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使用热转换结合光谱重构过差光学吸收光谱学来敏感检测OCS

Yongqi Wu¹, Jie Gao¹, Mu Li¹

¹School of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China.

Analytical chemistry

|May 16, 2024

概括

一个新的在线系统在ppb水平上检测有毒碳硫化物 (OCS) 气体. 这种方法将OCS转化为SO2并使用光谱重建过来准确地发出危险警告.

科学领域:

环境科学环境科学
分析化学分析化学
频谱学是一种光谱学.

背景情况:

碳硫化物 (OCS) 是一种有毒的工业气体,需要敏感的检测来警告危险.
使用微分光学吸收光谱学 (DOAS) 直接检测OCS是具有挑战性的,因为其吸收能力较弱.
工业过程和人类健康受到OCS暴露的风险.

研究的目的:

在PPB层面开发一个在线系统,用于敏感的OCS检测.
使用DOAS克服OCS检测的局限性.
提供一种可靠的方法来监测各种环境中的OCS度.

主要方法:

实施了热转换,将OCS转化为二氧化硫 (SO2),它具有更强的吸收特性.
开发了一种光谱重建过 (SRF) 方法,以消除噪音和干扰.
通过安排强度而不是波长来重建光谱,以获得SO2吸收分析的线性特征.

主要成果:

在100ppb的OCS度下达到0.88%的相对偏差.
使用SRF-DOAS方法为OCS确定了7.26ppb*m的检测极限.
成功证明了系统在检测气体混合物和人类呼吸中的OCS中的可靠性.

结论:

该SRF-DOAS系统提供了一个敏感和可靠的在线方法用于OCS检测.
热转换和光谱重建过有效地解决了OCS的弱吸收和光谱干扰.
这项技术对于工业环境中的危险预警和环境监测有价值.

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