%0 Conference Proceedings %T Selective Polymeric Membrane Sensor for Determining Lanthanum(III) Based on 4\',4\'\'(5\'\')-Di-tert-butyldibenzo-18-crown-6 as Ionophore %A Z. Ilkhani %A M. Mohajeri %A Ronaghi, Gholam Hossein %A S. Akbari %J نوزدهمین سمینار شیمی تجزیه ایران %D 2013