Fluorescent dissolved organic matter (FDOM) in sediment pore waters from brackish area of
Lake Sihwa was studied using three-dimensional excitation emission matrix spectroscopy
(3D-EEMs). Additionally, in order to estimate the major controlling factors affecting the metals distribution patterns in the sediments, the mean grain size (Mz), the contents of organic matter(LOI), and metals were also analyzed. The average intensity of humic-like fluorophores(peak C)was 79 a.u. wherease the average of protein-like intensity(peak T2) was 298 a.u. in surface water. However, FDOM distributional patterns of sediments pore waters observed from 3D-EEMs showed two noticeable protein-like substances (peak T1 and T2), which were distinctively higher than surface waters. The average intensities of peak T1 and T2
were 568 a.u. and 702 a.u., respectively. In particular, the protein-like fluorescence intensity(peak T1) was significantly correlated with the concentration of NH4+ (regression rate, R2=0.8), which may be the results of microbial degradation of nitrogenous organic material such as amino acids in sediments. Factor analysis showed that Al, Fe, Mn, Cr, and V were strongly correlated with the mean grain size, whereas Cd, Hg, Pb, Zn, and Cu with the organic matter content.