Citation: YUAN Jing, LUO Li-Qiang. Distribution Analysis of K, Ca, Cu, Zn and Pb in Earthworm by In Situ Synchrotron Radiation Micro X-Ray Fluorescence[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(5): 792-798. doi: 10.11895/j.issn.0253-3820.150801 shu

Distribution Analysis of K, Ca, Cu, Zn and Pb in Earthworm by In Situ Synchrotron Radiation Micro X-Ray Fluorescence

YUAN Jing ^1,2,3, ,
LUO Li-Qiang ^2,3

1.
Nanjing Center of Geological Survey, China Geological Survey, Nanjing 210016, China;
2.
National Research Center for Geoanalysis, Beijing 100037, China;
3.
China University of Geosciences, Beijing 100083, China

Received Date: 12 October 2015
Revised Date: 25 January 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 20775018, 41201527) and the National High Technology Research and Development Program of China (No. 2007AA06Z124)

To study the accumulation and storage mechanism of heavy metals in earthworms, synchrotron radiation micro X-ray fluorescence (μ-SRXRF) was used to determine element distribution characteristics of K, Ca, Cu, Zn and Pb in earthworms living in garden around Qixiashan lead-zinc mine of Nanjing. The imaging of these elements showed that Pb primarily accumulated in the region around the posterior alimentary canal. There were also Zn and Cu signals in the anterior and posterior part of earthworm, besides the distribution characters of Zn and Cu in the posterior part of earthworm were the same as that of Pb. The findings indicated that the distribution characters in the region around the posterior alimentary canal was a special accumulation and storage mechanism in earthworms for cutting the threat of toxic heavy metals. The high relationship between Pb and Zn distribution indicated that the two elements had a very similar pathway. In this study, we proved that μ-SRXRF had a great advantage in spatial distribution analysis of elements in earthworm samples. A further research focusing on Pb speciation in soil and earthworms is needed for understanding the detoxification mechanism in earthworms under heavy metal stress.
- Synchrotron radiation micro X-ray fluorescence,
- Earthworm,
- In situ analysis,
- Lead,
- Storage mechanism
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