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Rapid detection of low concentration nitrate in water using Raman spectroscopy coupled with spectral decomposition

文献类型： 外文期刊

作者： Jin, Yuan 1 ; Tian, Hongwu 2 ; Jiao, Leizi 2 ; Zhao, Xiande 2 ; Yang, Guiyan 2 ;

作者机构： 1.Guangxi Univ, Nanning 530004, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Intelligent Equipment Res Ctr, Beijing 100097, Peoples R China

3.Shenyang Agr Univ, Coll Informat & Elect Engn, Shenyang 110866, Peoples R China

关键词： Raman spectra; Nitrate; Drinking water; Spectral decomposition; Rapid detection

期刊名称：INTERNATIONAL CONFERENCE ON OPTOELECTRONIC MATERIALS AND DEVICES (ICOMD 2021)

ISSN： 0277-786X

年卷期： 2022 年 12164 卷

页码：

收录情况： SCI

摘要： Nitrate is widely distributed in various water environments, and its potential toxicity poses a great threat to human health and environment. It is of great significance to realize rapid detection of nitrate in water. Raman spectroscopy, as a molecular spectrum, has been widely used in the detection of ionic concentration in liquid samples. However, fluorescence background interference and spectral peak overlap are still a challenge for the detection of trace targets in practical applications. In this study, we proposed a rapid detection method for nitrate at low concentration in drinking water based on Raman spectra combined with adsorption materials., The difference between characteristic spectrum of nitrate adsorption at low concentration and background spectrum of adsorption material was emphatically analyzed after verifying the effectiveness of nitrate adsorbent. The peak decomposition method of nitrate characteristic spectrum was established to achieve highly sensitive detection of nitrate concentration of 5-10 mg/L. The calibration curve of NO3--N concentration in 5-100 mg/L was established according to the normalized spectral intensity. The correlation coefficient R-2 of the established regression model reached 0.98. The root mean square error (RMSE) was 3.56 mg/L. This study provides a rapid detection method for nitrate in water, which can provide a low-cost assessment method for daily household drinking water quality and water quality purification combined with portable Raman spectrometer. At the same time, this method is also expected to achieve fast on-site detection for early warning response of surface water pollution.

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