Abstract

FT-NIR spectroscopy allows scientists to develop high-precision quantitative methods in a laboratory environment. These methods are a lot more precise and reproducible than the current methods developed with techniques such as UV/visible spectroscopy, chromatography or potentiometric titration. However, the higher the precision the more difficult will be the calibration development and instrument transfer processes. Depending on the precision required, different parameters start to influence the results. One of the first parameters to take into account is the temperature but with increasing the precision increases the evaporation of solvent, sample homogeneity, the number of calibration samples, the appearance of bubbles and variation of the pathlength start to influence the results. The calibration set can be built in the laboratory. In this case the %SEP is always better than the reproducibility obtained when the method is transferred to the production area. However, precision could be improved when the number of scans was increased. However, this number has to remain reasonable to retain near infrared's advantage of rapid response. In this paper, examples relating to several solutions in water will show the different stages we followed to obtain a 0.025% repeatability, having in mind the need to transfer the method to the plant (quality control lab).

© 1998 NIR Publications

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High Precision Measurements with Simple Equipment*

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A Method for the Determination of Atmospheric Transmission Functions from Laboratory Absorption Measurements*

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