电感耦合等离子体发射光谱法(ICP-AES)直接测定航空汽油中锰含量

Determination of manganese in aviation gasoline with directly sample injecting by ICP-AES

建立了电感耦合等离子体发射光谱法(ICP-AES)直接进样测定航空汽油中锰元素的分析方法,优化了仪器工作参数,并对该方法进行了评价。优化后的方法采用有机进样系统,在-4℃下直接进样后雾化,同时以25 mL/min的速率通入氧气,再用标准加入法进行定量分析。仪器的射频功率1500 W、雾化器流量0. 40 L/min。回归方程相关系数达到0. 9999,检出限0. 782 mg/kg,相对标准偏差0. 89%～1. 7%,回收率达97. 3%～103. 4%。

The method of using methyl cyclopentadiene tricarbonyl manganese( MMT) instead of tetraethyl lead to improve the octane number of aviation gasoline was favored by researchers. A directly sample injecting analysis method of manganese in aviation gasoline by ICP-AES was established. The working parameters of instrument were optimized and the method was evaluated. The optimum method was as follows: leading the samples directly into the nebulizer through an organic sample system under25 m L/min oxygen at-4 ℃,and calculating the results with standard-addition method by ICP-AES.The optimum working parameters of instrument were as follows: radio-frequency power 1500 W and atomizer flow 0. 40 L/min. The correlation coefficient of linear regression equations was 0. 9999,the detection limit was 0. 782 mg/kg,the relative standard deviations were 0. 89%-1. 7% and the recoveries of standard addition were 97. 3%-103. 4%.