Citation:
LI Xiao-Li, LI Qing-Xia, AN Shu-Qing, ZHANG Qin, HAO Guo-Jie. Determination of Fluorine in Soil Sample by X-Ray Fluorescence Spectrometry[J]. Chinese Journal of Analytical Chemistry,
;2019, 47(11): 1864-1869.
doi:
10.19756/j.issn.0253-3820.181796
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Non-metallic fluorine as a pollutant has an important impact on human health and ecosystem. Fluorine in contaminated soil and sediment has long-term accumulation effect. Therefore, the determination of fluorine in soil is of great significance. Fluorine is an extra-light element, the excitation efficiency is low, the fluorescence yield is low, and it is easy to be absorbed in the optical path. In this study, to improve the resolution of fluorine determination, PX8 crystal was applied and the ratio of peak to background of PX8 crystal was nearly 2 times higher than that of PX1 crystal. The X-ray intensity of low atomic number element depended on the composition of matrix to a great extent. To reduce the influence of absorption/enhancement effect on fluorine determination, the calibration curve of fluorine was established by 35 soil reference materials only. The line overlap and matrix interference were corrected by empirical coefficients, and the linearity was good (R2=0.978). The limit of determination of a method (LDM) was 50 μg/g. The method was successfully used for detection of fluorine in 28 soil samples. The results showed that the values of fluorine in soil determined by X-fluorescence could meet the error requirement of the analysis.
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