全蒸发技术在热电离质谱法中的应用研究
2021-01-15朱晓斌
朱晓斌


摘要:全蒸发技术作为新形势下备受关注的一种技术,其在热电离质谱法中应用便延伸出了全蒸发热电离质谱法,简称TE-TIMS,这种方法相对于传统的全蒸发技术无需标准物质进行校正,即可提高热电离过程当中同类元素的精准性,同时具有操作简单、可重复性较高的优点,该技术在环境计量学等领域获得了广泛的应用。基于此种状况,本文以全蒸发技术在热电离质谱法中的应用为切入点,浅谈全蒸发-热电离质谱法的关键要点,并对其未来发展提出展望。
关键词:全蒸发技术 热电离质谱法应用 研究
Abstract: As a technology that has attracted much attention under the new situation, the application of pervaporation technology in thermal ionization mass spectrometry extends the pervaporation thermal ionization mass spectrometry, referred to as TE-TIMS. Compared with the traditional pervaporation technology, this method can improve the accuracy of similar elements in the process of thermal ionization without calibration of reference materials. At the same time,it has the advantages of simple operation and high repeatability.This technology has been widely used in environmental metrology and other fields. Based on this situation, taking the application of pervaporation technology in thermal ionization mass spectrometry as the starting point, this paper discusses the key points of pervaporation thermal ionization mass spectrometry, and puts forward the prospect of its future development.
Key Words: Pervaporation technology;Thermal ionization mass spectrometry; Application; Research
在国际上,热电离质谱法是同位素丰度分析最为精密、最为准确的依据之一,在TIMS法分析之中,能够使得待测元素在一定熔点的背景之下发生蒸发电离,离子经过分离之后进入检测室获得同位素丰度比值,在这过程当中由于每种同位元素的质量和蒸发率有所不同,所以使得前期轻质量的同位素比重偏重。由此,必须要引入全蒸发方法,此种方法能较为准确的为同位素的测量获得精准的结果,在测量当中不需要对标准物质进行校正,以此避免产生分馏效应,由此其在热电离质谱法中得到了广泛的关注[1-2]。
1.实验部分
1.1热电离质谱法
热电离质谱法在運用过程当中通常会伴随着显著的同位素分馏效应,Langmuir蒸发速率的公式如下,
dn/dt=P_s√2πmRT
其中dn/dt表示蒸发速度,Ps表示元素的饱和蒸气压,m是元素的相对原子质量,R表示理想气体的常数。根……
