摘要
于2005年9月─2006年8月在南京市江北地区南京信息工程大学校园内采集降水样品共59个,测定pH和电导率,用离子色谱仪检测样品的阴、阳离子浓度.结果表明:pH为4.17~8.34,酸雨频率为49.2%,电导率为1.1~42.5 mS/m;阴离子为F^-,Cl^-,NO2^-和NO3^-,SO4^2-,阳离子为Na^+,K^+,Mg^2+,Ca^2+和NH4^+;主要阴、阳离子分别为SO4^2-,NO3^-,NH4^+和Ca^2+,并存在季节性变化.ρ(SO42-)/ρ(NO3-)的年均值为4.21,表明酸雨仍为硫酸型.南京市工业区的大气污染物主要是燃煤过程中排放的SO2等气体.
A total of 59 precipitation samples were collected on an event basis from September 2005 to August 2006 at Nanjing University of Information Science & Technology, which is in the north part of Nanjing. The pH and electric conductivity were measured. Concentration of ions and cations were determined by ion chromatography. The conclusions were as follows: The pH ranged from 4.17 to 8.34; the frequency of acid rain was 49.2% ; the electric conductivity changed in a range of 1.1 ~ 42.5 mS/m. Anions in the rain contained F^- , Cl^- , NO2^ - , NO3^- and SO4^2- , and especially SO4^2- and NO3^- were primary; cations were Na^+ , K^+ , Mg^2+ , Ca^2+ , NH4^+ , and NH4^+ and Ca^2+ took the most part. They all varied with season time. The annually averaged ratio of p (SO4^2- )/p (NO3^-) was 4.21, so the acid rain here belonged to sulphate-dominated type. The dominant atmospheric pollutant in this industrial estate was SO2 , discharging form the process of burning coal.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2007年第4期45-51,共7页
Research of Environmental Sciences
基金
江苏省"333工程"资助项目
江苏省六大人才高峰资助项目(2004)
关键词
大气降水
阴、阳离子
相关系数
precipitation
anions and cations
correlation coefficient