基于白银颗粒在现场生长的微结构基质,用于用LIBS在液体样本中测定铜
Nilvan A Silva1, Ivo M Raimundo1, Maria Clara M de Andrade2
1Instituto de Química, Universidade Estadual de Campinas (UNICAMP), PO Box 6154, 13083-970, Campinas, Brazil.
Talanta
|February 2, 2026
概括
带有银纳米粒子和微粒的新纸基板增强了激光诱导分解光谱 (LIBS) 用于检测液体中的铜 (Cu(II)). 这种方法为敏感金属离子分析提供了14倍的信号改善.
科学领域:
- 分析化学 分析化学
- 材料科学 材料科学 材料科学
- 频谱学是一种光谱学.
背景情况:
- 控制液体样本中的有毒金属含量需要简单,高效的分析方法.
- 激光诱导分解光谱 (LIBS) 是一种元素分析技术.
- 增强LIBS信号对于敏感检测微量金属至关重要.
研究的目的:
- 开发一种微结构基质,用于在液体样本中对铜 (Cu(II)) 的增强LIBS分析.
- 为了制造一个基于纸的基板与现场培养的银纳米粒子 (AgNPs) 和银微粒子 (AgMPs).
- 评估基质在改善Cu (II) 信号检测方面的有效性.
主要方法:
- 使用过纸和白银颗粒在现场生长的微结构基板的制造.
- 对不同减少剂 (酸,NaBH4,SnCl2) 对银颗粒形成的评估.
- 使用UV-Vis扩散反射光谱,X射线衍射和扫描电子显微镜 (SEM) 进行基质的表征.
- 使用LIBS与开发的基板确定Cu (II) 并分析校准曲线,LOD和LOQ.
主要成果:
- 使用SnCl2作为还原剂,信号得到了8倍的改善.
- 银颗粒的进一步增长导致与未经修改的过纸相比,信号增强了14倍.
- 鉴定证实了AgNPs和AgMPs在基质上的有效固定.
- 获得了Cu(II) 的线性校准曲线 (R2=0.99),LOD为34μg L-1和LOQ为114μg L-1.
- 在强化河水,人工尿液和茶样中成功确定了Cu (II) 的含量,回收率为85-112%.
结论:
- 微结构的银基板显著增强了LIBS发射信号,用于Cu (II) 测定.
- 纳米结构和AgMP对纤维素微纤维的协同效应有助于信号增强.
- 开发的分析策略是有效的敏感和准确检测低度的金属离子在各种液体样本.
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