...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology: ES&T >Preliminary Study of Lake Dissolved Organic Matter in Light of Nanoscale Supramojecular Assembly
【24h】

Preliminary Study of Lake Dissolved Organic Matter in Light of Nanoscale Supramojecular Assembly

机译：纳米尺度超云层组装下湖泊溶解有机物的初步研究

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

Large-scale preparative high-performance size-exclusion chromatography(HPSEC)was performed to separate different molecular size fractions in milligram quantities from strongly colored dissolved organic matter(DOM)of a freshwater using a very mild conjugate acid-base pair(10 mM acetic acid-sodium acetate solution at pH 7.0 with an ionic strength of 6 X 10~(-5))as the mobile phase.The homogeneity-uniformity of different molecular size fractions in relation to their combined original mixture was verified by an analytical HPSEC system.In addition to molecular size distribution and basic spectroscopic characteristics,Fouriertransform infrared spectroscopy was applied to specify structural features for different size fractions.The results demonstrate clearly that only a very small amount of conjugate organic acid-base pair is required to generate a powerful resolution for a DOM mixture,and very strong treatments with organic acids are not necessarily needed to reach a better SEC resolution.Most essential is the combined outcome of different HPSEC experiments and determined structural functionalities which indicate that almost all original DOM solutes are aggregated mixtures consisting of different associations possessing various molecular size ranges,which can be separated from their integrated whole as nearly homogeneous and uniform species.In summary,the present study strongly speaks for the need to direct the research of natural dissolved and colloidal organic carbon more strongly toward a nanoscale study of supramolecular assemblies.More precise knowledge about the primary,secondary,and tertiary structure of dissolved DOM constituents has its essential function,e.g.,for environmental protection and utilization of surface waters.
机译：以极温和的共轭酸碱对（10 mM乙酸-乙酸钠溶液，pH 7.0，离子强度为6 X 10~（-5））为流动相，从淡水中的强色溶解有机物（DOM）中分离出不同分子大小的分数（以毫克为单位），采用大规模制备型高效尺寸排阻色谱（HPSEC）进行分离。通过分析HPSEC系统验证了不同分子尺寸组分与其组合原始混合物的均匀性。除了分子尺寸分布和基本光谱特性外，还应用傅里叶变换红外光谱来指定不同尺寸组分的结构特征。结果清楚地表明，只需要非常少量的共轭有机酸碱对即可为DOM混合物产生强大的分辨率，并且不一定需要非常强的有机酸处理才能达到更好的SEC分辨率。最重要的是不同HPSEC实验和确定的结构官能团的综合结果，表明几乎所有原始DOM溶质都是由具有不同分子尺寸范围的不同结合体组成的聚集混合物，可以将其从其整体中分离出来，成为几乎同质和均匀的物质。综上所述，本研究强烈地表明，有必要将天然溶解和胶体有机碳的研究更强烈地转向超分子组装的纳米级研究。更精确地了解溶解DOM成分的一级、二级和三级结构具有其基本功能，例如，用于环境保护和地表水的利用。

著录项

  • 来源
    《Environmental Science & Technology: ES&T》 |2004年第22期|5958-5967|共10页
  • 作者

    Juhani Peuravuori; Kalevi Pihlaja;

  • 作者单位

    Physical Chemistry,Department of Chemistry,University of Turku,FIN-20014 Turku,Finland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 环境化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
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