光化学还原偶合沉淀反应无线磁弹性传感器法测定铀(Ⅵ)

Determination of uranium (Ⅵ) using a wireless magnetoelastic sensor based on precipitation reaction coupled with photochemical reduction

发现铀(Ⅵ)在紫外光的照射下可以被异丙醇还原成铀(Ⅳ),而铀(Ⅳ)可以使铁(Ⅲ)与铁氰化钾溶液产生沉淀,产生的沉淀可沉积到磁弹性传感器上使其共振频率发生变化。基于这些发现,建立了无线传感法测定铀(Ⅵ)的新方法。在铁(Ⅲ)、铁氰化钾和硫酸浓度分别为0.01、0.01和0.5 mol/L的条件下,测定铀(Ⅵ)的线性范围为0.12～14.1μg/mL,检出限为0.02μg/mL。应用该方法测定了实际样品中的铀(Ⅵ),回收率为96.7%～104.0%。

It was found that under the UV irradiation,uranium（Ⅵ） can be reduced by isopropyl alcohol to form uranium（Ⅳ）,and uranium（Ⅳ） can induce the precipitation reaction of iron（Ⅲ） with potassium ferricyanide,resulting in the decreasing of resonance frequency of a wireless magnetoelastic sensor on which the precipitation was deposited.Based on these findings,a new wireless sensing method for the determination of uranium（Ⅵ） has been developed.Under the condition of the concentrations of iron（Ⅲ）,potassium ferricyanide and sulphuric acid being 0.01,0.01 and 0.5 mol/L,respectively,the linear range for the determination of uranium（Ⅵ） was 0.12～14.1 μg/mL with the detection limit of 0.02 μg/mL.The proposed method was applied successfully for the determination of uranium（Ⅵ） in water samples with the recoveries of 96.7%～104.0 %.