Abstract：Total concentrations of Cu, Pb, As, Cr, Ni and Zn were determined for 53 soil samples using portable X-ray fluorescence (PXRF) system in in-situ and ex-situ (Lab.)conditions. PXRF metal concentrations were statistically compared with analytical results from traditional AAS/AFS analysis. The ability of PXRF instrument to produce comparable analytical results to the reference method was assessed by linear regression. To investgate the effects of soil moisture on PXRF, the in-situ moisture content of all soil samples was quantified and the metal concentrations of selected samples with known moisture contents were measured too. The results showed that the detection limits of PXRF for Cu, Pb, As, Cr, Ni and Zn were 10.6, 8.1, 5.7, 22.5, 21.6 and 10.4 mg·kg-1, respectively. A good degree of linearity was found for Pb, Cr, Ni and Zn in in-situ condition. While in ex-situ condition, quantitative level data were achieved across the entire range of samples tested for Cu, Pb, Cr, Ni and Zn. X-ray fluorescence spectrometry was shown to be an effective tool for quantification and rapid assessment of heavy metals in soils. Soil moisture content did affected the performance of PXRF, the mean percent difference for soil samples in-situ with moisture content less than 15% and higher than 25% was -17% and -31% respectively. In ex-situ condition, as the soil moisture content increased from air dried level to 30%，the mean percent difference decreased from 10% to -24%. The dilution effect of moisture in soils may cause discrepancies with conventional analytical results and induce worse data quality, and it should be controlled within 0～25% in in-situ condition.
Key words：X-ray fluorescence;Soil heavy metals;Soil moisture;Line regression;Data quality
冉 景1, 2，王德建1*，王 灿1，薄录吉1, 2，郑继成1, 2，姚利鹏1, 2 . 便携式X射线荧光光谱法与原子吸收/原子荧光法测定土壤重金属的对比研究 [J]. 光谱学与光谱分析, 2014, 34(11): 3113-3118.
RAN Jing1, 2, WANG De-jian1*, WANG Can1, BO Lu-ji1, 2, ZHENG Ji-cheng1, 2, YAO Li-peng1, 2. Comparison of Soil Heavy Metals Determined by AAS/AFS and Portable X-Ray Fluorescence Analysis. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(11): 3113-3118.
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