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南昌市新城区大气降水化学特征与主要成分来源解析

魏宸 黄虹 邹长伟 周熠

魏宸, 黄虹, 邹长伟, 周熠. 南昌市新城区大气降水化学特征与主要成分来源解析[J]. 环境科学研究, 2016, 29(11): 1582-1589.
引用本文: 魏宸, 黄虹, 邹长伟, 周熠. 南昌市新城区大气降水化学特征与主要成分来源解析[J]. 环境科学研究, 2016, 29(11): 1582-1589.
WEI Chen, HUANG Hong, ZOU Changwei, ZHOU Yi. Chemical Characteristics and Main Sources of Atmospheric Precipitation in New Urban District of Nanchang City[J]. Research of Environmental Sciences, 2016, 29(11): 1582-1589.
Citation: WEI Chen, HUANG Hong, ZOU Changwei, ZHOU Yi. Chemical Characteristics and Main Sources of Atmospheric Precipitation in New Urban District of Nanchang City[J]. Research of Environmental Sciences, 2016, 29(11): 1582-1589.

南昌市新城区大气降水化学特征与主要成分来源解析

基金项目: 国家自然科学基金项目(41265009)

Chemical Characteristics and Main Sources of Atmospheric Precipitation in New Urban District of Nanchang City

  • 摘要: 为了解南昌新城区大气降水化学特性和来源,于2013年5月15日—2014年1月24日采集当地有效降水样品39个,分析其降水化学特性,包括pH、电导率和主要离子(Na+、NH4+、K+、Mg2+、Ca2+、F-、Cl-、NO3-和SO42-)的浓度.结果表明:南昌市新城区降水pH介于3.67~5.86之间,降水量加权平均值为4.63;电导率在6.13~73.01 μS/cm之间,降水量加权平均值为29.02 μS/cm;降水中总离子浓度为154.1~474.3 μeq/L,降水量加权平均值为300.1 μeq/L.SO42-、Ca2+、NH4+和NO3-是降水中的主要离子,合计占总离子浓度的82.6%.SO42-/NO3-(当量离子浓度比)在1.82~3.61之间,平均值为2.66.南昌市新城区降水相对酸度为0.43,57.0%的致酸物质被大气中碱性物质中和,主要的酸度中和因子为Ca2+和NH4+,分别贡献50.0%和36.6%的中和量.阴阳离子三角图分析表明,阴离子主要来自人为源;阳离子来源包括地壳源和人为源.富集系数分析表明,99.5%的Ca2+、88.4%的K+、63.0%的Mg2+来自地壳源;Mg2+、K+、Ca2+的海洋源输入分别为30.7%、4.6%和0.5%;1.2%的Cl-来自地壳源,55.8%来自海洋源,43.0%来自人为源;96.8%的SO42-和99.5%的NO3-来自人为源.研究显示,南昌市新城区的降水为混合型降水,人为源对大气环境产生了重要影响.

     

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出版历程
  • 收稿日期:  2016-05-04
  • 修回日期:  2016-07-18
  • 刊出日期:  2016-11-25

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