| Title |
Study on the Characteristics of Dissolved Organic Matters from Diverse Sources by XAD Resin Fractiontion and Microbial Incubation Experiments |
| Authors |
오세진 ( Sei Jin Oh ) ; 최찬규 ( Chan Kyu Choi ) ; 허진 ( Jin Hur ) ; 정명숙 ( Myung Sook Jung ) ; 신현상 ( Hyun Sang Shin ) |
| Keywords |
Biodegradability; Dissolved organic matter (DOM); Hydrophobic; Microbial Changes; Resin fractionation |
| Abstract |
In this study, characteristics of dissolved organic matter (DOM) from Lake Paldang and seven other DOM sources (lake plankton, plants, soil, composite, treated sewage) were studied using XAD resin fractionation and 28-day microbial incubation experiment. Distribution patterns of DOM-fractions, which include hydrophilic acids (HiA), hydrophilic bases (HiB), hydrophilic neutrals (HiN), hydrophobic acids (HoA), hydrophobic neutrals (HoN) and the extent of DOM biodegradation (i.e., biodegradability) were different depending on the origins of the DOM samples. The DOM distribution pattern and the biodegradability were found to be effective for distinguishing the different DOM sources. The biodegradability (%) had negative correlations with the content (%) of hydrophobic fractions (Ho) and specific UV absorbance of DOM. which indicate that the Ho fractions contain more aromatic carbon structures and relatively stable during biodegradation, irrespective of the sources. To gain additional insight into the microbial transformation of the DOM, we also investigated the changes in the fraction`s distribution for plankton, leaf litter and composite samples after the incubation. The results showed that biodegradation of hydrophilic fraction (Hi) causes an increase in the proportion of Ho (HoA. HoN), while biodegradation of HoA increases the HoN production. |