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of trace toxic organic compounds in aqueous and porous media environments, as well as the development and application of novel environmental analysis techniques, which are the extension of the research axis of his doctoral dissertation. In 2001, Professor Doong received the fellowship of the Alexander von Humboldt Foundation in Germany, and conducted visiting research work in the Department of Biology, University of Konstanz, Germany, under the host of Professor Berhard Schink. During his visit, Professor Doong merged the biologically anaerobic culture technology with environmental chemistry and gradually shifted the research theme to the microscopic characterization of the solid-liquid interface during the environmental processes of contaminants. The research work of this stage is really a crossdisciplinary research of environmental science and technology, and mainly focused on the transformation mechanism of pollutants in both the natural and anthropogenic environments. Results of these works have successfully clarified the plausible reasons for some phenomena, and solved the bottlenecks in environmental research including the use of simulated systems that resemble the natural environmental conditions to understand the fate and transport of chemical substances in the natural environment. According to the results obtained at this stage, several environmentally friendly technologies including heterogeneous catalysis and advanced oxidation processes (AOPs) have been developed to elucidate the reaction mechanism of naturally occurring species like dissolved organic matters (DOMs) and iron species for the dechlorination of %u7b2c%u4e09%u5341%u4e00%u5c46%u6771%u5143%u734e%uff0e%u79d1%u6280%u985e%u734e%u6a5f%u68b0 / %u6de8%u96f6%u6392%u653e / %u74b0%u5883%u79d1%u6280