| 光谱学与光谱分析 |
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| Evaluation of Field Portable X-Ray Fluorescence Performance for the Analysis of Ni in Soil |
| DU Guo-dong1, 2, LEI Mei1*, ZHOU Guang-dong1, 2, CHEN Tong-bin1, QIU Rong-liang3 |
1. Institute of Geographic Science and Natural Resource Research, Chinese Academy of Sciences, Beijing 100101, China
2. University of Chinese Academy of Sciences, Beijing 100024, China
3. School of Environmental Science and Engineering of Sun Yat-sen University, Guangzhou 510275, China |
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Abstract As a rapid, in-situ analysis method, Field portable X-ray fluorescence spectrometry (FP-XRF) can be widely applied in soil heavy metals analysis field. Whereas, some factors may affect FP-XRF performance and restrict the application. Studies have proved that FP-XRF has poorer performance when the concentration of target element is low, and soil moisture and particle size will affect FP-XRF performance. But few studies have been conducted in depth. This study took an example of Ni, demonstrated the relationship between Ni concentration and FP-XRF performance on accuracy and precision, and gave a critical value. Effects of soilmoisture and particle size on accuracy and precision also had been compared. Results show that, FP-XRF performance is related to Ni concentration and the critical value is 400 mg·kg-1. Relative standard deviation (RSD) and relativeuncertainty decrease while the Ni concentration is below 400 mg·kg-1, hence FP-XRF performance improves with increasing Ni concentration in this range;RSD and relative uncertainty change little while the Ni concentration is above 400 mg·kg-1, hence FP-XRF performance does not have correlation with Ni concentration any more. For in-situ analysis, the relative uncertainty contributed by soil moisture is 3.77%, and the relative certainty contributed by particle size is 0.56%. Effect of soil moisture is evidently more serious than particle size both on accuracy and precision.
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Received: 2014-04-18
Accepted: 2014-07-20
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Corresponding Authors:
LEI Mei
E-mail: leim@igsnrr.ac.cn
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