Determination of Copper and Iron in Gasoline by MPT-AES

Microwave plasma torch is used as exaction power,and Argon is used as work gas.Contents of copper and iron in gasoline were determined by microwave plasma torch atomic emission spectrometry(MPT-AES) with pneumatic nebulization sample introduction system.The influence of microwave power,support gas flow rate,work gas flow rate,oxygen shielded gas on the contents of copper and iron were discussed and optimized.The experimental results show that the detection limits of copper and iron are 5.3 and 22.1 μg/L respectively;RSD of the method is less than 2.83%;the linear ranges of copper and iron are 0.05～60 and 0.1～100 mg/L respectively;the recoveries of sample are in the range of 95.1%～103.5%.The method has many features,such as high sensitivity,rapidity,less sample quantity,low maintenance cost and accurate.