宜昌降雨中元素和有机物含量分布及其影响

Distribution of Element and Organic Matter of Rainfall and Its Influence in Yichang

在宜昌国控酸雨监测点位采用智能降水监测仪收集2016年5月-2017年4月的自然降雨和人工增雨,采用吹扫捕集/气相色谱质谱法检测挥发性有机物含量,石墨板消解/电感耦合等离子体质谱法检测元素含量;使用SPSS等软件制图分析元素和挥发性有机物含量的变化趋势、自然降雨与人工增雨中待测物含量的不同及城区与郊区降雨中待测物含量的差异,探讨元素和挥发性有机物对地表水的污染状况。结果表明:宜昌降雨中待测物含量最大的时段是秋冬季,不同待测物在城区和郊区降雨中的分布不一致,人工增雨中待测物含量与自然降雨差异较小,所有降雨中待测物均未对地表水造成污染。

Natural rainfall and artificial precipitation samples were collected with intelligent precipitation monitoring equipment at the state-controlled acid rain monitoring sites in Yichang during the period May 2016 to April 2017.In the samples,volatile organic compounds were determined by purge and trap GS-MS,and elements were measured with graphite-plate digestion and inductively coupled plasma-mass spectrometry.Furthermore,software like SPSS and others were used to analyze the changing trend of content of elements and volatile organic compounds,and the differences of the analytes(elements and organic matters)content between the samples of natural rainfall and artificial precipitation,as well as differences of the analytes content of the rainfall samples collected in urban area and suburbs.The potential pollution effects of the elements and organic matters contained in rainfall on surface waters were discussed.It was concluded that autumn and winter in Yichang are the period during which the rainfall had highest content of the analytes;the analytes content differed somewhat in rainfalls of the urban and suburban,while differed slightly between natural rainfall and artificial precipitation;in addition,it seemed the analytes in the rainfall has not incurred pollution to the surface waters.