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用PMT增强的LIBS具有精确的时间控制,用于在大米中检测超敏感的

Zhanjian Lin¹, Wu Wang¹, Jianshui Yu¹

¹School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China.

|December 4, 2025

概括

在农产品中精确检测是至关重要的. 一种使用激光诱导分解光谱技术的新方法,采用机和光倍增管,改善了信号检测,降低了检测的极限.

科学领域:

分析化学分析化学
频谱学是一种光谱学.
农业科学农业科学

背景情况:

摄入的 (Se) 在狭窄的度范围内是有益的.
准确检测农产品中的Se是必不可少的.
传统的激光诱导分解光谱 (LIBS) 由于激发和观察困难,在检测Se方面面临挑战.

研究的目的:

开发一种快速而准确的方法来检测农产品中的.
为了克服传统的LIBS对Se分析的局限性.
改进Se信号的选择性检测并减少干扰.

主要方法:

机与光倍增管 (PMT) 的集成,用于精确的信号定时.
利用延迟触发来选择性地捕获等离子体信号.
采用非延迟信号的信号曲解分析.
优化延迟时间以提高Se信号与干扰的比率.

主要成果:

开发的方法可以选择性地检测Se信号,最大限度地减少来自bremsstrahlung和其他元素的干扰.
定量结果显示,R2为0.991.1,显著改善.
通过平均相对标准偏差 (ARSD) 的14.2%,实现了高稳定性.
在固体样本中达到低于2ppm的检测极限 (LOD),这是该技术的首次.

结论:

集成的机-PMT系统提供了一种可靠和先进的方法来检测农产品中的.
这种技术增强了信号选择性,减少了干扰,提高了定量准确性.
实现的低LOD为确保丰富食品的质量提供了有价值的工具.

关键词:

激光诱导的分解光谱学摄影倍增器管的使用方法是一种.时间控制时间控制时间.

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