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Infrared Spectrometric Purity Control of Organic Liquids and Water
10.1002/clen.200900126.abs
For the purpose of purity control, spectral comparisons are performed by regressing the infrared spectrum of a potentially polluted sample on the reference spectrum of the pure compound. The resulting correlation coefficient,R, is a measure of the similarity between both spectra. It is shown that it is advantageous to transformRto Fisher'sZ coefficient, especially in the case of relatively small impurities. Following this transformation, a critical value forZ can be determined by reproducibility measurements and if Zfalls below this critical value for a certain sample, a contamination of the examined product will be diagnosed. As a first example, the manner in which a certain type of phthalate plasticizer containing small contaminations of another similar type can be analyzed, is described. The purity control of water is discussed as a second example. In this case, potassium hydrogen phthalate is the impurity that can be detected. All spectra are measured by multiple internal reflection using a Diamond Attenuated Total Reflectance (ATR) accessory. Impurities in the per mill range (ca. 0.1–10%) can be detected using this technique.
Infrared Spectrometric Purity Control of Organic Liquids and Water
10.1002/clen.200900126.abs
For the purpose of purity control, spectral comparisons are performed by regressing the infrared spectrum of a potentially polluted sample on the reference spectrum of the pure compound. The resulting correlation coefficient,R, is a measure of the similarity between both spectra. It is shown that it is advantageous to transformRto Fisher'sZ coefficient, especially in the case of relatively small impurities. Following this transformation, a critical value forZ can be determined by reproducibility measurements and if Zfalls below this critical value for a certain sample, a contamination of the examined product will be diagnosed. As a first example, the manner in which a certain type of phthalate plasticizer containing small contaminations of another similar type can be analyzed, is described. The purity control of water is discussed as a second example. In this case, potassium hydrogen phthalate is the impurity that can be detected. All spectra are measured by multiple internal reflection using a Diamond Attenuated Total Reflectance (ATR) accessory. Impurities in the per mill range (ca. 0.1–10%) can be detected using this technique.
Infrared Spectrometric Purity Control of Organic Liquids and Water
Kondagula, Fayaz (Autor:in) / Molt, Karl (Autor:in)
CLEAN – Soil, Air, Water ; 37 ; 955-962
01.12.2009
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Infrared Spectrometric Purity Control of Organic Liquids and Water
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