Study on Competitive Adsorption of As and DOM onto Amorphous Hydrous Ferric Oxides
Arsenic mobility in natural environments is controlled primarily by sorption onto metal oxide surfaces (e.g., hydrous ferric oxide, HFO), and the extent of this sorption may be influenced strongly by the presence of other dissolved substances that interact with surfaces of HFO or with arsenic itself. Dissolved organic matter (DOM), a prevalent constituent of natural waters, is highly reactive toward both metals and surfaces and is thus a clear candidate to influence arsenic mobility. In this paper, arsenic speciation and concentration were investigated in As-HFO, As-DOM, As-DOM-HFO systems, respectively. Ultraviolet-visible spectroscopy, emission spectrum and 3-D excitation emission matrixes were studied in DOM, DOM-HFO system. It was proved that both DOM and HFO could influence arsenic speciation and its occurrence, DOM could compete with arsenic to adsorb onto HFO and delayed the attainment of sorption equilibrium and diminished the extent of sorption of both arsenate and arsenite.
arsenic dissolved organic matter amorphous hydrous ferric oxides adsorption
DONG Lixian LI Penghui YAO Qin HUANG Qinghu CHEN Ling
Key Laboratory of Yangtze River Water Environment of Ministry of Education, College of Environmental State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and E
国际会议
2007环境科学与技术国际会议(The 2007 International Symposium on Environmental Science and Technology)
北京
英文
2007-11-13（万方平台首次上网日期，不代表论文的发表时间）