Determination of Cr, Cu, Zn, Pb and As in Soil by Field Portable X-Ray Fluorescence Spectrometry
LU An-xiang1, 2, WANG Ji-hua1, 2*, PAN Li-gang1, 2, HAN Ping1, 2, HAN Ying3
1. Beijing Research Center for Agri-food Testing and Farmland Monitoring, Beijing 100097, China 2. National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China 3. Beijing Purkinje General Instrument Co., Ltd., Beijing 100081, China
Abstract：Total concentrations of Cr, Cu, Zn, Pb and As were determined in soil samples from Beijing, Xinjiang, Heilongjiang, Yunnan, and Jiangsu provinces, using field portable X-ray fluorescence spectrometry (XRF). The relationship between XRF analysis results and the concentration of heavy metals in soils was established. The influence of soil particle size and humidity was also considered. Experiments showed that the particle size of soil affected XRF performance. While particle size decreased from 420 to 180 μm, the relative standard deviation (RSD) of XRF detect results reduced from 15.6% to 6.9%. Soil humidity mainly affected the counts of XRF measured. As the soil water content increased from 5% to 25%, the analysis result’s relative ratio of humid soil samples to oven dried soil samples decreased from 86% to 69%, according with the equation I=100e-0.015c, where I means relative ratio, and c means water content (R2=0.83, n=30). A high degree of linearity was found for all the five heavy metals with the XRF measurement in the range of 0 to 1 500 mg·kg-1. But the linearity equation was not the same among these soils. The linearity equation established with Yunnan soil has a small slope because of higher Fe concentration in soil. The performance of instrument was assessed by comparing XRF analysis result with the standard sample reference, and the result showed that XRF is an effective tool for rapid, quantitative monitoring of soil metal contamination.
陆安祥1，2，王纪华1，2*，潘立刚1，2，韩 平1，韩 莹3 . 便携式X射线荧光光谱测定土壤中Cr，Cu，Zn，Pb和As的研究 [J]. 光谱学与光谱分析, 2010, 30(10): 2848-2852.
LU An-xiang1, 2, WANG Ji-hua1, 2*, PAN Li-gang1, 2, HAN Ping1, 2, HAN Ying3 . Determination of Cr, Cu, Zn, Pb and As in Soil by Field Portable X-Ray Fluorescence Spectrometry . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(10): 2848-2852.
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