离子色谱分离-峰面积比值法测定核燃料元件中的钚

建立了用离子色谱法和峰面积比值法分离U并测量核燃料元件中钚的方法。该方法可以消除铀等基体的干扰，色谱条件在一定范围内变化时对测量结果无影响。在一定色谱条件下，通过实验获得相同含量的钚铀峰面积之比后，实际测量时可不采用钚标准溶液对仪器进行校准。方法的检出限为0.05 mg/L。该方法适用于各种乏燃料元件中钚含量的测定。

Determination of Pu in Spent Nuclear Fuel by Ion Chromatographic Separation-Peak Area Ratio Method

An ion chromatographic method for determination of plutonium in spent nuclear fuel is established. In this method uranium and plutonium-containing sample solution is loaded on an anionic exchange resin column and then eluted with 7.2 mol/L HNO₃ for uranium and 0.1 mol/L HNO₃-0.1 mol/L NaF for plutonium. The eluents are mixed on-line with the post column reagent arsines Ⅲ, and the absorbencies are continuously recorded. The plutonium content is calculated from the plutonium-to-uranium peak area ratio. All these operations are implemented and controlled by a chromatographic workstation. By using this method the interference from uranium and other matrix components is eliminated, the plutonium to uranium peak area ratio is quite stable and thus no plutonium reference is needed. The method gives an uncertainty of 2.5% and a detection limit of 0.05 mg/L of plutonium. The successful analysis of two real samples shows the feasibility of this method for determination of plutonium in spent nuclear fuel.