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首页> 外文期刊>Environmental Science & Technology >Abiotic Transformation of Hexahydro-1,3,5-trinitro-1,3,5-triazine by Fe{sup}(II) Bound to Magnetite
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Abiotic Transformation of Hexahydro-1,3,5-trinitro-1,3,5-triazine by Fe{sup}(II) Bound to Magnetite

机译：Fe {sup}（II）结合到磁铁矿对六水-1,3,5-三硝基-1,3,5-三嗪的非生物转化

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摘要

RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), a nitramine explosive, is often found as a subsurface contaminant at military installations. Though biological transformations of RDX are often reported, abiotic studies in a defined medium are uncommon. The work reported here was initiated to investigate the transformation of RDX by ferrous iron (Fe{sup}(II)) associated with a mineral surface. RDX is transformed by Fe{sup}(II) in aqueous suspensions of magnetite (Fe{sub}3O{sub}4). Negligible transformation of RDX occurred when it was exposed to Fe{sup}(II) or magnetite alone. The sequential nitroso reduction products (MNX, DNX, and TNX) were observed as intermediates. (NH{sub}4){sup}+, N{sub}2O, and HCHO were stable products of the transformation. Experiments with radiolabeled RDX indicate that 90% of the carbon end products remained in solution and that negligible mineralization occurred. Rates of RDX transformation measured for a range of initial Fe{sup}(II) concentrations and solution pH values indicate that greater amounts of adsorbed Fe{sup}(II) result in fastertransformation rates. As pH increases, more Fe{sup}(II) adsorbs and k{sub}(obs) increases. The degradation of RDX by Fe{sup}(II-) magnetite suspensions indicates a possible remedial option that could be employed in natural and engineered environments where iron oxides are abundant and ferrous iron is present.
机译：RDX（六氢-1,3,5-三硝基-1,3,5-三嗪）是一种硝胺炸药，在军事设施中经常被发现为地下污染物。尽管经常报道了RDX的生物转化，但在定义的培养基中进行非生物研究并不常见。此处报告的工作是为了研究与矿物表面有关的亚铁（Fe {sup}（II））对RDX的转化而启动的。 RDX通过Fe {sup}（II）在磁铁矿（Fe {sub} 3O {sub} 4）的水悬浮液中转化。当RDX暴露于Fe {sup}（II）或单独的磁铁矿时，发生的转化可忽略不计。观察到连续的亚硝基还原产物（MNX，DNX和TNX）为中间体。 （NH {sub} 4）{sup} +，N {sub} 2O和HCHO是该转化的稳定产物。用放射性标记的RDX进行的实验表明，有90％的碳终产物保留在溶液中，并且可忽略的矿化发生。在一定范围的初始Fe {sup}（II）浓度和溶液pH值下测得的RDX转化速率表明，吸附的Fe {sup}（II）的吸附量越大，转化速率越快。随着pH值的增加，更多的Fe {sup}（II）会被吸附，而k {sub}（obs）会增加。 Fe {sup}（II-）磁铁矿悬浮液对RDX的降解表明可能的补救方案，该方案可用于氧化铁丰富且存在二价铁的自然和工程环境中。

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