Geochemical fates and unusual distribution of arsenic in natural ferromanganese duricrust

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• 作者：Huan Liu ; Xiancai Lu ; ^{xcljun@nju.edu.cn} ; Juan Li ; Xiaoye Chen ; Xiangyu Zhu ; Wanli Xiang ; Rui Zhang ; Xiaolin Wang ; Jianjun Lu ; Rucheng Wang
• 关键词：Ferromanganese duricrust ; Arsenic ; Spatial distribution ; μ-XRF ; EXAFS
• 刊名：Applied Geochemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：76
• 期：Complete
• 页码：74-87
• 全文大小：5480 K
• 卷排序：76

文摘

Unusual arsenic enrichment in manganese oxides in ferromanganese duricrust was revealed by EMPA and μ-XRF mappings. All the arsenic occurs as oxidized state As(V) which adsorbs on Fe/Mn oxides in bidentate binuclear bridging complexes. Extremely high levels of As enrichment has been found in Mn-rich hematite micro-bands. A conceptual model for arsenic attenuation in natural ferromanganese duricrusts has been proposed.