沉积物不同提取态有机物特征及水文地球化学意义——以河套盆地典型研究区为例

发布时间：2018-06-25 22:52

本文选题：沉积物 + 地下水　；参考：《水文地质工程地质》2017年02期

【摘要】：地下水系统中有机物(OM)特征和活性对于地下水化学特征的形成和演化起着十分重要的作用。将内蒙古河套盆地表层湖相沉积物按10 cm间隔采集,并对沉积有机质的性质及来源进行重点分析。测量了不同深度上不同岩性沉积物的色度、水溶性有机物(WEOM)和盐溶性有机物(SEOM)含量及其光谱学特性。结果显示,沉积物的色度(R530-520)与TOC含量呈现相反的变化趋势:色度值较大时,TOC含量反而较小。相对于细砂层,黏土层的色度值较低,但TOC含量较高。相同的沉积物中,SEOM含量高于WEOM,但WEOM更易迁移至地下水中。有机物的光谱指数表明,WEOM以微生物来源为主,而SEOM以陆源为主。通过三维荧光光谱分析发现,荧光强度和沉积物有机碳(SOC)含量呈正相关;黏土层沉积有机物荧光强度更高;WEOM和SEOM均含类腐殖质成分和类蛋白成分,但SEOM中腐殖质成分较高;类腐殖质是所研究的沉积物中OM最主要的存在形式。
[Abstract]:The characteristics and activities of organic matter (OM) in groundwater system play an important role in the formation and evolution of groundwater chemical characteristics. The surface lacustrine sediments of Hetao Basin were collected at a interval of 10 cm and the characteristics and sources of sedimentary organic matter were analyzed emphatically. The chromaticity, content of water-soluble organic matter (WEOM) and salt-soluble organic substance (SEOM) of different lithologic sediments at different depths and their spectroscopic properties were measured. The results showed that the chromaticity of sediment (R530-520) and TOC content showed the opposite trend: the content of TOC was smaller when the chroma value was larger. Compared with fine sand layer, the color value of clay layer is lower, but the content of TOC is higher. The content of SEOM in the same sediment is higher than that in WEOM, but WEOM is easier to migrate to groundwater. The spectral index of organic matter indicated that the microorganism was the main source of WEOM, while the SEOM was mainly terrestrial. It was found that the fluorescence intensity was positively correlated with the content of organic carbon (SOC) in sediment, and that the fluorescence intensity of organic matter in clay layer was higher than that in the clay layer. Both WEOM and SEOM contained humus-like and protein-like components, but the humus components in SEOM were higher. Humus-like substance is the most important form of OM in sediments studied.
【作者单位】：中国地质大学(北京)水资源与环境学院;教育部地下水循环与环境演化重点实验室;
【基金】：国家自然科学基金(41222020、41672225)
【分类号】：P641.3

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