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空气污染对档案的破坏是一个缓慢的、累积的变化过程,我们对不同年代纸质档案做过酸度测试,也证明了这一点。空气污染是指空气中含有的各种有害气体超标。其主要有三类:一是酸性气体,如二氧化硫、硫化氢、氯气;二是氧化性气体,如一氧化氮、二氧化氮、臭氧;三是粉尘类物质。本文仅以二氧化硫和二氧化氮为例,说明有害气体对档案纸张的破坏作用。
The destruction of archives by air pollution is a slow and cumulative process of change. We also test the acidity of paper archives of different ages. Air pollution refers to the air contains a variety of harmful gases exceeded. There are mainly three categories: one is acid gas, such as sulfur dioxide, hydrogen sulfide, chlorine; the second is oxidizing gases, such as nitrogen monoxide, nitrogen dioxide, ozone; the third is dust substances. In this paper, only sulfur dioxide and nitrogen dioxide, for example, illustrate the damaging effects of harmful gases on the paper archives.