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相关概念视频

NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences01:20

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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
756

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一种有效的湿度干扰校正方法用于玉米粉的NIR光谱分析.

Xiaohong Li1, Zhuopin Xu2, Liwen Tang3

  • 1Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China; University of Science and Technology of China, Hefei 230026, China.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy
|February 21, 2024
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概括
此摘要是机器生成的。

使用近红外光谱 (NIRS) 精确检测玉米粉至关重要. 外部参数正交 (EPO) 与波长选择相结合,通过克服湿度干扰来提高NIRS准确性.

关键词:
外部参数的正交表示玉米粉 玉米粉是一种调整湿度的纠正方法接近红外光谱学近红外光谱学协同效应区间部分最小平方.

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科学领域:

  • 农业科学 农业科学
  • 分析化学 分析化学
  • 频谱学是一种光谱学.

背景情况:

  • 精确检测玉米粉含量对于玉米加工行业至关重要.
  • 近红外光谱 (NIRS) 是这种分析的快速和理想的技术.
  • 湿度干扰严重阻碍了NIRS对玉米的定量分析的准确性.

研究的目的:

  • 开发改进的NIRS方法,以准确检测玉米粉.
  • 为了应对 NIRS 对玉米的分析中湿度干扰的挑战.
  • 为了评估外部参数正交 (EPO) 与波长选择算法相结合的性能.

主要方法:

  • 研究了两组不同含水量的玉米粉样本.
  • 应用外部参数正交 (EPO) 与协同效应区间部分最小平方 (siPLS) 算法相结合.
  • 与PLS,EPO-PLS和siPLS模型进行预测性能比较.

主要成果:

  • 该EPO-siPLS模型显示出卓越的预测准确性.
  • 与siPLS相比,在RMSEP/RMSEPck中取得了9.7%的改善.
  • 与EPO-PLS (25.3%) 和PLS (45.8%) 模型相比,显示出显著的改善.

结论:

  • 外部参数正交 (EPO) 结合协同区间部分最小平方 (siPLS) 为玉米粉检测提供了更准确和更强大的方法.
  • 这种方法有效地减轻了NIRS分析中的水分干扰.
  • 为NIRS在农产品分析中的应用提供了宝贵的见解.