KED-ICP-MS法测定电子级丙二醇甲醚中的银、镉和铅

Determination of silver,cadmium and lead in electronic grade propylene glycol methyl ether by inductively coupled plasma mass spectrometry with kinetic energy discrimination

建立了电感耦合等离子体质谱法(ICP-MS)测定电子级丙二醇甲醚中银(Ag)、镉(Cd)和铅(Pb)含量的方法。样品经超纯水稀释后直接进样,采用标准加入法作为定量方法,选择待测同位素为^(107)Ag,^(111)Cd,^(208)Pb,并通过选择检测模式和碰撞/反应池气体流量有效消除质谱干扰。结果表明,在碰撞模式下利用动能歧视技术(KED),He流量为4 mL/min时,质谱干扰消除效果最佳。该方法的线性范围为0.2~5μg/L,线性相关系数大于0.9995,各元素检出限(LODs)为0.002~0.009μg/L,加标回收率为93.8%~104.2%,相对标准偏差(RSDs)小于9.5%。使用KED-ICP-MS法可以准确测定电子级丙二醇甲醚中Ag,Cd和Pb的含量。

A method for the determination of silver(Ag),cadmium(Cd)and lead(Pb)in electronicgrade propylene glycol methyl ether by inductively coupled plasma mass spectrometry with kinetic energy discrimination(KED-ICP-MS)was established.The sample was diluted with ultra-pure water and then injected directly.The quantitative method is the standard addition method.The isotopes to be measured were ^(107)Ag,^(111)Cd,^(208)Pb,and the interference of the mass spectrum was effectively eliminated by selecting the detection mode and the gas flow rate in the collision/reaction cell.When the collision mode was used as the best detection mode,and the He flow of the collision gas was 4 mL/min,the best effect of mass spectrometry interference elimination could be obtained.The linear range of the method was 0.2-5μg/L,the linear correlation coefficients were not less than 0.9995,and the limits of detection(LODs)were in the range of 0.002-0.009μg/L.The spiked recoveries for each element ranged from 93.8%to 104.2%,and the relative standard deviations(RSDs)were less than 9.5%.The contents of Ag,Cd,and Pb in electronic grade propylene glycol methyl ether can be accurately determined by KED-ICP-MS.