Rapid determination of the content of carboxymethyl cellulose sodium in aqueous solution by a color indicator-assisted spectroscopy

Abstract

This paper reports on a color indicator-assisted spectrophotometric method for the determination of carboxymethyl cellulose sodium (CMC-Na) content in aqueous solution. Methyl blue (MB) was used as the color indicator and its absorbance at 597 nm can be instantly attenuated when the CMC-Na was introduced. The results showed that there was a linear relationship (R2 = 0.999) between the inverse of MB absorbance at 597 nm and the content of CMC-Na; The present method has a very good measurement precision (relative standard deviation < 1.15%) and accuracy (relative error < 4.37%, when compared with the results measured using the oven-dry method). The present method is very simple and rapid, and it is suitable for use in the mill operation, aiming at a timely process control.

Keywords

• Carboxymethyl cellulose sodium
• Methyl blue
• Indicator
• Spectroscopy