HETEROGENEOUS CHEMISTRY OF HBR AND HF

被引:70
作者
HANSON, DR [1 ]
RAVISHANKARA, AR [1 ]
机构
[1] UNIV COLORADO,COOPERAT INST RES ENVIRONM SCI,BOULDER,CO 80309
关键词
D O I
10.1021/j100202a069
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The heterogeneous chemistry of HBr and HF was studied on glass and ice surfaces at 200 K. Physical and reactive uptake were investigated using a cylindrical fast-flow reactor in conjunction with a chemical-ionization mass spectrometer. HF exhibited no measurable uptake on ice or NAT nor did it significantly react with ClONO2 or HOCl. It is inferred that HF would be unreactive on polar stratospheric cloud particle surfaces. Physical adsorption or absorption of HBr was observed onto glass, adsorbed H2O layers on glass, and ice. For the relatively high [HBr] used, a very large uptake by ice was observed, and we detected no saturation of the surface. HBr reacts efficiently with ClONO2, Cl2, and N2O5, especially on ice and nitric acid ice surfaces. BrCl was observed as the primary product for the reaction HBr + ClONO2. The products HCl and Br2 were observed for the reaction of HBr with Cl2. On the basis of these results, it is likely that HBr would be processed efficiently on ice particles.
引用
收藏
页码:9441 / 9446
页数:6
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