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相关概念视频

Quantitative Analysis01:12

Quantitative Analysis

1.2K
Quantitative analysis is a technique for measuring the amount of specific constituents in a sample. When the sample's composition is unknown, qualitative analysis is performed first to identify its components, which ensures that the correct substances are measured during the quantitative phase.
In quantitative analysis, two key measurements are made: the sample quantity and a property proportional to the amount of the analyte (the substance being analyzed). This forms the basis of the...
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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Quantifying X-Ray Fluorescence Data Using MAPS
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在微型XRF中对不同量化方法的比较评估.

Abu Sm Sayam1, Ameya V Bhargava1, Gabrielle N Pedigo1

  • 1School of Health Sciences, Purdue University, West Lafayette, IN, 47906, USA.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine
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PubMed
概括

这项研究比较了使用骨幻象的两个微XRF量化方法. 基于标准的校准通常显示出比基本参数方法更好的结果,过器的选择会影响铁和等特定元素的准确性.

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科学领域:

  • 分析化学 分析化学
  • 材料科学 材料科学 材料科学
  • 生物医学成像技术 生物医学成像技术

背景情况:

  • 微XRF提供微米级分辨率,用于元素分析.
  • 由于样本属性和光不确定性,在微XRF中绝对量化具有挑战性.

研究的目的:

  • 为了比较基本参数 (FP) 方法和基于标准的微XRF量化校准.
  • 为了评估和过器对量化准确性的影响.
  • 为了评估骨幻象中的元素量化.

主要方法:

  • 使用已知元素度的内部骨幽灵.
  • 使用FP和基于标准的方法校准了四种元素 (铜,铁,,).
  • 使用和过器组件进行微型XRF分析.

主要成果:

  • 对于铜和,FP和标准校准都表现良好 (rs>0.98).
  • 使用过器进行基于标准的校准显示铁的性能优越 (p < 0.001).
  • 过器提高了的量化 (p < 0.001),而过器提供了较低的检测极限.

结论:

  • 基于标准的校准通常与便携式XRF测量比FP方法更好地相关.
  • 过器设置的选择对特定元素的量化准确性有重大影响.
  • 与过器相比,过器提供了较低的检测极限.