Chemical characteristics of long-term acid rain and its impact on lake water chemistry:A case study in Southwest China

作     者：Liuyi Zhang JiaWang Shuxiao Wang Chunbo Wang Fumo Yang Tingzhen Li Liuyi Zhang;Jia Wang;Shuxiao Wang;Chunbo Wang;Fumo Yang;Tingzhen Li

作者机构：Chongqing Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges ReservoirChongqing Three Gorges UniversityWanzhou 404000China State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China College of Carbon Neutrality Future TechnologySichuan UniversityChengdu 610065China National Engineering Research Center on Flue Gas DesulfurizationChengdu 610065China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2024年第138卷第4期

页      面：121-131页

核心收录：

学科分类：07[理学] 08[工学] 070602[理学-大气物理学与大气环境] 0815[工学-水利工程] 0706[理学-大气科学] 

基　　金：supported by the Chongqing Science and Technology Commission Project(No.CSTB2022NSCQ-MSX0818) 

主　　题：Acid rain Chemical composition Neutralization Nitrogen deposition Water acidification 

摘      要：The chemical composition of acid rain and its impact on lake water chemistry in Chongqing,China,from 2000 to 2020 were studied in this *** regional acid rain intensity is affected jointly by the acid gas emissions and the neutralization of alkaline *** pH of precipitation experienced three stages of fluctuating decline,continuous improvement,and a slight *** pH showed inflection points in 2010,mainly due to the total control actions of SO_(2)and NO_(x)implemented in *** total ion concentrations in rural areas and urban areas were 489.08μeq/L and 618.57μeq/L,*** top four ions were SO_(4)^(2-),Ca^(2+),NH_(4)^(+)and NO_(3)^(-),which accounted for more than 90%of the total ion concentration,indicating the anthropogenic *** 2010,SO_(4)^(2-)fluctuated greatly while NO_(3)^(-)continued to rise;however,after 2010,both SO_(4)^(2-)and NO_(3)^(-)began to decline rapidly,with the rates of-12.03μeq/(L·year)and-4.11μeq/(L·year).Because the decline rate of SO_(4)^(2-)was 2.91 times that of NO_(3)^(-),the regional acid rain has changed from sulfuric acid rain to mixed sulfuric and nitric acid *** lake water is weakly acidic,with an average pH of 5.86,and the acidification frequency is 30.00%.Acidification of lake water is jointly affected by acid deposition and acid neutralization capacity of lake *** deposition has a profound impact on water acidification,and nitrogen(N)deposition,especially reduced N deposition,should be the focus of future research.