NEUTRAL 1,4-BIS(3-THIAPENTYLXANTHATO)BUTANE AS SENSING MATERIAL FOR SAMARIUM(III) ION

Membrane-coated carbon rod electrodes were constructed by incorporatin g 1,4-bis(3-thiapentylxanthato)butane as the active ionophore. These e lectrodes exhibited near Nernstian responses with a slope of 19.7 mV p er decade of concentration change, toward samarium(III) ion. The obser ved detection limit for determination of Sm(III) was 5x10(-7) M (1M=1 mol dm(-3)) in aqueous solutions. The selectivity coefficients of the electrode against a number of diverse ions are discussed.