Voltammetric Determination of Dye-Uptake for C. I. Acid Blue 120 Dyeing Silk

Abstract

The electrochemical behavior of Colour Index Acid Blue 120 at carbon paste electrode is studied with cyclic voltammetry and square wave voltammetry for the first time. Two irreversible oxidative peaks at 0.61 V (P_a,1) and 0.90 V(P_a,2) (both vs. SCE) are found at a scan rate of 0.1 V/s. Their electrode processes are both adsorption-controlled with two electrons and two protons participating. The peak currents of the P_a,1 are proportional to the concentration of Colour Index Acid Blue 120 in the range of 2.08–20.80 µM and 62.4–520.0 µM. The coexisting substances such as inorganic ions and fatty alcohol polyoxyethylene ether do not interfere with the determination. The method is applied to the determination of dye-uptake for Colour Index Acid Blue 120 dyeing silk. The results are in good agreement with the spectrophotometric method.

Keywords:

• Colour index acid blue 120
• dye-uptake
• voltammetry

Thanks for the financial support of the scientific research project from the Ministry of Education of Shaanxi Province (Grant No. 07JK254) and the scientific research project from Xi'an Polytechnic University (Grant No. 06XG017).

Notes

^a The addition of WAGR was 130 µM.

^b Standard deviation.