Arsenic in hydrothermal apatite: Oxidation state, mechanism of uptake, and comparison between experiments and nature

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• 作者：Weihua Liu^a ; ^{weihua.liu@csiro.au} ; Yuan Mei^a ; ^b ; Barbara Etschmann^b ; Joë ; l Brugger^b ; Mark Pearce^a ; Chris G. Ryan^a ; Stacey Borg^a ; Jeremey Wykes^c ; Peter Kappen^c ; David Paterson^c ; Ulrike Boesenberg^d ; Jan Garrevoet^d ; Gareth Moorhead^a ; Gerald Falkenberg^d
• 关键词：Apatite ; Arsenic ; Oxidation state ; Mineral replacement reaction ; XANES spectroscopy ; Molecular simulations ; Trace element partitioning
• 刊名：Geochimica et Cosmochimica Acta
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：196
• 期：Complete
• 页码：144-159
• 全文大小：3288 K
• 卷排序：196

文摘

As(III) and As(V) both can be incorporated in hydroxylapatite during dynamic coupled dissolution/reprecipitation reactions. As(III) moieties replace phosphate groups with a high local strain compared to As(V). Upon recrystallization, As(V) replaces the As(III) in the hydroxylapatite structure. Most studied natural hydrothermal apatites retain mainly As(V), even though they formed from solutions that mainly contained As(III). Reaction pathway and kinetics exert a major controls on As(III) uptake in hydrothermal apatite.