Quantitative analysis of bicomponent dye solutions by derivative spectrophotometry

Abstract

Purpose

Application of ratio spectra derivative spectrophotometery to quantitative analyses of bicomponent dye mixtures.

Design/methodology/approach

The binary mixtures of five textile dyes including yellow, scarlet, red, blue, and navy blue colors were analysed by ratio spectra derivative spectrophotometry. The absorption spectra of the binary mixtures, prepared in different ratios, were recorded between 400 and 700 nm. The obtained spectra were divided by a standard spectrum of each component of the binary mixtures, and then the derivative spectra were calculated. The amounts of dyes were determined by the measurements in the appropriate wavelengths in the range of 400‐700 nm.

Findings

The analysis of obtained results via the proposed derivative and normal methods show higher accuracy of the developed method in determination of dye contents. The proposed derivative technique was found to be easily applicable for the quantitative analysis of dyes with both overlapping and non‐overlapping spectra in their binary mixtures.

Practical implications

The developed method can be a simple and practical solution to the quantitative analysis of bicomponent dye solutions with overlapping spectra.

Originality/value

Ratio spectra derivative spectrophotometery is introduced as a new approach for achieving the higher accuracy of determination of dye concentration in bicomponent dye solutions. The developed strategy could be applied in color industries where fine resolution of bicomponent dye mixtures is needed.

Citation

Nateri, A.S. and Ekrami, E. (2009), "Quantitative analysis of bicomponent dye solutions by derivative spectrophotometry", Pigment & Resin Technology, Vol. 38 No. 1, pp. 43-48. https://doi.org/10.1108/03699420910923571