M8 AM Persistent Organic Pollutants
Monday, 14 November 2005: 8:00 AM - 11:40 AM in 337-338

(AAA-1117-815905) The mechanism of interaction between polycyclic aromatic hydrocarbons and natural organic matter.

He, M¹, ¹ State Key Labortary of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, China

ABSTRACT- The mechanism of interaction between polycyclic aromatic hydrocarbons and natural organic matter from sediment of different regions is studied. The sediments were collected from different regions of China. The humic acid was extracted from these sediments, and the element analysis, FT-IR spectrum and solid-state CP/MAS 13C NMR were used to obtain the structure and compositional information of humic acids. The sorption of polycyclic aromatic hydrocarbons by humic acids were examined in batch sorption experiments. There were big differences on the contents of C, H, N, and O among humic acid that extracted from those 9 kinds of river or lake sediments. Although the humic acid from different sediments showed very similar FT-IR spectrum character, detailed analysis showed that there were some differences among them. By using CP/MAS 13C NMR to analyze the spectra characteristics of humic acid, along with the comparison of the humic acid absorption experimental results, it was found that for non polar organic pollutants, there was a positive correlation between absorption capacity of humic acid and its aliphaticity, but showed negative correlation with its aromaticity.

Key words: Humic acids, PAHs, Adsorption