庐山酸性降水的化学特征及致酸因子研究

发布时间：2018-09-08 14:22

【摘要】：为了解庐山降水的化学特征和酸化趋势,于2011年夏季及2012年春季在庐山进行降水采集,对降水的p H、主要阴阳离子和有机酸进行分析。结果表明,酸性降水出现频率为100%,p H均值为4.44。降水中SO_4~(2-)、NH_4~+、NO_3~-和Ca~(2+)占总离子的70.1%,降水酸度主要贡献为H_2SO457%、HNO_325%及有机酸19%。降水的相对酸度较高,在2011年夏季和2012年春季分别为0.47和0.32。而SO_4~(2-)/NO_3~-则分别为2.28和2.63。相对于1993年春季,庐山降水酸度趋于降低,SO_4~(2-)、Ca~(2+)浓度水平下降明显,而NH_4~+、NO_3~-略有升高,HNO_3对酸度的贡献增加,降水已由硫酸型污染转成混合型污染。相对于国内其他背景站点,庐山降水酸度较高,但总离子浓度水平较低,因此庐山作为研究中国东南酸雨区的背景站点具有一定的科学意义。
[Abstract]:In order to understand the chemical characteristics and acidification trend of precipitation in Lushan Mountain, precipitation was collected in the summer of 2011 and spring of 2012. The pH, main anions and organic acids of precipitation were analyzed. The results show that the occurrence frequency of acid precipitation is 100 and the mean value of H is 4.44. In precipitation, SO_4~ (2-) NH4- and Ca~ (2) account for 70.1 of the total ions. The main contribution of precipitation acidity is to H2SO457 and HNO325% and organic acid 19. The relative acidity of precipitation was relatively high, which was 0.47 and 0.32 in the summer of 2011 and the spring of 2012, respectively. SO_4~ (2-) / NO3- was 2. 28 and 2. 63, respectively. Compared with the spring of 1993, the acidity of Lushan precipitation tends to decrease, and the concentration level of Ca2 decreases obviously, while the contribution of HNO3 to acidity increases slightly by NH_4~. The precipitation has changed from sulfuric acid pollution to mixed pollution. Compared with other background sites in China, Lushan has higher acidity but lower total ion concentration. Therefore, Lushan is of scientific significance as a background site for the study of southeastern acid rain in China.
【作者单位】：济南市环境监测中心站;山东大学环境研究院;山东大学环境科学与工程学院;山东省环境保护科学研究设计院;
【基金】：国家自然科学基金(41475115)
【分类号】：X517

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