open access

https://doi.org/10.14943/lowtemsci.84.29

https://hdl.handle.net/2115/99015

Freezing-accelerated reactions and specific reactions in ice

日本語

Reaction Mechanism

2026-03-10

低温科学研究所

Low Temperature Science

84

29-38

In ice and snow, chemical reactions are generally thought to slow down due to temperature drop and restriction of molecular movement. However, there are many reports that reactions are accelerated by freezing. In this paper, we summarized the factors and examples and clarified the characteristics of chemical reactions under freezing. In addition, we summarized the main factors of reaction acceleration and classified the reactions. These include freeze concentration due to ice crystal growth, pH changes due to freeze concentration, freezing potential generated between ice and solution, catalysis on ice surface, and change of reaction path. It was also shown that photochemical reactions occur efficiently in snow and ice due to multiple scattering of light, and photolysis of nitric acid in snow and ice is a source of nitrogen oxides in the atmosphere. From these results, it was suggested that ice and snow are not merely fields for reaction inhibition but also function as important reaction fields in environmental chemistry.

紀要論文

Version of Record

1880-7593