- P-ISSN 1225-0163
- E-ISSN 2288-8985
A reactive dye synthesized with an amine containing Eriochrome Black T derivative and cynauric chloride was immobilized on a cellulose membrane to construct an optical sensor for the detection of divalent transition metal ions in aqueous solution. The response of this reactive dye-based optical sensor was as sensitive as that of Eriochrome Black T in solution phase. Its typical detection limits for <TEX>$Zn^{2+}$</TEX> and <TEX>$Co^{2+}$</TEX> were <TEX>$6.3{\times}10^{-5}mol/l$</TEX> and <TEX>$2.5{\times}10^{-4}mol/l$</TEX>, respectively. No loss in the sensitivity of reactive dye-based sensor was observed even the pH of flowing solutions continually varied for an extended period of time.