蒸气发生-原子吸收光谱法测定催化剂中痕量钯

Vapor Generation-AAS Determination of Trace Amounts of Palladium in Catalysts

摘要: 提出了蒸气发生-原子吸收光谱法测定催化剂中钯含量的方法.探讨了二乙胺基二硫代甲酸钠(DDTC)对钯蒸气态物质生成效率的增强作用及钯蒸气态物质的生成机理.在优化的试验条件下,钯的质量浓度与其吸光度在0.05~0.80 mg·L-1范围内呈线性,方法的检出限(3s/k)为1.8 μg·L-1.方法应用于催化剂中钯的测定,测得回收率为91.0%~104.0%.

Abstract: A method for the determination of palladium by vapor generation-AAS (VG-AAS)was proposed.The enhancement of generating efficiency of the volatile species of palladium by the addition of DDTC and its reaction mechanism were discussed.Under the optimum experimental conditions,linear relationship between values of absorbance and mass concentration of palladium obtained was in the range of 0.05-0.80 mg·L-1,with detection limits (3s/k) of 1.8 μg·L-1.The proposed method was applied to the determination of palladium in catalysts,giving values of recovery in the range of 91.0%-104.0%.