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【学术报告】Natural dissolved organic matter: heterogeneity, characterization and environmental roles

2020-10-27

报告时间:2020年11月4日(星期三)上午9:00-11:00

线上腾讯会议ID:899 186 797

会议链接: https://meeting.tencent.com/s/TkRMNeAoOwv3

嘉宾:郭劳动(美国威斯康星大学教授)



 

嘉宾简介:

现任美国威斯康星大学Milwaukee分校淡水科学学院教授(2012-present),博士毕业于美国得克萨斯A&M大学,曾任威斯康星大学Milwaukee分校淡水科学学院Executive Committee Chair (2013-2015),南密西西比大学海洋科学系副教授/教授(2005-2012) 阿拉斯加大学助理教授/副教授(2000-2005),得克萨斯A&M大学Galveston分校助理研究员(1997-2000)/博士后(1995-1997)

曾任厦门大学客座教授(2004), 教育部长江学者讲座教授(2007), 中国海洋大学客座教授(2008), 中国科学院海外评审专家(2016), 天津大学客座教授(2018).

主要从事:aquatic biogeochemistry, 有机碳、营养盐、微量元素的生物地球化学循环的研究。已发表论文近200篇。Web of Science H-指数47, 谷歌学术 (Google Scholar) H-指数 56,论文引用1万多次。

现任《Journal of Oceanography 》和《Frontiers in Environmental Science-Biogeochemical Dynamics》的副主编,Scientific Reports》、《Water》《Journal of Marine Science and Engineering》等杂志的编委会成员; 是美国以外九个国家或地区的科研基金评审人或评审委员会成员。

 

报告摘要:

Natural dissolved organic matter: heterogeneity, characterization and environmental roles

 

Due to its polymeric, polyfunctional, and polydispersive nature, dissolved organic matter (DOM) plays an essential role in regulating the solubility and chemical speciation of trace metals, the surface properties and toxicity of nanoparticles, and the fate and transport of organic contaminants, thus influencing water quality, ecological functions, and biogeochemical processes in aquatic environments.  Recent studies have increased our knowledge about the composition, sources, and reactivities of DOM. However, natural DOM is highly heterogeneous, containing various organic components and functional groups with different molecular size spectra. A number of analytical and hyphenated techniques have been applied to the characterization of DOM.  Since each method has its inherent limitations, characterization and quantification of unknown DOM properties have presented challenges.  In this presentation, I will summarize recent advances in the characterization of DOM size spectra, composition and reactivity in the aquatic continuum. Case studies showing the heterogeneity of bulk DOM in natural waters and its environmental behavior across biogeochemical interfaces will be discussed.

 

 

 



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