Spectroscopy and Spectral Analysis, Volume. 35, Issue 3, 809(2015)
Evaluation of Field Portable X-Ray Fluorescence Performance for the Analysis of Ni in Soil
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 soil moisture 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 relative uncertainty 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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DU Guo-dong, LEI Mei, ZHOU Guang-dong, CHEN Tong-bin, QIU Rong-liang. Evaluation of Field Portable X-Ray Fluorescence Performance for the Analysis of Ni in Soil[J]. Spectroscopy and Spectral Analysis, 2015, 35(3): 809
Received: Apr. 18, 2014
Accepted: --
Published Online: May. 21, 2015
The Author Email: Guo-dong DU (dugdsmile@163.com)