XRF Spectrometers and their Application for Sample Analysis

在两部分采访的一部分中，全球营销和业务开发，材料和矿物的全球总监Ravi Yellepeddi博士是Thermo Fisher Scientific化学分析部的一部分，与Azom关于XRF光谱仪的开发和应用程序的开发与AZOM亚博网站下载进行了讨论。该设备用于样品分app亚博体育析。

您可以在此处阅读本采访的第二部分。

作为分析工具的全球供应商，您如何描述该公司的核心能力？

Thermo Fisher Scientific是当今世界上最大的分析仪器公司，无论是在实验室方面还是在过程方面。我们的核心能力是，我们几乎涵盖了几乎所有的分析技术，但少数例外 - 覆盖了Z。，ICP-OE，IR和拉曼光谱，表面分析技术，例如ESCA，螺旋钻和微分析。

因此，就我们的能力而言，Thermo Fisher Scientific是一家独特的公司，全面具有分析技术的广度和深度，从有机侧的生命科学，生物技术和药品到水泥，金属，金属，矿物质，矿物质，矿物质，矿物质，矿物质，生物技术和药品亚博老虎机网登录，煤炭和材料加工。亚博网站下载

无论是在实验室空间还是过程控制环境中，还是在行业中还是在研究实验室中，Thermo Fisher Scientific都可以提供分析解决方案，以适应最苛刻的化学分析需求。

Thermo Fisher Scientific在四个主要品牌中运作：Thermo Scientific，Life Technologies，Fisher Scientific and Unity Lab Services。

元素分析是热科学的一部分。尽管该分区内具有广泛的X射线荧光（XRF）光谱仪，但您会说这条线中的关键产品是什么，为什么？

如您所知，可以将XRF仪器广泛分为能量分散和波长色散XRF。

以前的仪器（EDXRF）往往非常紧凑，更简单，移动或可运输。在大多数情况下，波长色散XRF（WDXRF）仪器是固定的，往往较重，以更高的功率运行，并需要在实验室中提供更多支持。从便携式XRF到台式（可运输）EDXRF到地板高端，高性能WDXRF仪器，X射线仪器的Thermo Scientific品牌，根据客户的需求和预算，提供了广泛的解决方案。

The XRF technology has been evolving continuously over the past 3 decades and has now become one of the matured analytical techniques to address a variety of industrial and non-industrial challenges. The technique itself is quite universal in the sense that all types of materials – organic or inorganic, solids or liquids, small or big objects, thick solids or thin films – can be measured using XRF. The XRF instrumentation has also become more self-sufficient in terms of peripheral support (water, power and gas supplies) and with integrated designs, recent generation of XRF analyzers are now much more economical and offer alternative analysis to traditional wet chemistry.

arl^TM值Thermo Scientific的Quant’x EDXRF光谱仪。

这是否意味着该技术的应用程序由于将XRF分析仪微型化而变得更加普遍？

是的，随着便携式和可运输的EDXRF分析仪的开发，这些分析仪随后由实验室的高性能WDXRF仪器完全支持，以满足更先进或要求的分析需求，因此在过去的二十年中，X射线荧光的应用领域迅速增长。Thermo Fisher Scientific一直在投资开发涵盖各种应用领域的创新产品。

How do you prepare a sample for your XRF machines and how is the data on a sample recorded and analyzed?

There are different sample preparation methods used for XRF analysis: one can directly measure a solid or a liquid sample depending on its size or quantity. Loose powders, granules, irregular objects and surfaces can be screened quickly with a portable XRF instrument before elaborate sample preparation is used. For more and more accurate and reliable analysis, one can grind the samples, press them into pellets or fuse into glass beads before submitting them for XRF analysis. The sample preparation is adopted depending on the type of sample and the analysis requirements. For a typical industrial process and quality control, more standardized sample preparation methods are needed for reliability and reproducibility.

For ad-hoc, non-routine samples, one can adopt the preparation method depending on the element coverage, the concentration ranges and whether or not the sample is chemically or physically stable. The analytical performance of the XRF instrument itself depends on the power of the X-ray tubes used, the optical coupling between the source of excitation, the sample, the dispersion devices, and the detector technology.

In a very simplified manner, any sample analysis can be grouped into Majors (>5%), Minors (0.5 to 5%) and Trace elements (<0.5%). The XRF technique in general is capable of detecting elements from ppm (parts per million) levels to 100% depending on the sample and type of instrument used.

例如，便携式或手持XRF仪器可以拾取大多数主要元素，次要元素和一些微量元素。更强大的台式仪器可以达到检测的下限，而高功率实验室WDXRF仪器可以满足更苛刻的应用程序，以降至子PPM级别。

尼顿^TM值XL3p Handheld XRF Analyzer by Thermo Scientific.

借助实验室中的台式产品，显然有一个更具控制的环境来进行样本分析和准备。在周围条件不容易控制的环境中，您的手持产品的应用如何影响？

Yes, the quality of analytical data is not only dependent on the type of instrument used but the conditions in which the samples are taken, prepared, analyzed and treated. Obviously the analytical expectations from a handheld XRF instrument versus a laboratory-stationary XRF instrument are different.

在前一种情况下，人们期望方便，快速的现场或现场分析，以便在进行更深入的分析之前快速识别化学反应。使用后者，即高功率WDXRF仪器，期望将产生准确，可重复和可靠的定量数据，以控制水泥厂或钢厂或石化炼油厂或在合同实验室等中的各种未知样品进行处理。在这两种情况下，读者都可以在我们的Thermo Scientific – Elemental Analysis division来自Thermo Scientific。

关于Ravi Yellepeddi博士

Ravi Yellepeddi博士, based in Switzerland, is currently Global Director of Marketing and Business Development, Materials and Minerals, part of Chemical Analysis Division at Thermo Fisher Scientific. He is involved in product development, applications and technical marketing activities for both Laboratory Analyzers and On-Line Process Analyzers in industrial and investigative areas such as cement, metals, minerals, petrochemicals and material science.