摘要
为了解“十三五”期间昆明市官渡区大气降水化学组成特征,对2016年1月—2020年12月的188次降水中降水量、pH、电导率、K^(+)、Na^(+)、Ca^(2+)、Mg^(2+)、NH_(4)^(+)、F-、Cl^(-)、NO_(3)^(-)、SO_(4)^(2-)离子浓度采用秩相关系数、Pearson相关性分析和富集系数等方法进行分析,得出昆明市官渡区“十三五”期间降水无酸化情况,电导率呈下降趋势,表明大气环境污染程度减轻,环境空气质量有所提升。pH值和电导率呈冬季>春季>秋季>夏季的季节性规律。SO_(4)^(2-)/NO_(3)^(-)比值呈显著下降趋势,官渡区“十三五”期间降雨类型由硫酸型/燃煤型向混合型转变。通过富集系数分析得出K^(+)、Ca^(2+)、Mg^(2+)是明显的陆源性离子,Cl^(-)主要来源于海相和人为源贡献,SO_(4)^(2-)、NO_(3)^(-)主要来源于人类活动。
In order to examine the chemical composition characteristics of atmospheric precipitation in Guandu District of Kunming during the 13th Five-Year Plan period,pH,EC,K^(+),Na^(+),Ca^(2+),Mg^(2+),NH_(4)^(+),F-,Cl^(-),NO_(3)^(-),SO_(4)^(2-)concentrations in 188 precipitation from January 2016 to December 2020 were analyzed by rank correlation coefficient,Pearson correlation analysis and enrichment coefficient.It was concluded that there was no acidification in precipitation.The EC showed a decreasing trend,indicating that the pollution degree of atmospheric environment was reduced and the ambient air quality was improved.The pH and EC showed a seasonal regular of winter>spring>autumn>summer.The ratio of SO_(4)^(2-)/NO_(3)^(-)showed a significant downward trend,and the rainfall type turn from sulfuric acid type/coal to mixed type during the time period.The analysis of enrichment coefficient showed that K^(+),Ca^(2+)and Mg^(2+)were obvious land-borne ions,Cl^(-)mainly came from Marine and human contribution,SO_(4)^(2-)and NO_(3)^(-)mainly were from human activities.
作者
刘萍
LIU Ping(Guandu Branch Ecological and Environmental Monitoring Station,Kunming Ecological and Environmental Bureau,Kunming Yunnan 650200,China)
出处
《环境科学导刊》
2023年第2期76-82,共7页
Environmental Science Survey
关键词
大气降水
化学组成
富集系数
特征分析
昆明市
atmospheric precipitation
chemical composition
enrichment coefficient
analysis of characteristics
Kunming
