There is an Open Access version for this licensed article that can be read free of charge and without license restrictions. The content of the Open Access version may differ from that of the licensed version.
Pricing information
Please choose your delivery country and your customer group
Factors which produce imprecision during quantitative analysis of aqueous solutions using the CIRCLE CELL have been investigated. The FT-IR spectra of aqueous solutions have been recorded over the concentration range 0.01 to 90% (w/w). Using a micro-boat sampling cell, fixed in position within the CIRCLE CELL optical bench, we have found that the uncertainty in repositioning the micro-boat sampling cell, within the CIRCLE CELL optical bench, was the most important factor causing imprecision during quantitative analysis of aqueous solutions, especially as the detection limit was approached. At low concentrations, quantification using peak height values was more precise than that using integrated peak area values. Integrated peak area values, however, gave a more linear response and better correlation with Beer's law over a large concentration range. The reliable detection limit was found to be 0.05% (w/w). Keywords: Micro boat sampling cell; Infrared spectroscopy; CIRCLE CELL; Aqueous solutions; Quantitative analysis, reprints. (mjm)