Date & Time：9:00-11:00AM, 4th November ( Wednesday)
Online meeting: Tencent Meeting (ID：899 186 797)
Link: https://meeting.tencent.com/s/TkRMNeAoOwv3
Speaker：Professor Guo Laodong from University of Wisconsin
Abstract:
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.
