摘要
该文在2015-2019年安徽省大气降水监测数据的基础上,分析了大气降水化学离子组成特征及变化趋势。结果表明,近5年安徽省大气降水pH年均值范围5.69~5.93,电导率年均值范围2.61~4.58 mS/m。降水中总离子浓度呈下降趋势。NH_(4)^(+)、Ca^(2+)是降水中主要阳离子,NO_(3)^(-)、SO_(4)^(2-)是降水中主要阴离子,4种离子浓度之和占总浓度的72.59%。近5年主要致酸物质组成发生变化,酸雨类型逐渐向硫酸-硝酸混合型过渡,这可能与安徽省全省机动车保有量迅速增加有关。降水离子化学组分的相关性较好,降水中SO_(4)^(2-)的致酸作用和Ca^(2+)的中和作用在下降,Cl^(-)的致酸作用仍继续存在。
Based on the precipitation monitoring data of Anhui Province from 2015 to 2019,major chemical ions composition characteristics and tendency were analyzed.The results showed that the average pH and electrical conductivity were5.69~5.93 and 2.61~4.58 mS/m respectively in recent five years.The total ionic concentration of the precipitation declined.NH_(4)^(+),Ca^(2+)and NO_(3)^(-),SO_(4)^(2-)were the main cations and anions in the precipitation respectively,accounting for 72.59%of the whole molar concentration.The main acidic composition changed in recent five years and the type of acid rain gradually transited to sulfur-nitrous,which probably related to rapid increase of vehicles of the province.The chemical composition of precipitation had well relevancy.It was also found that the acidic contribution of SO_(4)^(2-)and neutralization of Ca^(2+)was decreasing,while the contribution of acidity of Cl^(-)still existed.
作者
孙亚敏
王欢
SUN Yamin;WANG Huan(Anhui Eco-environmental Monitoring Center,Hefei 230061,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2021年第S02期89-92,共4页
Environmental Science & Technology
关键词
降水
组分
特征
趋势
precipitation
composition
characteristics
tendency
