激光切除ICP-MS协议用于对珊瑚的高分辨率与比率 (I/Ca) 分析
Ashley N Prow-Fleischer1, Zunli Lu1
1Department of Earth and Environmental Sciences, Syracuse University, Syracuse, New York, USA.
Rapid communications in mass spectrometry : RCM
|February 9, 2025
概括
一种新的激光除方法提供了高分辨率的珊瑚- (I / Ca) 分析,这对于了解过去的海洋氧气水平至关重要. 这种技术改进了传统方法,从珊瑚档案中提供了更详细的气候记录.
科学领域:
- 地质化学 地质化学
- 古气候学 古气候学
- 海洋科学 海洋科学
背景情况:
- 珊瑚是过去海水地化学的宝贵档案,将气候记录扩展到直接监测之外.
- 珊瑚中的与 (I/Ca) 比率是局部氧气耗尽的潜在代理.
- 现有的基于溶液的ICP-MS方法用于I/Ca分析,仅限于采样分辨率.
研究的目的:
- 开发和验证用于高分辨率珊瑚I/Ca分析的快速激光剥离感应合等离子体质谱 (LA-ICP-MS) 协议.
- 为了优化激光参数,在珊瑚中进行准确和可重复的I/Ca测量.
- 评估LA-ICP-MS在重建过去环境条件方面的潜力.
主要方法:
- 两个参考材料 (JCp-1和MACS-3) 的精度比较,用于微量元素分析 (Sr,Mg,I,Ba,U).
- 评估了激光参数 (点大小,流动性,重复率,扫描速度) 对敏感性的影响.
- 沿着和横跨珊瑚的线扫描,以高分辨率测量I/Ca.
主要成果:
- 与MACS-3相比,JCp-1参考材料在和微量元素测量方面显示出更高的精度.
- 优化的激光设置和相邻的平均过使得在分辨率<100微米时能够进行准确的I/Ca分析.
- 微小的I / Ca变化可能反映了生物矿物化,而大规模的特征则沿着珊瑚轴相关.
结论:
- LA-ICP-MS是一种有前途的技术,用于准确的,高分辨率的珊瑚I/Ca分析.
- JCp-1 是该方法的合适校准标准.
- 对于可靠的I/Ca数据来说,对相对于珊瑚骨元素的激光横断的仔细对齐至关重要.
更多相关视频
相关概念视频
Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview
611
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...
611
Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle
495
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...
495
Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences
366
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...
366


