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首页> 外文期刊>X-Ray Spectrometry: An International Journal >Plant elemental composition and portable X-ray fluorescence (pXRF) spectroscopy: quantification under different analytical parameters
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Plant elemental composition and portable X-ray fluorescence (pXRF) spectroscopy: quantification under different analytical parameters

机译：植物元素组成和便携式X射线荧光（pXRF）光谱：不同分析参数下的定量

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Emergence of portable X-ray fluorescence (pXRF) systems presents new opportunities for rapid, low-cost plant analysis, both as a lab system and in situ system. Numerous studies have extolled the virtues of using pXRF for a wide range of plant applications, however, for many such applications, there is need for further assessment with regards to analytical parameters for plant analysis. While pXRF is a potential powerful research tool for elemental composition analysis, its successful use in plant analysis is made more likely by having an understanding of X-ray physics, calibration process, and ability to test a variety of homogenous and well-characterized materials for developing a matrix-specific calibration. Because potential pXRF users may often underestimate the complexity of proper analysis, this study aims at providing a technical background for plant analysis using pXRF. The focus is on elemental quantification under different analytical parameters and different methods of sample presentation: direct surface contact under vacuum, placement in a sample cup with prolene as a seal, and without the aid of a vacuum. Direct analysis on the surface of a pXRF provided highest sensitivity and accuracy (R-2>0.90) for light elements (Mg to P). Sulfur, K, and Ca can be reliably measured without the aid of a vacuum (R-2>0.99, 0.97, and 0.93 respectively), although lower detection limits may be compromised. pXRF instruments provide plant data of sufficient accuracy for many applications and will reduce the overall time and budget compared with the use of conventional techniques. Sensitivity and accuracy are dependent on the instrument's settings, make, and model. (c) 2015 The Authors. X-Ray Spectrometry published by John Wiley & Sons, Ltd.
机译：便携式X射线荧光（pXRF）系统的出现为实验室系统和原位系统提供了快速，低成本植物分析的新机会。许多研究都夸大了在许多工厂应用中使用pXRF的优点，但是，对于许多此类应用，需要针对植物分析的分析参数进行进一步评估。尽管pXRF是元素组成分析的潜在强大研究工具，但通过了解X射线物理特性，校准过程以及测试各种均质和特性良好的材料的能力，更有可能将其成功用于植物分析。开发特定于基质的校准。由于潜在的pXRF用户可能经常低估了适当分析的复杂性，因此本研究旨在为使用pXRF进行植物分析提供技术背景。重点是在不同的分析参数和不同的样品呈递方法下进行元素定量：在真空下直接接触表面，放置在带有prolene作为密封的样品杯中，并且无需借助真空。直接分析pXRF可以为轻元素（Mg至P）提供最高的灵敏度和准确性（R-2> 0.90）。尽管可以降低检测限，但无需借助真空即可可靠地测量硫，钾和钙（分别为R-2> 0.99、0.97和0.93）。 pXRF仪器可为许多应用提供足够准确的工厂数据，与使用常规技术相比，它将减少总体时间和预算。灵敏度和准确性取决于仪器的设置，制造和型号。 （c）2015作者。 X射线光谱法，由John Wiley＆Sons，Ltd.发布。

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