基于水生植物分区的湖泊DOM与重金属离子的结合特性研究

发布时间：2017-12-30 18:26

本文关键词：基于水生植物分区的湖泊DOM与重金属离子的结合特性研究　出处：《农业环境科学学报》2015年12期 　论文类型：期刊论文

【摘要】：以乌梁素海龙须眼子菜、芦苇和穗花狐尾藻3类优势种主要分布区上覆水中的溶解性有机质(Dissolved organic matter,DOM)为研究对象,开展了湖泊不同植物类型区上覆水中DOM与Cu~(2+)、Pb~(2+)、Cd~(2+)的结合特性研究。结果表明,与穗花狐尾藻区相比,芦苇区和龙须眼子菜区上覆水中DOM的芳香度高、分子量低,与重金属的结合率较高,且以Cu~(2+)为最;芦苇区上覆水中DOM与重金属离子的饱和结合量、羟基与羧基峰面积特征揭示,该区上覆水中DOM含有更多可与重金属离子发生结合反应的活性基团;穗花狐尾藻区上覆水中DOM的多脂肪族化合物与分子量较高的特征,影响了与重金属离子的结合特性。来源于不同植物类型区上覆水的DOM在分子量、脂肪性及官能团等结构特征方面的差异是其与重金属离子结合特性的影响因素。
[Abstract]:The dissolved organic matter dissolved organic matter in the overlying water of the dominant species of three dominant species, I. e., Phyllostachys australis, Phragmites australis and Cyanophyta spp., were isolated from the overlying water. The binding characteristics of DOM and Cu~(2 in overlying water of different plant types in lakes were studied. Compared with the Sargassum spp., the aromaticity and molecular weight of DOM in the overlying water were higher, and the binding rate with heavy metals was higher, and Cu~(2 was the most important. The saturation binding capacity of DOM and heavy metal ions in the overlying water of Reed region and the area characteristics of hydroxyl and carboxyl groups show that DOM in the overlying water contains more active groups which can react with heavy metal ions. The characteristics of high molecular weight and polyaliphatic compounds of DOM in the overlying water of Sargassum spp affected the binding characteristics of DOM with heavy metal ions. The molecular weight of DOM from the overlying water of different plant types was found to be in the molecular weight. The differences in structural characteristics, such as fat and functional groups, are the factors influencing the binding characteristics of heavy metal ions.
【作者单位】：内蒙古大学环境与资源学院;内蒙古大学环境地质研究所;
【基金】：国家自然科学基金项目(41163006)
【分类号】：X524
【正文快照】： 溶解性有机质(Dissolved organic matter,DOM)是一种活性组分,含有较多活性点位,广泛存在于水体、土壤等环境介质中,能与重金属结合,进而影响重金属在水环境中的环境地球化学行为[1-4]。DOM的来源不同,其腐殖化程度、分子量大小、官能团种类及含量等不同,与重金属的结合特性也

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