Np在北山花岗岩裂隙填充物上的吸附行为

Sorption of Np(Ⅴ) on Beishan Granite Fracture Filling Materials

摘要: 采用批式实验法在低氧条件下研究Np(Ⅴ)在北山花岗岩裂隙填充物上的吸附行为，探讨地下水pH、CO₃^2-、腐殖酸及裂隙填充物各组分等因素对吸附的影响。实验结果表明：裂隙填充物对Np(Ⅴ)有较强的吸附能力，吸附分配比K_d为843 mL/g；K_d随pH先增大后减小，当有CO₃^2-和腐殖酸存在时K_d减小；绿泥石和长石是北山花岗岩裂隙填充物吸附Np(Ⅴ)的主要贡献者。

Abstract: The sorption behaviors of Np(Ⅴ) on the granite fracture filling materials were studied by batch experiments under anaerobic in Beishan groundwater. The impact of pH of groundwater, CO₃^2-, humic acid and different components of granite fracture filling materials on sorption of Np(Ⅴ) was investigated. The results show that the granite fracture filling materials have strong capacity of Np(Ⅴ) adsorption. The value of K_d for Np(Ⅴ) sorption on the granite fracture filling materials is 843 mL/g. With the increase of pH, the value of K_d increases at first and then decreases. K_d of Np sorption on granite fracture filling materials in the presence of CO₃^2- and humic acid decreases. The chlorite and feldspar are major contributors to the sorption of Np(Ⅴ) on Beishan granite fracture filling materials.

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