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首页> 外文期刊>Environmental Pollution >Chemical Composition And Seasonal Variation Of Acid Deposition In Guangzhou, South China: Comparison With Precipitation In Other Major Chinese Cities
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Chemical Composition And Seasonal Variation Of Acid Deposition In Guangzhou, South China: Comparison With Precipitation In Other Major Chinese Cities

机译：中国南方广州的化学成分和酸沉降的季节性变化：与中国其他主要城市的降水比较

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摘要

With the aim of understanding the origin of acid rains in South China, we analyzed rainwaters collected from Guangzhou, China, between March 2005 and February 2006. The pH of rainwater collected during the monitoring period varied from 4.22 to 5.87; acid rain represented about 94% of total precipitation during this period. The rainwater was characterized by high concentrations of SO_4~(2-), NO_3~-, Ca~(2+), and NH_4~+. SO_4~(2-) and NO_3~-, the main precursors of acid rain, were related to the combustion of coal and fertilizer use/ traffic emissions, respectively. Ca~(2+) and NHJ act as neutralizes of acid, accounting for the decoupling between high SO_4~(2-) concentrations and relatively high pH in the Guangzhou precipitation. The acid rain in Guangzhou is most pronounced during spring and summer. A comparison with acid precipitation in other Chinese cities reveals a decreasing neutralization capacity from north to south, probably related to the role and origin of alkaline bases in precipitation.
机译：为了了解华南地区酸雨的起源，我们分析了2005年3月至2006年2月从中国广州收集的雨水。监测期间收集的雨水的pH值从4.22到5.87不等。在此期间，酸雨约占总降水量的94％。雨水的特征是高浓度的SO_4〜（2-），NO_3〜-，Ca〜（2+）和NH_4〜+。酸雨的主要前体SO_4〜（2-）和NO_3〜-分别与煤炭燃烧和化肥使用/交通排放有关。 Ca〜（2+）和NHJ起到酸的中和作用，这解释了广州降水中高SO_4〜（2-）浓度与较高pH值之间的去耦关系。在春季和夏季，广州的酸雨最为明显。与中国其他城市的酸沉降相比，中和能力从北向南递减，这可能与降水中碱性碱的作用和来源有关。

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