2011年春季华南师范大学石牌校区冷凝水的化学成分特征及其来源  

Chemical composition and sources of artificial-harvesting dew water at Shipai campus, South China Normal University, Guangzhou during the spring of 2011

作　　者：沈慧[1] 温小浩[1] 李保生[1,2] 周厚云[1] 郑佳丽[1] 郑琰明[3] 郭静怡[1] 李嘉欣[1] 

机构地区：[1]华南师范大学地理科学学院,广州510631 [2]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710075 [3]中山大学地理科学与规划学院,广州510275

出　　处：《环境科学学报》2013年第5期1367-1375,共9页Acta Scientiae Circumstantiae

基　　金：中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金(No.SKLLQG1013);教育部高等学校博士点专项新老师类基金(No.20094407120004);广东省高等学校人才引进项目~~

摘　　要：为深入研究广州城区的大气环境质量,于2011年春季在华南师范大学石牌校区采用人工冷凝方法采集了33个冷凝水样品,对其进行pH和阴阳离子分析,以探讨这些冷凝水的化学成分特征.结果表明,石牌校区绝大多数冷凝水样品的pH值分布范围为5.65～7.11(个别样品pH值为5.06),平均值为6.45,显示其已不属于酸雨,这在一定程度上反映出过去10多年特别是广州为迎接2010年亚运会在城市大气环境污染治理方面取得了较好的成效.冷凝水的阴阳离子总浓度(TDS)介于195.96～1267.76μeq·L-1之间,平均为395.46μeq·L-1;各离子浓度高低依次为Ca2+、SO2-4、NH+4、Cl-、Na+、NO-3、Mg2+、K+、NO-2、F-.石牌校区冷凝水的这种离子浓度分布特征指示,其清洁程度差于香港、广东鹤山、云南丽江、青海瓦里关山等地的大气降水,而优于同期采集的石牌校区大气降水;其污染来源除部分属自然源外,还主要与建筑活动、工业生产、汽车尾气等人类活动等有密切关系.During the spring of 2011, 33 samples of ＂artificial-harvesting dew water＂, which was the dew artificially condensed from vapour, were collected at Shipai campus of South China Normal University in Guangzhou. The measurement of pH values and ion concentrations of the samples showed that 1 apart from one sample of 5.06, most of the samples had high pH values ranging from 5.65 to 7.11, with an average of 6.45. This indicated that the rain was not acidic and the improvement of air quality was significant.2 The ion concentrations （μeq·L-1） of the samples in a decreasing order were Ca^2＋, SO4^2-, NH4^＋, Cl^-, Na^＋, NO3^-, Mg^2＋, K^＋, NO2^-, and F^-. The range of total ion concentrations （TDS） was from 195.96 to 1267.76 μeq·L-1 with an average of 395.46 μeq·L-1. The characteristics of such pH values and ion concentrations indicated that the artificial-harvesting dew water was suffered from mild-moderate contamination with the cleaning degree worse than Hong Kong, Heshan of Guangdong, Lijiang of Yunnan and Waliguan Mountain of Qinghaibut better than the atmospheric precipitation samples collected at Shipai campus at the same time. The pollution sources were mainly anthropogenic, such as the airborne dust from building construction, combustion of coal and oil, etc.

关 键 词：广州 阴阳离子 人工冷凝水 化学成分 污染来源 

分 类 号：X511[环境科学与工程—环境工程]