Add time:08/11/2019         Source:sciencedirect.com

Titrations based on both complex formation and ion-pair formation principles have been used in assaying nine anionic azo dyes, namely C.I. 13900, C.I. 15685. C.I. 15705, C.I. 15710, C.I. 16680, C.I. 18744, C.I. 18760, C.I. 18821 and Calmagite. The results show that the titrations of the dye anions can he performed using quaternary nitrogen salts as titrants, and can be monitored using a simple PVC membrane coated-wire electrode as a sensor in media buffered to an optimum pH value depending on the protolytic equilibria of the determinand. The complex formation titrations with copper(II) nitrate and copper (II) ion-selective electrode can also be carried out in either acetate or ammonia buffers. By comparing the results of both methods, more reliable conclusions can be made with regard to the sample purity.

We also recommend Trading Suppliers and Manufacturers of 4-[(2-hydroxy-1-naphthyl)azo]naphthalenesulphonic acid (cas 18268-54-7). Pls Click Website Link as below: cas 18268-54-7 suppliers