DETERMINATION OF NO_2~-IN HNO_3-H_2C_2O_4 MIXTURE SOLUTION WITH RIVANOL METHOD

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 % .