A Comprehensive Study of Three Different Portable XRF Scanners to Assess the Soil Geochemistry of An Extensive Sample Dataset
A Comprehensive Study of Three Different Portable XRF Scanners to Assess the Soil Geochemistry of An Extensive Sample Dataset
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DOI：
10.3390/rs11212490
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发表时间：
2019-11-01
期刊：
影响因子：
5
通讯作者：
Verdoodt, Ann
中科院分区：
文献类型：
--
作者：
Declercq, Ynse;Delbecque, Nele;Verdoodt, Ann
土壤元素浓度的评估目前主要通过传统的实验室分析进行。然而，近端土壤传感（PSS）技术，如X射线荧光（XRF）光谱法被证明可以减少分析时间和成本，从而提供了一个有价值的替代实验室分析。此外，XRF扫描仪是非破坏性的，可以直接在现场使用。尽管XRF在土壤元素分析中的应用越来越被广泛接受，但大多数以前的研究仅限于一台扫描仪，几个样品，几个元素或非多样化的样品数据库。在这里，一个广泛和多样化的土壤数据库被用来比较三种不同的XRF扫描仪的性能与通过传统的实验室分析获得的结果。扫描仪以台式模式使用，内置土壤校准，以测量15种元素的浓度。尽管在许多样品中，Cu、S、P和Mg的浓度被XRF高估了6、12、13和5倍，并且建议进行经验重新校准，但所有扫描仪都产生了可接受的结果，即使是较轻的元素。出乎意料的是，XRF的性能似乎并不取决于土壤特性，如CaCO3含量。虽然扩展到现场时性能会更差，但我们的研究结果表明，XRF可以很容易地被非专家应用于在广泛不同的环境中可靠地测量土壤元素浓度。
The assessment of soil elemental concentrations nowadays mainly occurs through conventional laboratory analyses. However, proximal soil sensing (PSS) techniques such as X-ray fluorescence (XRF) spectrometry are proving to reduce analysis time and costs, and thus offer a worthy alternative to laboratory analyses. Moreover, XRF scanners are non-destructive and can be directly employed in the field. Although the use of XRF for soil elemental analysis is becoming widely accepted, most previous studies were limited to one scanner, a few samples, a few elements, or a non-diverse sample database. Here, an extensive and diverse soil database was used to compare the performance of three different XRF scanners with results obtained through conventional laboratory analyses. Scanners were used in benchtop mode with built-in soil calibrations to measure the concentrations of 15 elements. Although in many samples Cu, S, P, and Mg concentrations were up to 6, 12, 13, and 5 times overestimated by XRF, and empirical recalibration is recommended, all scanners produced acceptable results, even for lighter elements. Unexpectedly, XRF performance did not seem to depend on soil characteristics such as CaCO3 content. While performances will be worse when expanding to the field, our results show that XRF can easily be applied by non-experts to measure soil elemental concentrations reliably in widely different environments.