Laser Ablation ICP Atomic Emission Spectrometry (LA-ICP-AES) for in situ microanalysis

用于原位微量分析的激光烧蚀 ICP 原子发射光谱法 (LA-ICP-AES)

• 批准号: 464364655
• 金额: --
• 依托单位: Christian-Albrechts-Universität zu Kiel
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/464364655?language=en
• 关键词: Laser; Ablation; ICP; Atomic; Emission

Trace element distributions in biogenic materials such as corals, mussel shells and (micro)fossils provide important information on the environmental conditions that prevailed during their growth. With spatially resolved measurements, these chemical archives can be deciphered and chronologically classified. This requires powerful microanalysis methods for direct measurements on the skeletal hard parts. The coupling of a powerful laser ablation system (LA) with a real-simultaneous ICP-AES spectrometer designed for transient measurements to form the new technology "LA-ICP-AES" is innovative and has enormous potential that has not yet been fully exploited: the real-simultaneous measurement of an AES spectrometer leads, as with multi-collector MS, to far lower measurement uncertainties of elemental conditions than is possible with sequential data acquisition as with LA-ICP-MS. The recent development of novel ablation cells with significantly shorter washout times of the sample aerosol generated by the laser leads to significantly increased signals in the connected spectrometer and thus to significantly improved counting statistics with resulting lower measurement uncertainties. This enables high-precision measurements directly on the skeletal hard parts, and the extremely time-consuming and labour-intensive sample preparation, can be omitted (for example, the use of corals as geochemical archives requires the drilling of sample material with a micro drill, dissolving of the powder in acid, producing measurement dilutions). The LA-ICP-MS results in a many times higher sample throughput, which is urgently needed for a more comprehensive evaluation of as many such archives as possible. A mass spectrometer (ICP-MS, ICP-MS/MS) connected in parallel in laser ablation split stream (LASS) mode will later allow the simultaneous acquisition of trace element contents or isotope ratios.

珊瑚、贻贝壳和（微）化石等生物材料中的微量元素分布提供了有关其生长过程中普遍存在的环境条件的重要信息。通过空间分辨测量，这些化学档案可以被破译并按时间顺序分类。这需要强大的微分析方法来直接测量骨骼硬部件。将强大的激光烧蚀系统 (LA) 与专为瞬态测量而设计的实时同步 ICP-AES 光谱仪相结合，形成新技术“LA-ICP-AES”，具有创新性，并且具有尚未充分开发的巨大潜力：与多接收器 MS 一样，AES 光谱仪的实时同步测量比 LA-ICP-MS 等连续数据采集的元素条件测量不确定度要低得多。最近开发的新型消融单元显着缩短了激光产生的样品气溶胶的冲洗时间，从而显着增加了连接的光谱仪中的信号，从而显着改善了计数统计数据，从而降低了测量不确定性。这使得能够直接在骨骼坚硬部分上进行高精度测量，并且可以省略极其耗时和劳动密集型的样品制备（例如，使用珊瑚作为地球化学档案需要使用微型钻头对样品材料进行钻孔） ，将粉末溶解在酸中，产生测量稀释液）。 LA-ICP-MS 的样品通量提高了很多倍，这是对尽可能多的此类档案进行更全面评估所迫切需要的。以激光烧蚀分流 (LASS) 模式并联的质谱仪（ICP-MS、ICP-MS/MS）稍后将允许同时采集痕量元素含量或同位素比率。