【摘要】 为了解佛山市禅城区大气降水化学特征,该研究于2018年1～12月采集禅城区大气降水样品,测定降雨量、pH值、电导率和SO42-、NO3-、NO2-、F-、Cl-、Ca2+、Mg2+、K+、Na+和NH4+等阴阳离子。结果表明,2018年佛山市禅城区降雨量为2 058.6 mm,主要集中在5～9月份;pH值在3.95～6.47之间,年均值为5.35,pH值春、夏季较低,秋、冬季较高,酸雨频率为46.0%;电导率在3.51～100.40μS/cm之间,年均值为22.48μS/cm;降水离子浓度所占比例大小顺序为:NO3->SO42->Cl->NH4+>Ca2+>NO2->K+>Na+>Mg2+>F-,其中NO3-和SO42-是降水中主要的阴离子,NH4+和Ca2+是主要的阳离子,这4种离子占总离子的76.0%;除个别离子外,春季和冬季各离子浓度较秋季高,而夏季最低,阴阳离子之间存在着显著或极显著正相关关系。更多还原

【Abstract】 In order to analyze the chemical characteristics of the atmospheric precipitation of Chancheng District in Foshan,the parameters of rainfall, pH, electrical conductivity and concentrations of anions and cations, such as SO42-, NO3-, NO2-, F-, Cl-,Ca2+, Mg2+, K+, Na+, NH4+, were measured with the samples collected from January to December 2018. The results indicated that the rainfall in 2018 was 2 058.6 mm, mainly concentrated from May to September. The pH value ranged from 3.95 to 6.47, with an average annual value of 5.35. The pH value was lower in spring and summer than that in autumn and winter, and the frequency of acid rain was 46.0%. The range of electrical conductivity was from 3.51 to 100.40 μS/cm, and the average annual value was 22.48μS/cm. The order of the concentration of precipitation ions was as following, NO3->SO42->Cl->NH4+>Ca2+>NO2->K+>Na+>Mg2+>F-.NO3-and SO42-were the main anions in the precipitation, NH4+ and Ca2+ were the main cations. And these four ions accounted for76.0% of the total ions. Except for a few ions, the concentration of ions in spring and winter was higher than that in autumn, and the lowest concentration occurred in summer. Moreover, there was a significant positive correlation between anions and cations.更多还原