Quantitative monitoring of aquatic humic substances in Lake Biwa,Japan, using the DAX-8 batch method based on carbon concentrations |
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| Institution: | 1. Graduate School of Agricultural Science, Kobe University, Rokkodai 1, Nada, Kobe, Hyogo 657-8501, Japan;2. Graduate School of Science and Technology, Kobe University, Rokkodai 1, Nada, Kobe, Hyogo 657-8501, Japan;3. Lake Biwa Environmental Research Institute, Yanagasaki 5-34, Otsu, Shiga 520-0022, Japan;4. School of Human Science and Environment, University of Hyogo, Gakuen-nishi 8-2-1, Nishi, Kobe, Hyogo 651-2197, Japan;1. School of Biosystems Engineering, Agriculture and Food Science Centre, University College Dublin, Belfield, Dublin 4, Ireland;2. School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland;3. Teagasc Food Research Centre, Ashtown, Dublin 15, Ireland;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China;2. University of Geosciences, Beijing 100083, China;3. Xinjiang Petroleum Institute, PetroChina, Karamay 83400, China;4. Exploration & Production Research Institute, Sinopec, Beijing 100083, China;1. Graduate School of Bioscience and Biotechnology, Fukui Prefectural University, Obama, Fukui 917-0003, Japan;2. Department of Marine Bioscience, Fukui Prefectural University, Obama, Fukui 917-0003, Japan |
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| Abstract: | Aquatic humic substances (AHS) have been intensively studied because they have a number of significant biogeochemical functions in water chemistry. In order to evaluate such functions, which are regulated by their quantity and quality, a quantitative understanding of AHS is necessary. This study shows the seasonal and vertical changes in the AHS concentration in Lake Biwa, the largest monomictic lake in Japan, over 4 years. The concentration of dissolved organic matter carbon (DOM-C) and AHS carbon (AHS-C) ranged from 0.85–1.6 mg C/l and 0.32–0.71 mg C/l, respectively. The percentages of AHS-C in the DOM-C ranged from 32% to 65%. At all depths, the DOM-C decreased and the AHS-C slightly increased or remained at nearly the same level, suggesting that the quality of the water may have changed mainly due to changes in the composition of the organic matter. Although the AHS-C to DOM-C ratio fluctuated and had no seasonal tendency, the average AHS-C ratio increased during the 4 year monitoring period. Because AHS can influence the entire food web starting with phytoplankton, unraveling the mechanism by which they accumulate remains an important goal. |
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| Keywords: | Dissolved organic matter (DOM) Refractory organic matter (ROM) Natural organic matter (NOM) Quantitative analysis Abundance Clear water |
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