2011—2019年铜陵市酸雨状况变化趋势分析  

Analysis on Change Trend of Acid Rain in Tongling from 2011 to 2019

作　　者：程龙 董昊 洪星园 张红 CHENG Long;DONG Hao;HONG Xing-yuan;ZHANG Hong(Anhui Eco-Environment Monitoring Center,Hefei,Anhui 230071,China;Anhui Provincial Academy of Eco-Environmental Science Research,Hefei,Anhui 230061,China)

机构地区：[1]安徽省生态环境监测中心,安徽合肥230071 [2]安徽省生态环境科学研究院,安徽合肥230061

出　　处：《环境监测管理与技术》2022年第2期32-37,共6页The Administration and Technique of Environmental Monitoring

基　　金：安徽省自然科学基金资助项目(2108085MD138);国家重点研发计划基金资助项目(2018YFC0213800);安徽省博士后研究人员科研活动经费基金资助项目(2021B548,2020A395);安徽省自然科学青年基金资助项目(2108085QD161)。

摘　　要：通过统计分析2011—2019年铜陵市酸雨监测结果,研究该市酸雨变化趋势及其成因。结果表明:铜陵市降水pH年均值为5.04~6.38,酸雨污染状况虽在改善,但酸雨仍时有发生;铜陵市降水中SO_(4)^(2-)与NO_(3)^(-)的浓度比总体呈现下降趋势,从2011年的4.05下降到2019年的1.25,表明NO_(3)^(-)对降水酸度的影响逐渐增加,酸雨类型正由硫酸型向硫酸硝酸混合型转变,机动车排放对于酸雨的贡献已不可忽视;2019年SO_(4)^(2-)沉降通量较2016年下降68.4%,NO_(3)^(-)沉降通量较2016年下降5.1%,大气中SO_(2)质量浓度变化趋势与SO_(4)^(2-)沉降通量变化趋势十分吻合;铜陵市降水中起主要中和作用的离子为NH_(4)^(+)和Ca^(2+),其中NH_(4)^(+)强于Ca^(2+)。The change trend and causes of acid rain in Tongling were studied by statistical analysis of the monitoring data from 2011 to 2019.The results showed that the annual average pH value of precipitation in Tongling was 5.04~6.38.Although acid rain pollution was improving in Tongling,it still occurred occasionally.The concentrations ratio of SO_(4)^(2-)/NO_(3)^(-) showed a downward trend,from 4.05 in 2011 to 1.25 in 2019,indicating that the influence of NO_(3)^(-) on precipitation acidity was gradually increasing,the type of acid rain was changing from sulfuric acid type to sulfuric acid-nitric acid mixed type.The contribution of vehicle emissions to acid rain could not be ignored.Compared with 2016,the deposition flux of SO_(4)^(2-) and NO_(3)^(-) decreased by 68.4%and 5.1%in 2019,respectively.The variation trend of SO_(2) mass concentration was very consistent with SO_(4)^(2-) deposition flux in atmosphere.NH_(4)^(+) and Ca^(2+) played a major role in neutralization,in which NH_(4)^(+) was stronger than Ca^(2+).

关 键 词：PH值 酸雨频率 变化趋势 离子浓度 铜陵市 

分 类 号：X517[环境科学与工程—环境工程]