杜一平张璇陈贵平李炜
华东理工大学,上海市功能性材料化学重点实验室,上海200237
摘要:由于信号本身灵敏度低这一本质原因,近红外光谱分析技术在低含量物质检测上存在明显的弱点。通常NIR检测
百分含量的物质,检测低限在0.1%或0.01%以上(1000或100 mg/kg,ppm)。如果含量过低,检测误差(相对误差)将明显增大。为了提高检测灵敏度,扩展近红外光谱分析技术的应用范围,国内外一些课题组近年来开展了较多的研究工作[1-8]。
在这些工作中普遍采用的就是富集技术,这是提高NIR检测灵敏度的一个简单实用的手段,但在设计富集装置时应该充分考虑保持NIR分析的优点,如简单、快速等。另外,纯粹的金属离子在理论上是不能产生NIR信号的,因此NIR不适合于检测金属离子,但通过富集技术可以将金属离子与有机官能团相结合,实现金属离子的间接NIR检测。
近红外光谱;预富集;检出限
Assessment of Ability to Detect Low Concentration Analyte With Y i p i n gN DeuarX-uiann fZrhaarnegdG uSippeicngt rCohsecnoW
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st, East China University of Science and
Abstract: The low molar absorptivity of near infrared signals which considerably decreases its sensitivity limits its application in
micro and trace level analysis. Usually the detectable concentration range is in the 1000ppm or 100ppm level, and the relative errors
increase with the decrease of sample concentration. For improving the sensitivity, some papers [1-8] were reported to solve these
problems recently. Among these works a method which combines the NIR diffuse reflectance spectroscopy and pre-concentration technique was widely proposed for the analysis of low concentration analyte. However, when designing the enrichment device the
advantages of NIR spectroscopy (simple, rapid, ect.) should be considered. In addition, theoretically metal ions cannot give a direct
signal in NIR spectra. Therefore, NIRS is seldom used in quantitative analysis of metal ions. Nevertheless, analysis of metal ion
contents still can be performed by NIRS based on the interaction of metal ions and organic compounds which can be reflected in NIR
spectra using enrichment technique.
Near-infrared spectroscopy; Pre-concentration; Detection limit
近红外光谱分析低含量组分的能力评价
作者:作者单位:
杜一平, 张璇, 陈贵平, 李炜
华东理工大学,上海市功能性材料化学重点实验室,上海200237
引用本文格式:杜一平.张璇.陈贵平.李炜 近红外光谱分析低含量组分的能力评价[会议论文] 2012
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