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| Effect of Soil Moisture Content on the Fluorescence Characteristics of Polycyclic Aromatic Hydrocarbons |
| 杨仁杰1, 孙雪杉1, 王 斌2，董桂梅1, 杨延荣1，周长宏1，张伟玉1*，刘海学3* |
1. College of Engineering and Technology, Tianjin Agricultural University, Tianjin 300384, China
2. The Photonics Center of The Physics Institute, Nankai University, Tianjin 300071, China
3. Laboratory of Agricultural Analysis，Tianjin Agricultural University, Tianjin 300384, China |
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Abstract Fluorescence spectroscopy has been used to detect polycyclic aromatic hydrocarbons (PAHs) in soil. However, the soil moisture has a strong interference to the fluorescence intensity of PAHs, which is a challenge to the development of the rapid real-time detection technology of PAHs in soil. In order to analyze the effect of soil moisture on the fluorescence characteristics of PAHs, 8 phenanthrene contaminated soil samples were prepared with different moisture content (5%~40%, interval of 5%). The dynamic one-dimensional fluorescence spectra of soil samples with different moisture content were obtained by LS-55 fluorophotometer. Two-dimensional (2D) correlation fluorescence spectrum was calculated under the perturbation of soil moisture content. It was found that the fluorescence intensity of phenanthrene at 386, 408 and 432 nm enhanced with the increase of soil moisture content, while the Rayleigh scattering light intensity at 333 nm was decreased. And, it is pointed out that the effect of soil moisture on fluorescence can be corrected by establishing the relationship among fluorescence intensity, Rayleigh scattering intensity and soil moisture content. Meanwhile, the effect of soil moisture on the standard curve of phenanthrene concentration was studied. It is demonstrated that the soil moisture has a great influence on the quantitation of phenanthrene.
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Received: 2016-06-09
Accepted: 2016-11-18
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Corresponding Authors:
ZHANG Wei-yu, LIU Hai-xue
E-mail: zhangweiyu@tjau.edu.cn; liuhaixue@tjau.edu.cn
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