Department of Atmospheric Sciences and Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA.
Environ Sci Technol. 2010 Apr 1;44(7):2461-5. doi: 10.1021/es9036868.
The heterogeneous interaction of alkylamines with sulfuric acid has been investigated to assess the role of amines in aerosol growth through the formation of alkylaminium sulfates. The kinetic experiments were conducted in a low-pressure fast flow reactor coupled to an ion drift-chemical ionization mass spectrometer (ID-CIMS). The measurements of heterogeneous uptake of methylamine, dimethylamine, and trimethylamine were performed in the acidity range of 59-82 wt % H(2)SO(4) and between 243 and 283 K. Irreversible reactive uptakes were observed for all three alkylamines, with comparable uptake coefficients (gamma) in the range of 2.0 x 10(-2) to 4.4 x 10(-2). The measured gamma value was slightly higher in more concentrated sulfuric acid and at lower temperatures. The results imply that the heterogeneous reactions of alkylamines contribute effectively to the growth of atmospheric acidic particles and, hence, secondary organic aerosol formation.
已研究了烷基胺与硫酸的非均相相互作用，以通过形成烷基铵硫酸盐来评估胺在气溶胶生长中的作用。在与离子漂移-化学电离质谱仪（ID-CIMS）耦合的低压快速流动反应器中进行了动力学实验。在 59-82wt%H2SO4和 243-283K 的酸度范围内，进行了甲胺、二甲胺和三甲胺的非均相吸收测量。所有三种烷基胺都观察到了不可逆的反应性吸收，吸收系数（γ）在 2.0×10-2到 4.4×10-2之间。在更浓的硫酸中和较低的温度下，测量的γ值略高。结果表明，烷基胺的非均相反应有效地促进了大气酸性颗粒的生长，从而促进了二次有机气溶胶的形成。
