利凡诺法测定HNO_3-H_2C_2O_4混合液中的NO_2~-
DETERMINATION OF NO_2~-IN HNO_3-H_2C_2O_4 MIXTURE SOLUTION WITH RIVANOL METHOD
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摘要: 用利凡诺 (Rivanol)法研究并测定了 HNO3 氧化去除 TRPO流程 Np、Pu反萃液中 H2 C2 O4 时产生的 NO-2 。实验在 0 48mol L HCl介质中 ,利用 Rivanol溶液与 NO-2 生成樱红色配合物性质 ,用分光光度法测定。结果表明 ,质量比 R(NO-3 NO-2 )≤ 3 6× 1 0 4和 R(C2 O2 -4 NO-2 )≤ 4× 1 0 3时 ,均对 NO-2 的测定无影响。方法对 NO-2 的检测下限为 0 0 2 mg L,相对标准偏差为 3% ,重加回收率为 97%~ 1 0 5%。Abstract: The determination of NO-2 ,resulted from the HNO3 oxidation of H2 C2 O4 in Np Pu strip ping solution,is studied using Rivanolmethod.The cherry red complex resulted from reac tion of Rivanol reagent with NO-2 ion is determinated with spectrophotometry in 0 .4 8mol L HClsolution.The determination of NO-2 isnotinfluenced by the mass ratio R undertheconditionsof R(NO-3 NO-2 )≤ 3 .6× 10 -4and R(C2 O2 -4 NO-2 )≤ 4 .0× 10 3 .Thede tection limitof NO-2 is0 .0 2 mg L,theprecision ofthemethod is3 % ,the recovery ofadded standard sampleis97%~ 10 5 % .