使用热电离质谱法 (TIMS) 与连续加热方法相结合,在超微距水平上对的同位素分析:数据集成范围和方法的优化
Yang-Soon Park1, Kyoung-Seok Lee2, Jean Sun Lim2
1Radioactive Material Chemical Analysis Section, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.
Journal of the American Society for Mass Spectrometry
|December 7, 2023
概括
这项研究优化了使用热电离质谱法 (TIMS) 进行超追踪 (Pb) 同位素分析的数据整合方法. 具有特定整合范围的方法I提供了准确的Pb同位素比率,对于精确的地质和环境研究至关重要.
科学领域:
- 地质化学 地质化学
- 分析化学 分析化学
- 环境科学 环境科学
背景情况:
- 精确的同位素分析 (Pb) 在超级追踪水平对于各种科学学科至关重要.
- 连续加热的热电离质谱 (TIMS) 是此类分析的关键技术.
- 评估数据整合方法对于提高超追踪Pb同位素测量的可靠性至关重要.
研究的目的:
- 系统地评估和比较使用TIMS进行超追踪Pb同位素分析的不同数据整合方法.
- 确定最佳的集成范围和计算方法,以准确确定Pb同位素比率.
- 验证优化的方法,以提高超追踪Pb同位素分析的准确性和精度.
主要方法:
- 使用经过认证的Pb参考材料 (SRM 981) 对三种数据计算方法 (I,II,III) 和各种整合范围 (完全,超过1%,25%,75%) 的实验性评估.
- 方法I涉及将离子信号强度和质量分数补偿相加.
- 方法II使用预先计算的平均同位素比率,方法III使用加权平均值.
主要成果:
- 方法I证明了所有整合范围内的10和1 ng样本与认证值的一致性.
- 对于100ppg的样本,I方法中的减少的整合范围 (超过1%,25%,75%) 产生了与认证值重叠的结果,而不是全范围.
- 方法II显示性能较差,而方法III适用于单次测量,但采用了优化范围的方法I.
结论:
- 建议使用TIMS进行超追踪Pb同位素分析,其整合范围超过1%或25%,以排除异常,同时补偿质量分离.
- 方法I,具有适当的整合范围,为超追踪Pb同位素分析提供了更高的准确性和精度.
- 经过验证的优化方法为该领域的研究人员提供了宝贵的见解.
相关概念视频
01:13Mass Spectrometry: Isotope Effect
2.1K
Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the difference between the molecular mass. Furthermore, the intensity of these signals is dependent on the...
2.1K
01:19Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview
749
In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
749
01:29Atomic Emission Spectroscopy: Lab
167
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
167
01:20Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences
485
Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
485
01:19Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle
636
Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
636