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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Retardation of iron-cyanide complexes in the soil of a former manufactured gas plant site
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Retardation of iron-cyanide complexes in the soil of a former manufactured gas plant site

机译：在以前的天然气工厂的土壤中对氰化铁配合物的阻滞作用

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摘要

The soil in the vicinities of former Manufactured Gas Plant (MGP) sites is commonly contaminated with iron-cyanide complexes (ferric ferrocyanide). The phenomenon of cyanide mobility in soil, according to the literature, is mainly governed by the dissolution and precipitation of ferric ferrocyanide, which is only slightly soluble (<1mg L-1) under acidic conditions. In this paper, retention properties of the sandy loam soil and the potential vertical movement of the solid iron-cyanide complexes, co-existing with the dissolution, sorption and precipitation reactions were investigated. Preliminary research conducted on a former MGP site implied colloidal transport of ferric ferricyanide from the initial deposition in the wastes layer towards the sandy loam material (secondary accumulation), which possibly retarded the mobility of cyanide (CN). A series of batch and column experiments were applied in order to investigate the retardation of iron-cyanide complexes by the sandy loam soil. Batch experiments revealed that in circumneutral pH conditions sandy loam material decreases the potassium ferro- and ferricyanide concentration. In column experiments a minor reduction in CN concentration was observed prior to addition of iron sulfide (FeS) layer, which induced the formation of the Prussian blue colloids in circumneutral pH conditions. Precipitated solid iron-cyanide complexes were mechanically filtered by the coherent structure of the investigated soil. Additionally, the reduction of the CN concentration of the percolation solutions by the sandy loam soil was presumably induced due to the formation of potassium manganese iron-cyanide (K2Mn[Fe(CN)(6)]).
机译：以前的天然气工厂（MGP）所在地附近的土壤通常被氰化铁络合物（亚铁氰化铁）污染。根据文献，氰化物在土壤中的迁移现象主要受亚铁氰化铁的溶解和沉淀控制，该亚铁氰化物在酸性条件下仅微溶（<1mg L-1）。本文研究了砂壤土的保留特性和固态铁氰化物配合物在溶解，吸附和沉淀反应中共存的潜在垂直运动。在一个以前的MGP站点上进行的初步研究表明，铁氰化铁从废物层中的最初沉积物向砂质壤土材料（二次积累）的胶体迁移可能会阻碍氰化物（CN）的迁移。为了研究砂壤土对铁氰化物络合物的阻滞作用，进行了一系列的分批和柱试验。批处理实验表明，在pH中性条件下，沙质壤土材料会降低铁氰化钾和铁氰化钾的浓度。在柱实验中，在添加硫化铁（FeS）层之前观察到CN浓度略有降低，这在环境pH值条件下诱导了普鲁士蓝胶体的形成。沉淀的固态氰化铁固体通过研究土壤的相干结构进行机械过滤。另外，推测是由于形成了钾锰铁氰化物（K 2 Mn [Fe（CN）（6）]），导致沙壤土渗滤溶液中CN浓度降低。

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