鹰潭市降水化学组成特征分析

Analysis on characteristics of chemical composition of precipitation in Yingtan

对2002-2010年鹰潭市降水监测数据的综合分析和研究表明,研究时段内,降水pH值随着时间呈逐渐下降趋势,降水酸雨频率、电导率随时间呈上升趋势,降水中离子浓度的大小顺序为SO42->NH4+>NO3->Cl->Ca2+>F->Mg2+>K+>Na+,其中SO4 2-和NH4+是降水中高浓度离子,分别占总离子浓度的44.09%和21.34%,降水中阴离子总浓度显著高于阳离子总浓度;SO42-/NO3-(当量浓度比)为4.08,降水类型为硫酸型,但NO3-在降水酸性中起的作用有增大的趋势。

The comprehensive analysis and research of the monitoring data of rain in Yingtan City from 2002 to 2010 states that the pH value of rain goes down with time going while the frequency of acid rain and conductivity show a rising trend,the order of the consistency of ion in the rain is as followed： SO42- NH4＋ NO3- Cl- Ca2＋ F- Mg2 ＋ K＋ Na＋,and SO42-and NH4＋ are the ion of high concentration which take 44.09% and 21.34% in total concentration of ion separately during the research period.Meanwhile,the total concentration of anion in the rain is higher than the positive ion obviously.And SO42-/NO3-（equivalent concentration ratio）is 4.08 and the type of rain is sulfuric acid,but the effect of NO3-on the acidity of rain shows a rising trend.