Cr Release from Cr-Substituted Goethite during Aqueous Fe(II)-Induced Recrystallization | |
Jian Hu; Manjia Chen; Chengshuai Liu; Fangbai Li; Jian Long; Ting Gao; Fei Wu; Jing Lei; Minghua Gu | |
2018 | |
发表期刊 | Minerals
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卷号 | 8期号:9页码:1-16 |
摘要 | The interaction between aqueous Fe(II) (Fe(II)(aq)) and iron minerals is an important reaction of the iron cycle, and it plays a critical role in impacting the environmental behavior of heavy metals in soils. Metal substitution into iron (hydr)oxides has been reported to reduce Fe atom exchange rates between Fe(II)(aq) and metal-substituted iron (hydr)oxides and inhibit the recrystallization of iron (hydr)oxides. However, the environmental behaviors of the substituted metal during these processes remain unclear. In this study, Fe(II)(aq)-induced recrystallization of Cr-substituted goethite (Cr-goethite) was investigated, along with the sequential release behavior of substituted Cr(III). Results from a stable Fe isotopic tracer and Mossbauer characterization studies show that Fe atom exchange occurred between Fe(II)(aq) and structural Fe(III) (Fe(III)(oxide)) in Cr-goethites, during which the Cr-goethites were recrystallized. The Cr substitution inhibited the rates of Fe atom exchange and Cr-goethite recrystallization. During the recrystallization of Cr-goethites induced by Fe(II)(aq), Cr(III) was released from Cr-goethite. In addition, Cr-goethites with a higher level of Cr-substituted content released more Cr(III). The highest Fe atom exchange rate and the highest amount of released Cr(III) were observed at a pH of 7.5. Under reaction conditions involving a lower pH of 5.5 or a higher pH of 8.5, there were substantially lower rates of Fe atom exchange and Cr(III) release. This trend of Cr(III) release was similar with changes in Fe atom exchange, suggesting that Cr(III) release is driven by Fe atom exchange. The release and reincorporation of Cr(III) occurred simultaneously during the Fe(II)(aq)-induced recrystallization of Cr-goethites, especially during the late stage of the observed reactions. Our findings emphasize an important role for Fe(II)(aq)-induced recrystallization of iron minerals in changing soil metal characteristics, which is critical for the evaluation of soil metal activities, especially those in Fe-rich soils. |
关键词 | Trace Metal Release Iron Mineral Fe Atom Exchange Phase Transformation Soil Metal Activity |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/8917 |
专题 | 环境地球化学国家重点实验室 |
作者单位 | 1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China 2.Guangdong Key Laboratory of Integrated Agro-Environmental Pollution Control and Management, Guangdong Institute of Eco-Environmental Science & Technology, Guangzhou 510650, China 3.School of Geography & Environmental Science, Guizhou Normal University, Guiyang 550001, China 4.College of Agriculture, Guangxi University, Nanning 530005, China |
推荐引用方式 GB/T 7714 | Jian Hu;Manjia Chen;Chengshuai Liu;Fangbai Li;Jian Long;Ting Gao;Fei Wu;Jing Lei;Minghua Gu. Cr Release from Cr-Substituted Goethite during Aqueous Fe(II)-Induced Recrystallization[J]. Minerals,2018,8(9):1-16. |
APA | Jian Hu;Manjia Chen;Chengshuai Liu;Fangbai Li;Jian Long;Ting Gao;Fei Wu;Jing Lei;Minghua Gu.(2018).Cr Release from Cr-Substituted Goethite during Aqueous Fe(II)-Induced Recrystallization.Minerals,8(9),1-16. |
MLA | Jian Hu;Manjia Chen;Chengshuai Liu;Fangbai Li;Jian Long;Ting Gao;Fei Wu;Jing Lei;Minghua Gu."Cr Release from Cr-Substituted Goethite during Aqueous Fe(II)-Induced Recrystallization".Minerals 8.9(2018):1-16. |
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