Based on the removal of interference by mass-transfer reaction in the H2 reaction mode,an analytical method for determining trace Cl in light oil by inductively coupled plasma tandem mass spectrometry(ICP-MS/MS)was established.The light oil samples were directly determined by ICP-MS/MS after simple dilution.In the MS/MS mode,using H2 as the reaction gas,the product ion H2Cl+formed by the secondary H-atom transfer reaction between Cl+and H2 in the collision/reaction cell(CRC)was used for determination.In the case of eliminating all the spectral interference,the Cl sensitivity and the limit of detection(LOD)were obviously better than those in O2 reaction mode,and the LOD was as low as 7.56 μg/kg.The accuracy and reliability of the method were evaluated through comparative analysis of the standard reference material NIST SRM 1634c by use of the sector field ICP-MS(SF-ICP-MS).The results reveal that the analysis results of the standard reference materials are basically consistent with the certified values,and the relative standard deviation(RSD)is between 3.1％and 4.7％.There is no significant difference between the results of two methods at the 95％confidence level.The developed analytical method has high sensitivity,accuracy and precision.The combination of MS/MS mode and H2 mass-transfer method allows for the interference-free determination of Cl,which is suitable for the quality evaluation and control of trace Cl in light oil.
关键词
轻质油/电感耦合等离子体串联质谱/Cl/碰撞/反应池/H原子转移
Key words
light oil/inductively coupled plasma tandem mass spectrometry/Cl/collision/reaction cell/H-atom transfer
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