ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 37, Number 8
JKCSEZ 37(8)
April 20, 1993 

Poly(vinyl chloride)(PVC) membrane electrodes based on the lipophilic neutral carrier, dibenzo-18-crown-6(DB18C6) and benzo-15-crown-5 (B15C5) as the active sensors for Tl+ ion have been prepared and tested in different content of the potassium tetrakis(4-chlorophenyl)borate (KTClPB) as lipophilic salt. Dioctyl adipate (DOA), 2-nitrophenyl phenyl ether (NPPE) and o-nitrophenyl actyl ether (NPOE) were used as plasticizing solvent mediators. Electrodes exhibited good linear responses of 40∼55 mV decade-1 for Tl+ ion within the concentration ranges 10-1∼10-5M TlNO3. Selectivity coefficients of interfering ions (alkali metal, alkaline earth metal and some transition metal ions) for Tl+-ISE were determined by separate solution method and were sufficiently small for most of them. These crown ether type ion-selective electrodes are suitable for use with aqueous solution at pH > 3.