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首页> 外文期刊>Environmental Science & Technology >Seasonal Variations in Principal Groups of Organic Matter in a Eutrophic Lake Using Pyrolysis/GC/MS
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Seasonal Variations in Principal Groups of Organic Matter in a Eutrophic Lake Using Pyrolysis/GC/MS

机译：利用热解/ GC / MS分析富营养化湖泊中有机质主要族群的季节性变化

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摘要

The characteristics of natural organic matter (NOM), which affect its interactions with and therefore the transport of colloids and particles, depend on the evolution of its individual components. Information on the temporal variations of the components of the organic matter of a well-studied eutrophic lake (Bret, VD, Switzerland) was extracted using pyrolysis/ gas chromatography/mass spectrometry. The influence of aquagenic organic matter was found to be at a maximum in summer. The soil-derived organic matter, on the other hand, was found in larger proportions in winter and spring. The appearance of hydroxypropanone in the pyrolysis fragments in the summer months indicates that this portion of the organic matter is aquagenic and very fresh. The dominance of furaldehyde in pyrolysates during the rest of the year indicates the presence of polysac-charides may be of either aquagenic or pedogenic origin. The absence of lignin fragments found in the NOM in this lake suggests that lignin-containing components of terrestrial organic matter are not leached out from the soil in significant quantities. A correlation was found between 3-day cumulative rainfall and the proportion of terrestrial components in the identified organic matter in the spring. This correlation disappeared in the summer, probably because of a higher vegetal cover and the masking effect of the high aquagenic productivity. These factors are also likely to be of importance in more complicated lacustrine systems.
机译：天然有机物（NOM）的特性会影响其与胶体和颗粒之间的相互作用，进而影响胶体和颗粒的运输，这取决于其各个组分的演变。使用热解/气相色谱/质谱法提取了经过充分研究的富营养化湖泊（Bret，VD，瑞士）有机物各组分的时间变化信息。在夏季，发现水生有机物的影响最大。另一方面，在冬季和春季发现的土壤有机质含量较高。在夏季，热解碎片中出现了羟基丙烷酮，表明这部分有机物是水生的，非常新鲜。在这一年剩余的时间里，糠醛在热解产物中占主导地位，表明多糖的存在可能是水生的或成因的。在该湖泊的NOM中没有发现木质素碎片，这表明陆地生物有机物中含有木质素的成分并未大量浸出土壤。在春季的3天累积降雨与确定的有机质中地面成分的比例之间发现了相关性。这种相关性在夏季消失了，这可能是由于较高的植物覆盖率和高水生生产力的掩盖作用。这些因素在更复杂的湖泊系统中也很重要。

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