摘要
近年来,以辽中工业群为代表的北方地区酸雨污染问题备受关注,对区域经济社会发展正在形成越来越明显的影响。为了深入了解辽中工业群地区酸雨污染特征,本研究利用XHARS30C酸雨自动采样仪系统采集了辽中地区2007年2月-2008年1月为期1年的降水样品,通过对降水样品pH值、主要阴阳离子组成的测定,分析了辽中地区酸雨的特征以及影响降水酸度的主要因素。结果表明,观测期间辽中地区降水pH值平均为5.15,酸雨频率为69.4%;雨水的主要离子组成为SO42-、NO3-和NH4+、Ca2+、Mg2+;在降雨过程中5种离子中的SO42-、NO3-、NH4+、Mg2+随降雨增加浓度呈U型变化,而Ca2+无明显规律;SO42-为主导性酸性离子,但NO3-对雨水酸度的影响不可忽视;辽中降水中起主要中和作用的是扬尘中的Mg化合物和与人类活动密切相关的NH3,扬尘中含Ca化合物中和作用相对较小。
In recent years, acid rain in north China especially in Liaozhong urban industrial agglomeration of Liaoning Procince has attracted more and more attention. Acid rain is becoming one of the main adverse inflluencing factors on local economic and social development. To understand the characteristics acid rain pollution of Liaozhong industrial agglomeration, all acid rain samples were collected by XHARS30C acid rain automatic sampler during the period from Feb. 2007 to Jan. 2008 for determining pH values and major cation of acid rain, then the characteristics and primary factors of acid rain in Liaozhong were analyzed. 3he results showed that the mean pH values of precipitation during observation time was 5.15, and 69.4% of precipitation were acid rain; the ionic composition analysis indicated that SO4^2- , NO3^- , NH4^＋ , Ca^2＋ and Mg^2＋ were the dominant ions in the preeipitation; the concentration of SO4^2- , NO3^- , NH4^ ＋ and Mg^2＋ in different process during one precipitation presented as a U-shape changing pattern, while Ca^2＋ did not show such an obvious changing pattern; SO4^2- is the dominant acidic ion of the precipitation in Liaozhong, but NO3^- has become more and more important to the acidity of precipitation; dust sourced Mg^2＋ and anthropogenic emission NH3 appeared to play a more significant role than dust sourced Ca^2＋ in neutralizing the acidity in precipitation.
出处
《中国人口·资源与环境》
CSSCI
北大核心
2010年第10期142-146,共5页
China Population,Resources and Environment
基金
国家"973"项目(编号:2005CB422208)资助
关键词
酸雨
离子组成
主控因子
中和作用
acid rain
ionic composition
primary factor
neutralization
