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Seasonal characteristics of surface water fulvic acids from Lake Biwa and Lake Tankai in Japan

机译：日本琵琶湖和短池湖地表富水酸的季节性特征

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摘要

Seasonal characteristics of surface water fulvic acids (FAs) isolated from Japanese clear-water lakes were investigated. Qualitative changes in Lake Biwa and Lake Tankai FAs were determined and compared. Although the relative molecular weights determined by high-performance size-exclusion chromatography did not change remarkably, the elemental compositions, $ E_{600}^{1% } $ values and 1H- and 13C-NMR spectral properties varied with the season. Both the H/C and N/C ratios for Lake Biwa FAs tended to be higher than those for Lake Tankai FAs, but O/C ratios were lower and decreased from spring to winter. The $ E_{600}^{1% } $ values suggested that Lake Biwa FAs contained lower levels of unsaturated structures than Lake Tankai FAs, and the amounts of these structures increased in winter. The 1H and 13C NMR spectra indicated that Lake Biwa FAs are richer in saturated aliphatic chains, especially in spring. Overall, Lake Biwa FAs exhibited clearer seasonal changes in these characteristics than Lake Tankai FAs, suggesting that the seasonal variation may depend on changes in aquatic microbial activities.
机译：研究了从日本清水湖中分离出的地表水富里酸（FAs）的季节性特征。确定并比较了琵琶湖和坦凯湖FA的质变。尽管通过高效排阻色谱法测定的相对分子量没有明显变化，但元素组成，$ E_ {600} ^ {1％} $值以及1 H-和13 C -NMR光谱性质随季节变化。琵琶湖FA的H / C和N / C比值往往都比Tankai湖FA的H / C和N / C值都高，但是从春季到冬季，O / C值较低且有所降低。 $ E_ {600} ^ {1％} $的值表明，琵琶湖FAs的非饱和结构含量低于Tankai湖FAs，并且这些结构的数量在冬季增加。 1 H和13 C NMR光谱表明，琵琶湖的FA富含饱和脂肪链，尤其是在春季。总体而言，比瓦湖FAs的琵琶湖FAs在这些特征上表现出更清晰的季节变化，表明季节变化可能取决于水生微生物活动的变化。

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  • 来源
    《Limnology》 |2012年第1期|p.45-53|共9页
  • 作者

    Nobuhide Fujitake; Kumiko Tsuda; Suzuka Aso; Hiroki Kodama; Masahiro Maruo; Koyo Yonebayashi;

  • 作者单位

    Graduate School of Agricultural Science, Kobe University, Rokkodai 1, Kobe, Hyogo, 657-8501, Japan;

    Graduate School of Science and Technology, Kobe University, Rokkodai 1, Kobe, Hyogo, 657-8501, Japan;

    Graduate School of Agricultural Science, Kobe University, Rokkodai 1, Kobe, Hyogo, 657-8501, Japan;

    Analytical Research Center for Experimental Science, Saga University, Honjo 1, Saga, 840-8502, Japan;

    Department of Environmental Science, The University of Shiga Prefecture, Hassaka 2500, Hikone, Shiga, 522-8533, Japan;

    Department of Environmental Science, Ishikawa Prefectural University, Suematsu 1-308, Nonoichi, Ishikawa, 921-8836, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fulvic acid (FA); Clear water; Aliphatic structure; Seasonal change;

    机译：黄腐酸;透明水;脂族结构;季节变化;

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