同步辐射微区X射线荧光光谱法原位分析蚯蚓中K,Ca,Cu,Zn和Pb

发布时间：2018-01-02 13:38

本文关键词：同步辐射微区X射线荧光光谱法原位分析蚯蚓中K,Ca,Cu,Zn和Pb　出处：《分析化学》2016年05期 　论文类型：期刊论文

【摘要】：为了研究重金属元素在蚯蚓体内的富集和存储机制,使用同步辐射微区X射线荧光光谱法(μ-SRXRF)研究了K,Ca,Cu,Zn和Pb元素在生长于南京栖霞山铅锌矿区附近菜园土壤的蚯蚓体内的分布特征,发现Pb主要富集在蚯蚓后部消化道周围的区域,Zn,Cu在蚯蚓后部的分布规律与Pb类似,推测后部消化道周围区域的分布是蚯蚓为了阻断毒性重金属元素威胁而特有的富集和存储方式。5种元素的相关性表明,Pb和Zn相关性最高,存储方式最为相似,Pb与K和Ca在蚯蚓后部的分布呈显著正相关,说明毒性元素Pb在蚯蚓体内的富集和存储过程可能伴随着其它元素的吸收。本研究表明,μ-SRXRF在原位微区分析蚯蚓样品的元素空间分布方面具有很大优势,而进一步开展土壤及蚯蚓中Pb的形态研究,是研究重金属胁迫下蚯蚓解毒机制的重要前提。
[Abstract]:In order to study the accumulation and storage mechanism of heavy metal elements in earthworms, the synchrotron radiation microregion X-ray fluorescence spectrometry (渭 -SRXRF-) was used to study the mechanism of accumulation and storage of heavy metals in earthworms. The distribution characteristics of Zn and Pb elements in the soil of vegetable garden near Qixia Mountain, Nanjing, China. It is found that Pb is mainly concentrated in the area around the digestive tract of the back of earthworm. The distribution of Cu in the back of earthworm is similar to that of Pb. It is inferred that the distribution of the surrounding area of the posterior digestive tract is the characteristic enrichment and storage mode of the earthworm in order to block the threat of toxic heavy metal elements, which indicates that the correlation between Pb and Zn is the highest. The distribution of Pb, K and Ca in the back of earthworm was significantly positive correlation. It is suggested that the accumulation and storage process of toxic element Pb in earthworm may be accompanied by the absorption of other elements. 渭 -SRXRF has great advantages in analyzing the spatial distribution of elements in earthworm samples in situ, and further studies on the morphology of Pb in soil and earthworm have been carried out. It is an important premise to study the detoxification mechanism of earthworms under heavy metal stress.
【作者单位】：中国地质调查局南京地质调查中心;国家地质实验测试中心;中国地质大学(北京);
【基金】：国家自然科学基金项目(Nos.20775018,41201527) 国家高新技术研究发展计划863项目(No.2007AA06Z124) 中国地质调查局地质大调查项目(No.12120113015200) 国家科技专项“汶川地震断裂带科学钻探工程”0008课题和0003课题第四专题的联合资助~~
【分类号】：X835;O657.34
【正文快照】： 1引言近年来,Pb等具有潜在毒性的重金属元素污染问题日益增多,对环境和人类存在极大的生态暴露风险[1]。特别是因矿山开发引起的环境问题,受到了广泛关注[2,3]。随着研究的深入,生物对重金属的耐性机制或解毒机理,引起研究者们广泛关注。杨红霞等[4]用LA-ICP-MS对Cd超富集植物

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