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Correction Method of Effect of Soil Moisture on the Fluorescence Intensity of Polycyclic Aromatic Hydrocarbons Based on Near-infrared Diffuse Reflection Spectroscopy
Environmental Pollution ( IF 8.9 ) Pub Date : 2020-11-25 , DOI: 10.1016/j.envpol.2020.116150
Guimei Dong , Xiaotong Li , Renjie Yang , Yanrong Yang , Haixue Liu , Nan Wu

Soil moisture has a strong impact on the fluorescence intensity of PAHs, which is undoubtedly posing a challenge for the development of rapid real-time fluorescence detection technology of PAHs in soil. In this work, NIR diffuse reflectance spectroscopy was used to correct the fluorescence spectra of PAHs in order to reduce the effect of the soil moisture. To establish the correction method, eight soil samples with different moisture contents and a given phenanthrene concentration (8 mg/g) were prepared. The fluorescence and NIR diffuse reflectance spectra were collected for of all samples. It was found that the fluorescence spectra of the soil samples that vary with the moisture content together with the NIR diffuse reflectance spectra were considered for the correction of the fluorescence intensity of phenanthrene related to the moisture content. The results showed that the ratio of the fluorescence intensity at 384 nm to the NIR diffuse reflectance spectrum absorbance at 5184 cm-1 can be used as a correction factor to reduce the effect of the soil moisture on the fluorescence intensity of phenanthrene in the soil. The validity of the correction method was verified by the quantitative analysis of PAHs with different concentrations and soil moisture contents. The results showed better linearity between the fluorescence intensity and the concentration of PAHs after the correction (with a correlation coefficient R of 0.99) than before the correction (with R of 0.86). The relative prediction errors for three unknown samples decreased from 19%, 51% and 40% before the correction to 5%, 13% and 0.44% after the correction, respectively, indicating the feasibility of the detection of PAHs in the soil by the combination of fluorescence and NIR diffuse reflectance spectroscopy.



中文翻译:

基于近红外漫反射光谱的土壤湿度对多环芳烃荧光强度影响的校正方法

土壤水分对PAHs的荧光强度有很强的影响,这无疑对发展土壤中PAHs的快速实时荧光检测技术提出了挑战。在这项工作中,近红外漫反射光谱法被用来校正多环芳烃的荧光光谱,以减少土壤水分的影响。为了建立校正方法,准备了八个水分含量和给定菲浓度(8 mg / g)不同的土壤样品。收集所有样品的荧光和近红外漫反射光谱。结果发现,随着水分含量的变化,土壤样品的荧光光谱与NIR漫反射光谱一起被认为可以校正与水分含量有关的菲的荧光强度。-1可以用作校正因子,以减少土壤水分对土壤中菲的荧光强度的影响。通过定量分析不同浓度和土壤含水量的多环芳烃,验证了校正方法的有效性。结果显示,校正后(相关系数R为0.99)比校正前(R为0.86)在荧光强度和PAHs浓度之间具有更好的线性关系。三个未知样品的相对预测误差分别从校正前的19%,51%和40%降低至校正后的5%,13%和0.44%,这表明通过组合检测土壤中PAHs的可行性荧光和近红外漫反射光谱学。

更新日期:2020-11-26
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