Immobilize of methyl orange indicator on triacetylcellulose film
and activation of these triacetylcellulose membranes were performed
according to a method reported previously [10]. The transparent
membrane cuts into pieces with suitable size and stored in
water. The triacetylcellulose membranes were transferred to commercial
sodium hypochlorite solution for several seconds in order
to remove colored gelatinous layers. The membranes were washed
by using water and detergent