Efficiences of As uptake from aqueous solution by a natural vivianite material at 4ºC
Efficiences of As uptake from aqueous solution by a natural vivianite material at 4ºC
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DOI：
10.1180/minmag.2008.072.1.429
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发表时间：
2008-02
影响因子：
2.7
通讯作者：
K. Hudson-Edwards;S. Houghton;K. Taylor
中科院分区：
文献类型：
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作者：
K. Hudson-Edwards;S. Houghton;K. Taylor
一些野外和实验室研究表明，针铁矿、纤铁矿和麦基诺石等次生含铁矿物对砷有很强的吸收能力，但对蓝铁矿[Fe 3（PO 4）2·8H2O]吸收砷的能力研究较少。我们在这里报告的实验研究的初步结果，旨在测试天然蓝云母在酸性，近中性和碱性pH值在T = 4°C，这是贝加尔湖类型的环境，其中天然蓝云母报告发生的代表性吸收As（III）和As（V）的效率。蓝铁矿从这些As物质的200 ppb溶液中吸收0至5%的As（III）和21至45%的As（V）。在25°C和其他溶液浓度下的进一步工作，以及吸附后固体的表征，将产生关于天然蓝铁矿吸收As的效率和机制的信息。
Abstract Several field and laboratory studies have demonstrated that secondary Fe-bearing minerals such as goethite, lepidocrocite and mackinawite have a high capacity for the uptake of As, but little work has been carried out to examine the capacity of the mineral vivianite [Fe3(PO4)2·8H2O] for this element. We report here preliminary results of an experimental study designed to test the efficiency of As(III) and As(V) uptake by natural vivianite at acid, near-neutral and alkaline pH at T = 4°C, which is representative of Lake Baikal-type environments, where natural vivianite is reported to occur. The vivianite takes up between 0 and 5% As(III), and between 21 and 45% As(V), from 200 ppb solutions of these As species. Further work at 25°C and other solution concentrations, together with characterization of the post-sorption solids, will yield information on the efficiencies and mechanisms of As uptake by natural vivianite.