Abstract: 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.

Key words: Microwave coupled plasma , Atomic emission spectrometry , Gasoline , Copper , Iron

摘要： 用微波等离子体炬(MPT)为激发光源,氩气为等离子体工作气体,用气动雾化进样,研究了微波等离
子体炬原子发射光谱法(MPT-AES)测定汽油中铜和铁的方法。考察了微波功率、载气流量、工作气流量、氧屏蔽
气流量等实验参数对测定铜和铁的影响。实验结果表明,本方法测定铜和铁的检出限分别为5.3和22.1μg/L,方法
的精密度均小于2.83%,线性范围分别为0.05~60mg/L和0.1~100mg/L,样品测定的加标回收率均在95.1%~
103.5%之间。本方法具有灵敏度高,样品用量少,维持费用低,结果准确,分析速度快等特点。

关键词: 微波等离子体炬 , 原子发射光谱法 , 汽油 ,  铜 , 铁