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	Enrichment of trace elements in ferromanganese concretions from terra rossa and their potential desorption
	Feng, Jin-Liang; Lin, Yong-Chong; Gao, Shao-Peng; Zhang, Ji-Feng
通讯作者	Feng, JL (通讯作者)
发表日期	2012
ISSN	0016-7002
EISSN	1880-5973
起始页码	151
结束页码	161
卷号	46 期号:2
英文摘要	The distributions of trace elements in ferromanganese concretions (FMCs) and the surrounding terra rossa (TR) matrix overlying dolomite have been examined to extend our understanding of their mobilization, redistribution and fractionation during karst weathering and pedogenesis. This study demonstrates that the characteristics of trace elements in TR have been severely overprinted by weathering and pedogenetic processes. The composition of trace elements in FMCs within TR soil profiles varies greatly with depth. The concentrations of Be, Ni, Cu, Zn, As and Bi in FMCs fluctuate and tend to increase with depth; other trace element concentrations fluctuate in the profile but show no clear trend. The toxic elements Cr, As, Cd, Tl and Pb, as well as Co, are significantly enriched in FMCs relative to the surrounding TR matrix: arsenic exhibits strong affinity with Fe, but Cr and Cd contents are not significantly correlated with either Mn or Fe. Correspondingly, Co, Tl and Pb are related to the Mn in FMCs rather than the Fe. In FMCs, trace element distribution and partitioning in the Mn-Fe phases are governed by the location-specific formational pedoenvironment, with the weathering front etching downwards. Experiments with simulated acid rain indicate that desorption of elements from FMCs is generally pH-dependent regardless of the variation of the released amounts and their desorbztbility. Moreover, it seems that toxic elements bonded to Mn-phase were easily desorbed from FMCs. As a result, the bioavailability, mobility and activity of some toxic elements in FMCs and TR are potentially increased in field areas experiencing severe soil erosion and acid rain.
关键词	IRON-MANGANESE CONCRETIONS YUNNAN-GUIZHOU PLATEAU FE-MN NODULES ACID-RAIN OVERLYING DOLOMITE MINOR ELEMENTS HEAVY-METALS RARE-EARTH SOILS GEOCHEMISTRY
英文关键词	dolomite; karst weathering; terra rossa; ferromanganese concretions; simulated acid rain; toxic element desorption
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000303905100007
来源期刊	GEOCHEMICAL JOURNAL
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258020
推荐引用方式 GB/T 7714	Feng, Jin-Liang,Lin, Yong-Chong,Gao, Shao-Peng,et al. Enrichment of trace elements in ferromanganese concretions from terra rossa and their potential desorption[J]. 中国科学院青藏高原研究所,2012,46(2).
APA	Feng, Jin-Liang,Lin, Yong-Chong,Gao, Shao-Peng,&Zhang, Ji-Feng.(2012).Enrichment of trace elements in ferromanganese concretions from terra rossa and their potential desorption.GEOCHEMICAL JOURNAL,46(2).
MLA	Feng, Jin-Liang,et al."Enrichment of trace elements in ferromanganese concretions from terra rossa and their potential desorption".GEOCHEMICAL JOURNAL 46.2(2012).