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Flow-injection determination of water in organic solvents by near-infrared spectrometry

Abstract:

A flow-injection (FI) procedure was developed for the direct determination of water in organic solvents by using the OH stretch absorbance band of water in the near-infrared (NIR) region. Dichloromethane was employed as a test solvent to study the influence of the flow parameters (carrier flow and sample injection volume) and time interval on the sensitivity and repeatability of the FI-NIR measurements. The developed procedure permits the determination of water in dichloromethane and isobutyl methyl ketone samples with limits of detection of 0.01 and 0.005% (v/v), respectively. Real and spiked samples of solvents were analysed by FI-NIR and accurate results were found. The method is rapid, it does not require any pretreatment of samples and it is free from contamination of samples by atmospheric humidity. © 1993.