南昌市新城区大气降水化学特征与主要成分来源解析

发布时间：2018-01-19 01:16

  本文关键词： 大气降水 化学特征 离子 南昌市　出处：《环境科学研究》2016年11期 　论文类型：期刊论文

【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p H、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p H介于3.67~5.86之间,降水量加权平均值为4.63;电导率在6.13~73.01μS湓cm之间,降水量加权平均值为29.02μS湓cm;降水中总离子浓度为154.1~474.3μeq湓L,降水量加权平均值为300.1μeq湓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-湓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.
[Abstract]:In order to understand the chemical characteristics and sources of precipitation in Xincheng District of Nanchang 39 local effective precipitation samples were collected from May 15th 2013 to January 24th 2014 and their precipitation chemical characteristics were analyzed. These include pH, electrical conductivity and the main ions, Na, NH _ 4, K, mg _ 2, Ca ~ (2 +), F ~ (-) ~ (-) ~ (-). The results show that the precipitation pH of Nanchang city is between 3.67 and 5.86, and the weighted average of precipitation is 4.63; The conductivity is between 6.13 渭 S and 73.01 渭 S, and the weighted average of precipitation is 29.02 渭 S / cm. The total ion concentration in precipitation is 154.1 渭 eq 474.3 渭 eq / L, and the weighted average of precipitation is 300.1 渭 eq / L so _ 42-Ca ~ (2 +). NH4 and NO3- are the main ions in precipitation, which account for 82.6% of the total ion concentration. The ratio of equivalent ion concentration to so _ 42-no _ 3-is between 1.82 and 3.61. The average value is 2.66.The acidogenic substances of precipitation in Xincheng District of Nanchang City are neutralized by alkaline substances in the atmosphere with relative acidity of 0.43% and 57.0%, and the main acidity neutralization factors are Ca2 and NH4. The neutralization amounts of 50.0% and 36.6% were contributed respectively. The anion was mainly from artificial sources according to the anion triangulation. The enrichment coefficient analysis shows that 99.5% of Ca2 ~ (88. 4%) and 63.0% of Mg2 are from crustal sources. The ocean source input of Mg2 K ~ + Ca ~ (2 +) was 30.7% and 0.5%, respectively. In 1.2%, 55.8% of Cl- from crustal sources came from oceanic sources and 43.0% from anthropogenic sources. 96.8% of so _ 42- and 99.5% of no _ 3- came from artificial sources. The study shows that the precipitation in Xincheng District of Nanchang City is a mixed type of precipitation, and the anthropogenic sources have an important impact on the atmospheric environment.
【正文快照】： 第 29 卷 第 11 期 2016 年 11 月 环 境 科 学 研 究 Ｒesearch of Environmental Sciences Vol． 29 ， No． 11 Nov． ，， 2016 收稿日期: 2016-05-04 修订日期: 2016-07-18 基金项目: 国家自然科学基金项目( 41265009 ) 作者简介: 魏

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