A method for the determination of trace copper and iron in gasoline by microwave plasma torch- atomic emission spectrometry （MFT-AES） with microwave digestion for sample pretreatment was developed. Comprehensive experimental parameters for MPT- AES, including microwave power, carrier gas flow rate, support gas flow rate, acidity and coexistence ions, and for microwave digestion, including acid type, digestion temperature, digestion time and microwave power were optimized. The detection limit and linear dynamic range for copper were 2.1 ng/mL and 0.01 - 12 μg/mL, respectively ; and those for iron were 22. 1 ng/mL and 0. 1 - 100μg/mL, respectively. The recoveries of copper and iron were 93% - 107% and 92% - 106% , respectively, and their RSD were less than 3.5%. Compared with the traditional iodine -xylene -nitric acid stripping method, microwave digestion is an environmental friendly method in digesting the gasoline sample.
Journal of Instrumental Analysis
Microwave plasma torch atomic emission spectrometry