Chemical characterization of dissolved organic matter in Hiroshima Bay, Japan

被引:25
作者
Fukushima, T
Ishibashi, T
Imai, A
机构
[1] Hiroshima Univ, Fac Engn, Hiroshima 7398527, Japan
[2] NJS Consultants Co Ltd, Minato Ku, Tokyo 1050022, Japan
[3] Natl Inst Environm Studies, Div Reg Environm, Tsukuba, Ibaraki 3050053, Japan
关键词
dissolved organic matter; variations in estuary; labile and refractory; hydrophobic and hydrophilic; UV-absorbance; synchronous fluorescence spectrum; molecular weight;
D O I
10.1006/ecss.2001.0777
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
The concentrations of dissolved organic carbon (DOC) and hydrophilic DOC (Hil-DOC) in Hiroshima Bay showed clear seasonal changes (high in summer and low in winter), suggesting the autochthonous production of Hil-DOC. The percentages of hydrophobic DOC (Hob-DOC) fractionated by XAD-8 resin were 33% for the bay waters and 41% for the river waters, whereas those of labile DOC (which decomposed during an incubation period of 100 days) were 20% and 24%, respectively. The increment of DOC to Chlorophyll a was calculated to be (0.014 mgl(-1))/(mu gl(-1)). The mixing experiments suggested a negligible deposition of DOC at the estuaries of inflowing rivers. The Hob-DOC went through the bay with negligible changes in concentration in both summer and winter, but its chemical characteristics, e.g. spectrophotometric properties and mean molecular weight, differed from those of riverine origin. In contrast, both labile and refractory components of Hil-DOC were produced mainly in the inner part of the bay during summer, and although a significant percentage of the labile component was subjected to biodegradation during transport to the outer part of the bay, its chemical characteristics did not change dramatically. (C) 2001 Academic Press.
引用
收藏
页码:51 / 62
页数:12
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