气相中的LAMIS:通过CaF分子形成获得Ca元素和同位素信息的新方法
Flávio V Nakadi1, Alicia Garcia-Garcia1, Ana Rua-Ibarz1
1University of Zaragoza, Department of Analytical Chemistry, Aragon Institute of Engineering Research (I3A), Zaragoza, 50009, Spain.
Talanta
|March 17, 2025
概括
本研究提出了一种使用激光诱导分解光谱 (LIBS) 分析的新方法,通过形成单化 (CaF) 分子. 该技术可以准确地确定水和牛奶等实物样本中的度和同位素组成.
科学领域:
- 分析化学 分析化学
- 频谱学是一种光谱学.
- 材料科学 材料科学 材料科学
背景情况:
- 激光诱导分解光谱 (LIBS) 是一种强大的元素分析技术.
- 分子LIBS为同位素分析提供了潜力,但在分子形成和量化方面仍然存在挑战.
- 一化物 (CaF) 是特定分析应用的目标分子.
研究的目的:
- 为LIBS和LAMIS开发和验证一种用于在血羽毛中生成CaF分子的新方法.
- 评估开发的元素和同位素测定方法的定量能力.
- 将LIBS结果与参考方法 (FAAS) 进行比较以验证.
主要方法:
- 通过加气相试剂 (甲基化物-混合物) 在干燥液体样本的激光切除过程中生成CaF分子.
- 在等离子体羽毛中对CaF形成的仪器参数的优化.
- 应用内部标准化和同位素稀释用于定量分析.
- 使用部分最小平方回归 (PLS) 进行同位素数据增强.
主要成果:
- 成功生成了CaF分子,并实现了CaF分子在等离子体羽毛中的排放.
- 在583.0 nm的CaF X2Σ→A2Π (0,1) 过渡的计算同位素转移为292.3 pm.
- 在自来水 (47 ± 16 毫克 L-1) 和脱脂牛奶 (1100 ± 140 毫克 L-1) 中量化确定.
- 20毫克L-1的检测极限用于内部标准化和从400毫克L-1的同位素稀释的适用性.
- 在LIBS和FAAS结果之间没有发现显著差异 (t-test,95%的置信度).
结论:
- 这种新方法允许使用LIBS.同时确定元素度和同位素组成.
- 这种方法扩大了LIBS的适用性,包括痕迹实验和同位素稀释分析.
- 开发的技术在复杂矩阵中提供了准确可靠的定量分析.
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