Maryam Sadat Salami - Department of Chemistry, Payame Noor University ۱۹۳۹۵-۴۶۹۷, Tehran, Iran,
Hossein Tavallali - Department of Chemistry, Payame Noor University ۱۹۳۹۵-۴۶۹۷, Tehran, Iran,
Gohar Deilamy-Rad - Department of Chemistry, Payame Noor University ۱۹۳۹۵-۴۶۹۷, Tehran, Iran,

we have developed a colorimetric sensing method for quantitative determination of CN- using Alizarin Red (ALR) as a colorimetric sensor of Al3+ that the resulting interaction (ALR - Al3+ complex) indicated photophysical changes upon the addition of Al3+ among other cations. In the first step, ALR was used for colorimetric detection of Al3+ in aqueous solution by the obvious color change. In the second step the produced ensemble (ALR- Al3+), sensitively and selectively detected a low concentration of CN- via indicator displacement assay system. The colorimetric detection operation is low-cost using ALR and Al3+ ion and has a simple operation without any further modifications. Any enzymatic reactions, separation processes, chemical modifications, and sophisticated instrumentations are also not required in this experiment.

Alizarin Red, colorimetric chemosensor, Al3+ , CN-.