有机进样–电感耦合等离子体质谱法测定汽油中锰、铁、铅

Determination of manganese,iron and lead in gasoline by organic sampling–inductively coupled plasma mass spectrometry

建立有机进样-电感耦合等离子体质谱法(ICP-MS)测定汽油中锰、铁、铅含量的分析方法。以乙醇为稀释剂,选择水性无机元素标准溶液为标准物质,采用标准加入法并加入内标校正、补偿基体干扰效应后直接稀释进样分析,用碰撞模式消除多原子离子质谱干扰。锰、铁、铅的含量在0.00~20.00 μg/kg范围内具有良好的线性关系,相关系数均大于0.999,检出限分别为0.20,0.50,0.05 μg/kg。按标准加入法进行回收试验,加标回收率分别为81.9%~95.5%,85.4%~103.1%,97.4%~101.4%,测定结果的相对标准偏差均小于6%(n=6)。该方法快速、准确,灵敏度高,操作简便,试剂用量小,能满足实际汽油样品中微量锰、铁、铅含量的分析要求。

An analytical method for determination of manganese,iron and lead in gasoline by organic sampling-inductively coupled plasma mass spectrometry(ICP-MS) was established.Ethanol was used as diluent and water-based inorganic element standard solution was used as standard material.Direct dilution analysis was used after adding internal standard correction and compensating matrix interference effect,and collision mode was used to eliminate polyatomic ion mass spectrometry interference.The contents of manganese,iron,and lead had a good linear relationship in the range of 0.00-20.00 μg/kg,the correlation coefficients were all more than 0.999,and the detection limits of manganese,iron and lead were 0.20,0.50,0.05 μg/kg,respectively.According to the standard addition method,the recovery rates of manganese,iron and lead were 81.9%-95.5%,85.4%-103.1%,97.4%-101.4%,respectively.The relative standard deviation of the results was less than 6%(n=6).This method is rapid,accurate with high sensitivity,simple operation and small amount of reagent used,which can meet the requirements of the analysis of trace manganese,iron and lead content in real gasoline samples.