洱海沉积物间隙水中溶解有机质的地球化学特性
Geochemical characteristics of dissolved organic matter in the sediment pore water of Erhai Lake
查看参考文献28篇
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文摘
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对洱海沉积物间隙水中溶解有机质(DOM)含量、紫外-可见吸收、荧光以及分子量等的垂直分布特征进行了研究.结果表明,DOC含量在沉积物-水界面明显富集,随后急剧下降,6 cm处达到最小值,随后呈上升趋势.DOC与吸光度值、荧光发射光谱强度之间具有一定的线性相关关系.DOM的E3/E4值范围在1～6之间,绝大多数在1～3.5之间.表征DOM中腐殖质来源的指标荧光指数值处于1.48～1.59之间,说明DOM以陆源输入为主.此外,洱海沉积物间隙水DOM分子量分布呈多峰分布模式,重均分子量(Mw)值在1462～1953 Da之间,数均分子量(Mn)值在547～900 Da之间,多分散性ρ系数值在2.02～3.05之间.随着沉积深度增大,Mw和Mn有略微的增大趋势,但变化不大.沉积物的氧化还原条件、微生物活动以及铁、锰氧化物等在沉积剖面的差异是控制间隙水中DOM各种地球化学特性的主要因素. |
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其他语种文摘
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We study the DOC concentrations, the UV-Vis absorbance, fluorescence and the molecular weight of the dissolved organic matter in the sediment pore water of Erhai Lake. DOC concentration has a high value at the sediment-water interface, with a sharp decrease within the depth of 6 cm, and, then, increases later. The vertical distributions of ?254? a280 and fluo-rescence intensity at Ex = 335 ran are in agree with the distribution of DOC. The E3/ E4 values range from 1 to 6 and most of the values are less than 3.5, which means that the DOM in sediment pore water has relatively high humification, aromaticity and molecular weight. /450/500 values range from 1.48 to 1.59, showing the terrestrial nature of the majority of the sediment pore water DOM. Through the HPSEC results, all the sediment pore water DOM show a multi-modal distribution of the molec-ular weight. Weight-average molecular weight (MB), which ranges from 1462 to 1953 Da, and number-average molecular weight ( Mn) , which ranges from 547 to 900 Da, vary a little along the depth and mainly have a trend of increase. The poly-dispersity, p (the ration of Mm to Mn) ranges from 2.02 to 3.05, which suggests that the pore water DOM resides in a rela-tively wide size distribution. In general, the geochemical characteristics of sediment pore water DOM are attributed to the changes in redox chemistry occurrs as a function of the sediment depth, partial mineralization of particulate organic matter as a result of the biotic or abiotic reduction and the effect of metal oxide through the dissolution and formation process. |
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来源
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水科学进展
,2005,16(3):338-344 【核心库】
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关键词
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溶解有机质
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沉积物间隙水
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荧光
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高效体积排阻色谱
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洱海
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地球化学特征
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-6791 |
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学科
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地质学;环境科学基础理论 |
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基金
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国家自然科学基金
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国家973计划
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中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:2019521
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