...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Atmospheric environment >Organic acids and aldehydes in rainwater in a northwest region of Spain
【24h】

Organic acids and aldehydes in rainwater in a northwest region of Spain

机译：西班牙西北地区雨水中的有机酸和醛

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

During a 1 year period, measurements of carboxylic acids and aldehydes were carried out in rainwater samples collected at nine different sites in NW Spain surrounding a thermal power plant in order to determine concentration levels and sources. In addition, certain major ions (Cl~-, NO_3~-, SO_4~(2-), Na~+, NH_4~+, K~+, Mg~(2+), Ca~(2+)) were also determined. Aldehyde and carboxylic acid concentration patterns and their effects on rainwater composition concerning temporal, seasonal and spatial variations were evaluated. Among carboxylic acids, formic and acetic were predominant (VWA 7.0 and 8.3 μM), while formaldehyde and acroleine were the dominant aldehydes (VWA 0.42 and 1.25 μM). Carboxylic acids were estimated to account for 27.5% of the total free acidity (TFA), whereas sulphuric and nitric acid accounted for 46.2% and 26.2%, respectively. Oxalic acid was demonstrated to be an important contributing compound to the acidification in rainwater representing 7.1% of the TFA. The concentration of aldehydes and carboxylic acids, which originated mainly from biogenic emissions in the area studied, was strongly dependent on the season of the year (growing and non-growing). The ratios of formic to acetic acids are considerably different in the two seasons suggesting that there exist distinct sources in both growing and non-growing seasons. Principal component analysis was applied in order to elucidate the sources of aldehydes and organic acids in rainwater. The prevalence of natural vegetative origins for both of these compounds versus anthropogenic emissions was demonstrated and the importance of the oxidation of aldehydes as a relevant source of organic acids was also established.
机译：在1年的时间里，对西班牙西北部火电厂周围9个不同地点收集的雨水样品中的羧酸和醛类进行了测定，以确定浓度水平和来源。此外，某些主要离子（Cl〜-，NO_3〜-，SO_4〜（2-），Na〜+，NH_4〜+，K〜+，Mg〜（2 +），Ca〜（2+））也是决心。评估了醛和羧酸的浓度模式及其对雨水成分的时间，季节和空间变化的影响。在羧酸中，甲酸和乙酸占主导地位（VWA 7.0和8.3μM），而甲醛和丙烯醛是占主导地位的醛（VWA 0.42和1.25μM）。估计羧酸占总游离酸度（TFA）的27.5％，而硫酸和硝酸分别占46.2％和26.2％。草酸被证明是雨水酸化的重要贡献化合物，占TFA的7.1％。醛和羧酸的浓度主要来自所研究区域的生物排放物，在很大程度上取决于一年中的季节（生长和不生长）。在两个季节中，甲酸与乙酸的比率存在很大差异，这表明在生长季节和非生长季节都存在不同的来源。为了阐明雨水中醛和有机酸的来源，进行了主成分分析。证明了这两种化合物的自然营养来源相对于人为排放的普遍性，并且还确立了醛氧化作为有机酸相关来源的重要性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号