TROPICAL GEOGRAPHY ›› 2016, Vol. 36 ›› Issue (4): 642-648.

### Chemical Composition and Sources of the Artificial-Harvesting Dew Water at the Shipai Campus, South China Normal University, during the Spring of 2013

WEN Xiaohao，JI Yixuan，WU Hang，WU Yijie，ZHOU Jiaming

1. （School of Geographical Science，South China Normal University，Guangzhou 510631，China）
• Received:2014-12-26 Online:2016-07-05 Published:2016-07-05

Abstract: During the spring of 2013, for investigating the atmospheric environment, 52 samples of “artificial-harvesting dew water”, which was the dew artificially condensed from vapour, were collected at the Shipai campus of South China Normal University in Guangzhou. The measurement of pH values and ion concentrations of the samples shows that: 1) most of the samples had pH values ranging from 5.00-6.47 with an average of 5.97, indicating they were not of severe acid rain status; 2) The ion concentrations (μeq/L) of the samples in a decreasing order was 2-4 SO > Ca2+> 3 NO? > Na+> Cl-> 2 NO? > Mg2+ ≈ K+> F-. The range of total ion concentrations (TDS) was from 57.87-484.38 μeq/L with an average of 154.53 μeq/L. The characteristics of such pH values and ion concentrations indicate that the degree of cleaning was equal to that of the samples of atmospheric precipitation collected in Heshan (Guangdong Province) and Waliguanshan (Qinghai Province), and was better than that of the samples of atmospheric precipitation collected at the Shipai campus of Guangzhou and at a campus of Shanghai in the spring of 2011, but it was worse than that of Lijiang (Yunnan Province). The pollution sources were mainly anthropogenic ones, such as the airborne dust of building, combustion of coal and oil, etc.