| 广州地区雨水化学组成与雨水酸度主控因子研究 |
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| 中文关键词 酸雨 离子组成 可溶性有机碳 大气污染 碱中和 |
| 英文关键词 acid rain ionic composition DOC atmospheric pollution neutralization |
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| 中文摘要 |
| 采集了广州地区2003-10～2004-9的雨水样品, 通过对雨水样品的pH值、主要阴、阳离子组成和可溶性有机碳（DOC）的测定, 分析了广州地区酸雨的现状以及影响雨水酸度的主要因素等. 结果表明，在观测期间, 广州地区酸雨频率高达85%; 雨水的主要离子组成为NH4+、SO42-、NO3-、Ca2+、Cl-和Na+, 而DOC约占总化学组成的24.0％; 雨水酸度的主要控制离子还是SO42-, 但NO3-对雨水酸度的影响越来越大, 同时, 水溶性有机酸对雨水酸度的贡献也很明显; 另外, 来自扬尘中高浓度的碱性含钙化合物也对雨水酸度的有明显的中和作用. |
| 英文摘要 |
| All rainwater samples were collected during the period Oct.2003 to Sep.2004 and analysed in terms of pH values, major cation, anion composition and soluble organic carbon (DOC). The measurement of pH values shows that 85% of these rain events were acid rain. The ionic composition analysis indicates that NO2-, SO42-, NH4+ and Ca2+ are dominant ions in the rainwater. DOC approximately consisted of 24.0% of total chemical components. Although SO42- remains the dominant acidic ion in term of concentration, NO3- has become very important to the acidity of rainwater and as well as the organic acids. Furthermore, dust sourced Ca2+ appears to play significant role in neutralizing the acidity in rainwater. |
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