nm were also measured. The concentrations reached up to 1×105cm−3and were positively correlated with GSA for GSA exceeding a threshold value in the range of 5×107–2×108cm−3. This suggests that GSA was involved in the formation of new volatile particles.