2006-2015年安阳市大气降水化学特征及分析

Study on Characteristics and Analyses of Atmospheric Precipitation in Anyang City from 2006 to 2015

2006-2015年安阳市降水pH值经雨量加权平均后为7.05,酸雨发生率为0。Ca2+、SO_4^(2-)、NH4+、NO3-等是影响降水p H值的主要离子,并且SO_4^(2-)是NO_3^-浓度的4.0倍,这反映了安阳市能源消耗主要以煤为主。Daniel趋势校验表明大气降水SO_4^(2-)浓度及SO_4^(2-)负荷比均呈显著下降趋势,NO3-浓度呈上升但不显著趋势,但NO_3^-负荷比呈显著上升趋势,安阳市降水类型经历了从硫酸型到硫酸-硝酸混合型的过渡过程。这一趋势表明,随着经济的发展,氮氧化物的排放对安阳市大气污染的影响越来越明显。

The annual volume-weighted mean pH in rain was 7.05,The appear ration of acidic precipitation was zero,in Anyang City from 2006 to 2015.The atmospheric precipitation was mainly determined by Ca2＋,SO42-,NH4＋, NO3-,etc,and the average equivalent concentration of SO42- was 4.0 times larger than NOr;this reflects the Anyang city main energy consumption was coal.This paper takes out a trend analysis on precipitation type of Anyang City with the method of Daniel Test for Trend, the decrease of the average equivalent concentration of SO42- and the load ratio of SO42- were significant,the increase of the average equivalent concentration of NO3- was insignificant, but the increase of the load ratio of NO3- was significant.Anyang city precipitationl type has experienced the tran- sition from sulfuric acid type to sulphuric acid, nitric acid hybrid process.This trend has shown that the effects of NOx emissions were more and more obvious with economic development.