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首页> 外文会议>Waste management 2004 symposium (WM'04): waste management, energy security and a clean environment >ESTIMATING SITE CONCENTRATIONS IN SOILS FOR SURFACE COMPLEXATION MODELING OF SORPTION
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ESTIMATING SITE CONCENTRATIONS IN SOILS FOR SURFACE COMPLEXATION MODELING OF SORPTION

机译：估算土壤中的土壤浓度以进行表面复杂化建模

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摘要

MSE Technology Applications,Inc.(MSE),in cooperation with Fluor Hanford,Inc.(FHI)is studying the partitioning of uranium between the soils and groundwater at the 200 West Area of the Hanford Site.The purpose of this effort is to produce an acceptable correlation between predicted and observed concentrations of uranium in the groundwater.The predicted uranium concentrations were derived through geochemical modeling of sorption using a surface complexation approach. rnA surface complexation model often assumes a single,“generic”iron-hydroxide,with average sorption site properties for hydrous ferric oxide(Fe_2O_3•H_2O),to be the primary sorbent.MSE found through citrate-bicarbonate-dithionite(CBD)selective extracts and optical microscopy that the iron-hydroxides in the Hanford soils consist of goethite(αFeO•OH),hematite(Fe_2O_3), and magnetite(Fe_3O_4).These iron species have sorption site properties(surface area and site density)that are significantly different than those of hydrous ferric oxide.MSE has derived a process of estimating sorption site properties for the given soil assemblage using individual sorption characteristics of those three minerals(goethite,hematite,and magnetite).
机译：MSE技术应用公司（MSE）与福陆汉福德公司（FHI）合作，研究汉福德矿址西区200号地区土壤与地下水之间铀的分配。预测的铀浓度与观察到的地下水中铀浓度之间的可接受的相关性。预测铀浓度是通过使用表面络合方法通过吸附的地球化学模型得出的。 rn表面络合模型通常假设单一的“一般”氢氧化铁是主要的吸附剂。水合三氧化二铁（Fe_2O_3•H_2O）的平均吸附位点性质是其主要吸附剂。光学显微镜观察，汉福德土壤中的氢氧化铁由针铁矿（αFeO•OH），赤铁矿（Fe_2O_3）和磁铁矿（Fe_3O_4）组成。这些铁种类的吸附位点性质（表面积和位点密度）明显不同。 MSE通过使用这三种矿物（针铁矿，赤铁矿和磁铁矿）的单独吸附特性，推导了给定土壤组合物的吸附位点特性的估算过程。

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