双阶段激发源提高了微型光学发射光谱仪的分析灵敏度
Hao Shen1, Ji-Ying Cai1, Jian-Hua Wang1
1Research Center for Analytical Sciences, Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, China.
Talanta
|January 9, 2025
概括
结合介电屏障放电 (DBD) 和点放电 (PD) 的新型双阶段激发源显著提高了微等离子体在元素分析中的性能. 这种DBD-PD源增强了光学发射光谱 (OES) 的灵敏度,以改善现场元素检测.
科学领域:
- 分析化学 分析化学
- 等离子体物理学的物理学
- 频谱学是一种光谱学.
背景情况:
- 微型光学发射光谱仪 (OES) 设备需要增强的微等离子体激发源,以进行有效的现场元素分析.
- 提高微塑源的激发能力对于提高OES设备的分析性能至关重要.
研究的目的:
- 通过结合介电屏障放电 (DBD) 和点放电 (PD) 技术,开发和评估一种增强的双阶段激发源 (DBD-PD).
- 调查微等离子体参数特征和成像,以了解DBD-PD源的增强机制.
- 以信号强度,检测极限和元素分析的精度来评估性能改进.
主要方法:
- 构建一个集成DBD和PD技术的双阶段激发源.
- 微塑参数特征的计算.
- 使用快门强化电荷合装置 (ICCD) 摄像机对微等离子体状态进行成像.
- 将DBD-PD与其他来源 (DBD,PD,PD-DBD) 的Se和As信号强度进行比较.
- 检测极限和相对标准偏差 (RSD) 的确定.
- 使用经认证的参考材料和实际的水样进行验证.
主要成果:
- 与单个DBD,PD和PD-DBD源相比,DBD-PD源显示出显著提高的激发效率和OES信号灵敏度.
- Se和As的信号强度分别提高了多达16.0倍和11.6倍.
- 在最佳条件下达到0.8μg L−1的Se和0.2μg L−1的As的检测极限,RSD低于5%.
- 经过认证的参考材料和真实水样的成功分析证实了该方法的可靠性.
结论:
- DBD-PD双阶段激发源在微型OES设备的现场性能方面取得了实质性的进步.
- 这种增强的激发策略为in-situ元素分析的灵敏度和检测极限提供了显著的飞跃.
- 该DBD-PD源具有广泛的潜力,用于各种元素分析应用,特别是环境监测和现场测试.
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