南京市江北工业区降水酸性及化学成分分析

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-，SO₄2-,阳离子为Na+，K+，Mg2+，Ca2+和NH₄+；主要阴、阳离子分别为SO₄2-，NO₃-, NH₄+和Ca2+,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. 

The Analysis of Precipitation Acidity and Chemical Composition in the Industrial Estate Located on North Bank of the Yangtze River, Nanjing

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 conductivitywere 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 SO₄2-, and especially SO₄2- and NO₃- were primary; cations were Na+, K+, Mg2+, Ca2+, NH₄+,and NH₄+ and Ca2+ took the most part. They all varied with season time. The annually averaged ratio of ρ(SO₄2-)/ρ(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.