In this study, a new ion-selective electrode for Ba2+ is described, illustrating 3-deoxy-D-erythro-hexos-2-ulose bis (thiosemicarbazone) (DHUT) in a poly (vinylchloride) (PVC) membrane with benzyl acetate (BA) as a plasticizer and sodium tetraphenyl borate (NaTPB) as an anionic additive. This sensor presented very good selectivity and sensitivity towards the Ba2+ ions over a wide variety of cations, including alkali, alkaline earth, transition and heavy metal ions. The electrode revealed a great improvement in the selectivity coefficients for the Ba2+ ions in comparison with the formerly reported Ba2+ sensors. The proposed electrode exhibited a significantly enhanced response towards the Ba2+ ions across the concentration range 1.0 x 10(-6)-1.0 x 10(-2) M for the pH variation from 2.6 to 11 with a lower detection limit of 5.6 x 10(-7) M. Moreover, the sensors displayed the Nernstian slope of 29.6 +/- 0.5 mV per decade, havinga fast response time within 15 s over the entire concentration range. It could also be used for at least 2 months with no potential divergence. As a result, the developed sensor was successfully lied to the direct barium ion determination in solutions, rock samples and as an indicator electrode in the Ba2+ ion potentiometric titration with EDTA. (C) 2009 Elsevier B.V. All rights reserved.