烟台市大气湿沉降中水溶性离子污染特征及来源研究  

Pollution characteristics and sources of water-soluble ions in atmospheric wet deposition in Yantai

作　　者：张谦栋 曲红拥 李家宁 ZHANG Qian-dong;QU Hong-yong;LI Jia-ning(Shandong Provincial Yantai Eco-environment Monitoring Center,Yantai 264000,China)

机构地区：[1]山东省烟台生态环境监测中心,山东烟台264000

出　　处：《环境生态学》2022年第8期85-90,共6页Environmental Ecology

基　　金：国家自然科学基金(41601549、41701604);山东省优秀青年科学基金项目(Zr2020yq31)资助。

摘　　要：为研究湿沉降中水溶性离子的污染特征,于2021年在烟台市设4个点位开展湿沉降采样工作。本次研究分析了2021年全年的湿沉降pH水平,并利用离子色谱法分析了F^(-)、Cl^(-)、NO^(-)_(3)、SO^(2-)_(4)、Na^(+)、NH^(+)4、K^(+)、Mg^(2+)、Ca^(2+)共9种水溶性离子的浓度水平。结果显示,2021年烟台市大气湿沉降中,pH均高于5.6,属于非酸雨,电导率主要由水溶性离子提供,水溶性离子F^(-)、Cl^(-)、SO^(2-)_(4)、NO^(-)_(3)、Na^(+)、K^(+)、Mg^(2+)、Ca^(2+)、NH^(+)4平均当量浓度为(3.3±6.5)(135.2±238.3)(71.0±57.7)(38.5±43.7)(99.3±213.5)(5.1±10.5)(28.0±56.0)(64.3±110.3)(69.6±60.9)μeq/L,与“十三五”期间的组分特征有较大变化。通过计算NO^(-)_(3)和SO^(2-)_(4)的当量浓度比值显示固定源对湿沉降中水溶性离子污染贡献更大。主成分分析显示,湿沉降中水溶性离子主要来自于海洋、气态前体物的二次转化和生物质燃烧。In order to study the pollution characteristics of water-soluble ions in wet deposition,four points were set up to carry out wet deposition sampling in Yantai in 2021.In this study,the pH level of wet deposition in 2021 was analyzed,and F^(-),Cl^(-),NO^(-)_(3),SO^(2-)_(4),Na^(+),NH^(+)4,K^(+),Mg^(2+),Ca^(2+)were analyzed by ion chromatography.The results showed that in the atmospheric wet deposition of Yantai in 2021,the pH was higher than 5.6,which belonged to non-acid rain,the electrical conductivity was mainly provided by water-soluble ions,the average equivalent concentrations of F^(-),Cl^(-),SO^(2-)_(4),NO^(-)_(3),Na^(+),K^(+),Mg^(2+),Ca^(2+),NH^(+)4 were(3.3±6.5),(135.2±238.3),(71.0±57.7),(38.5±43.7),(99.3±213.5),(5.1±10.5),(28.0±56.0),(64.3±110.3),(69.6±60.9)μeq/L,which were significantly different from the composition characteristics during the 13th Five-Year Plan period.The calculation of the equivalent concentration ratio of NO^(-)_(3) and SO^(2-)_(4) showed that the fixed source contributed more to the pollution of water-soluble ions in wet deposition.Principal component analysis showed that the water-soluble ions in wet deposition mainly came from the ocean,the secondary conversion of gaseous precursors and biomass combustion.

关 键 词：湿沉降 水溶性离子 污染特征 来源 

分 类 号：X51[环境科学与工程—环境工程]