Determination of Copper, Iron, Nickel, Sodium in Catalyst by Microwave Digestion-Atomic Absorption Spectrometry

Catalyst samples were digested in a microwave digestion system.Orthogonal design of 4 factors(temperature,time,power,and amount of acid) at 2 levels and distinct analysis experiment were applied for microwave digestion condition.The optimum parameters for microwave digestion were determined in the end.As a result,a simple,cost-effective,time-effective and environment-friendly method,microwave-AAS,for the determination of copper,iron,nickel,sodium in catalyst was obtained,respectively.The relative standard deviation(n=5) is less than 2.3% for copper,2.9% for iron,2.0% for nickel and 2.3% for sodium,respectively.The recovery is 95.9%～104.7% for copper,96.1%～104.1% for iron,97.0%～103.8% for nickel and 96.5%~104.6% for sodium,respectively.The relative standard deviation and recovery are better than conventional methods.