A study on the Fractionation of Dissolved Organic Carbon in Lake and River Waters = 호수 및 하천수중에 있어서 용존유기물의 분획에 관한 연구

다국어 초록 (Multilingual Abstract)

Dissolved organic carbon(DOC) in Lake Kasumigaura, its inflowing rivers and several DOC sources in its catchment area was fractionated using three resin adsorbents into classes : aquatic humic substances (AHS=humic acid+fulvic acid), hydrophobic neutrals (HoN), hydrophilic acids(HiA), bases(BaS) and hydrophilic neutrals(HiN). The DOC fractionation produced interesting fraction distributions that were significantly different depending on the origin of sample. AHS and HiA prevailed over AHS in the lake while AHS and HiA existed at almost the same level in the rivers. AHS seems to be a more important component in river water than lake water. The dominance of organic acids was also observed for the waters of the DOC sources : forest stream(FS), Plowed field percolate(PFP), paddy field outflow(PFO), domestic sewage(DS) and sewage treatment plant effluent(STPE). However, the DOC fraction distributions reulted in more different distribution patterns. AHS dominated FS and PFP. HiA dominated PFO, DS and STPE. Only DS contained a significant amount of HoN, which may be due to the presence of LAS-like DOC. The ultraviolet absorbance over D0C(UV:D0C) ratio was found to a useful indicator for reflecting the characteristics of DOC, AHS and HiA and the origin of sample. The UV:D0C ratio in both lake and river waters was in the order of AHS, DOC, HiA. The lake water exhibited the lower ratios in DOC, AHS and HiA than the river waters did. Autochthonous DOC and AHS, which have been reported to have a lower UV:D0C ratio, may contribute significantly those in the lake. For AHS dominated FS and PFP, the ratio was in the order of DOC, AHS, HiA and DOC, HiA, AHS, respectively. PFO had the greatest UV:D0C ratio of AHS among the samples studied, indicating that the paddy field added up more pedogenic AHS to its overlaying water. For DS, the UV:D0C ratios of DOC, AHS and HiA were the lowest among fhe sanmles. Its AHS showed an UV:D0C ratio even less than those of HiA in all the other sarmp1es.

목차 (Table of Contents)

• 목차
• Abstract = 1
• Introduction = 1
• Materials and Methods = 3
• Results and Discussion = 6
• Summary = 10
• References = 11