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酸雾、酸雨带来的危害近年来受到全世界的关注。SO_2和NOx的氧化产物是影响酸雾、酸雨pH值的主要因素,其中以硫酸最为重要。酸雨对生物的毒性作用可能与[SO_4~(2-)]、[NO_3~-]和[H~+]有关。由污染源排放的最主要硫氧化物是SO_2。在洁净干燥的大气中,SO_2氧化成SO_3是缓慢的,故SO_3的量很少,但在高湿度、低气温,又有颗粒物存在时可发生催化反应生成硫酸雾或硫酸盐。在太阳紫外光照射下,并有NOx存在时可发生光化学反应生成SO_3和硫酸雾。大气中的H_2S在有颗粒物存在下,可迅速氧化成SO_2。流行病学调查和研究表明,硫氧化物损害
Acid fog, the harm caused by acid rain in recent years by the world’s attention. Oxidation products of SO2 and NOx are the main factors that affect the pH value of acid mist and acid rain, of which sulfuric acid is the most important factor. The toxic effects of acid rain on organisms may be related to [SO_4 ~ (2 -)], [NO_3 ~ -] and [H ~ +]. The most important sulfur oxide emitted by sources is SO 2. In a clean and dry atmosphere, SO 2 is slowly oxidized to SO 3, so the amount of SO 3 is very small. However, when high humidity, low temperature and particulate matter are present, catalytic reaction can occur to generate sulfuric acid mist or sulfate. In the sun ultraviolet light, and the presence of NOx photochemical reactions occur can produce SO_3 and sulfuric acid mist. H 2 S in the atmosphere in the presence of particulate matter, can be rapidly oxidized to SO_2. Epidemiological investigations and studies have shown that sulfur oxides damage