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在 Na_4P_4O_(12)碱性水溶液中,Pr(Ⅲ)可被臭氧氧化,生成棕黄色的 Pr(Ⅳ)—Na_4P_4O_(12)配合物而存在于水溶液中,化学分析和吸收光谱的研究都证明溶液中有镨(Ⅳ)生成,该合物在262nm波长处有一宽带特征吸收峰,摩尔吸光系数ε=1.2×10~3l·mol~(-1)·cm~(-1),Pr(Ⅲ)的氧化受溶液 pH值、温度等条件的影响,实验证明在铈的存在下,用“带同氧化法”可提高 Pr(Ⅲ)的氧化.动力学研究表明 Pr(Ⅳ)在碱性溶液中的还原反应服从拟一级反应动力学方程.还原速率与 pH 值有关
Pr (Ⅲ) can be oxidized by ozone in aqueous solution of Na_4P_4O_ (12) to form a yellowish Pr (Ⅳ) -Na_4P_4O_ (12) complex and exist in aqueous solution. Both chemical analysis and absorption spectra prove that the solution (Ⅳ). The compound has a broad band characteristic absorption peak at 262 nm with a molar absorptivity of ε = 1.2 × 10-3 mol · cm -1, Pr (Ⅲ) The oxidation of Pr (Ⅲ) can be enhanced by “banding oxidation” in the presence of cerium.Kinetic studies show that Pr (Ⅳ) in alkaline solution The reduction reaction obeys the pseudo first-order reaction kinetics equation, and the reduction rate is related to the pH value