%0 Journal Article %T An optical sensor for determination of low pH values based oncovalent immobilization of Congo red on triacetyl cellulose films viaepichlorohydrin %A Salmani Golkhatmi, Mohammad %A Ronaghi, Gholam Hossein %A CHamsaz, Mahmod %J Sensors and Actuators B: Chemical %@ 0925-4005 %D 2018