昆明市2017-2021年降水中水溶性离子的变化趋势与分析  

Variation Trend and Analysis of Water-soluble Ions in Precipitation from 2017 to 2021 in Kunming

作　　者：张俊华 黄丽娟 张瑩 王东秀 周圆 ZHANG Jun-hua;HUANG Li-juan;ZHANG Ying;WANG Dong-xiu;ZhouYuan(The Ecological and Environmental Monitoring Station of DEEY in Kunming,Kunming Yunnan 650228,China)

机构地区：[1]云南省生态环境厅驻昆明市生态环境监测站,云南昆明650228

出　　处：《环境科学导刊》2023年第6期45-47,共3页Environmental Science Survey

摘　　要：为了解昆明市降水中水溶性离子变化趋势,采用主城区5个监测点2017—2021年间降水的pH值和9种水溶性离子(SO_(4)2-、NO_(3)^(-)、Cl^(-)、F^(-)、K+、Na^(+)、Ca^(2+)、Mg^(2+)、NH4+)的监测数据进行分析。结果表明:2017—2021年期间,昆明市降水pH值均呈碱性,未监测到酸雨;SO_(4)2-、NH_(4)^(+)和F-浓度呈下降趋势,Cl^(-)、NO_(3)^(-)、K^(+)、Na^(+)、Ca^(2+)、Mg^(2+)离子浓度均呈上升趋势。NO_(3)-/SO_(4)2-(N/S)比值上升,从0.33上升至0.58,表明昆明市降水中的酸性污染物从硫酸型转向硫酸/硝酸混合型。盘龙区、官渡区和五华区的降水特征最相近。The pH value of precipitation and monitoring data of nine water^(-)soluble ions(SO_(4)2^(-)、NO_(3)^(-)、Cl^(-)、F^(-)、K+、Na+、Ca^(2+)、Mg^(2+)、NH4+)from five monitoring stations in the major metropolitan area were analyzed from 2017 to 2021 to better understand the trend of water^(-)soluble ions in Kunming precipitation.According to the data,the pH of precipitation in Kunming was alkaline during the time period,with no acid rain observed.SO_(4)2^(-),NH4+,and F^(-)concentrations decreased year after year.The concentrations of Cl^(-)、NO_(3)^(-)、K^(+)、Na^(+)、Ca^(+)、Mg^(2+)all showed an increasing trend.The NO_(3)^(-)/SO_(4)2^(-)(N/S)ratio increased from 0.33 to 0.58,indicating that acidic pollutants in precipitation in Kunming changed from sulfuric acid type to sulfuric acid/nitric acid type.The districts of Panlong,Guandu,and Wuhua have the most comparable precipitation characteristics.

关 键 词：降水 PH值 离子特征 变化趋势 昆明市 

分 类 号：X51[环境科学与工程—环境工程]