SO42-、NO3-对氯同位素测定的干扰及其消除

摘要

It has been proved that the method of measuring Chlorine isotope which is based on Cs2Cl+ with graphite loading is the best one. But in some experiments we have found that the effects of SO42-and NO3- shouldn’t be neglected. In this paper we study the effects systematically. Some information about the alternation of the instrumental parameters is expressed qualitatively. Meanwhile we explain the causes about the effects. But our major target is to issue the upper limit of SO42-and NO3- under which the effects can be neglected and is to build a method to eliminate the effects of SO42-and NO3-. We hope that this research will instruct our next works.%在石墨存在下用正热电离质谱法测定Cs2Cl+正离子是氯同位素测定的最佳方法，但实验过程中发现，SO42-和NO3-的存在对测定的干扰较严重。在系统地研究了SO42-和NO3-对氯同位素测定影响的基础上，定性地给出了在SO42-和NO3-影响下，部分仪器聚焦参数的变化，并对影响的机理做了一些解释。着重探讨了不产生影响的SO42-和NO3-的最高浓度及SO42-和NO3-的消除方法，以期指导相关的工作。