Analytical and Bioanalytical Electrochemistry is an international scientific journal published online by the Center of Excellence in Electrochemistry at the University of Tehran, Tehran, Iran. The journal was published quarterly from 2009 to 2011, bimonthly from 2011 to 2018, and has been published in at least eight issues per year since 2018. Analytical and Bioanalytical Electrochemistry - 15 1 2023 01 31 Trace Amounts Determination of Barium Ions by a New Ion-Selective Electrode based on 4ʹ,4ʺ(5ʺ)-Di-Tert-Butyldibenzo-18-Crown-6 47 56 701482 10.22034/abec.2023.701482 EN Farhang Mizani Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin, Iran 0000-0002-8027-1278 Sorur Saffari Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Iran Mahmood Paiehghadr Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Iran Journal Article 2022 11 20 A poly(vinyl chloride) membrane sensor for barium was prepared using 4ʹ,4ʺ(5ʺ)-Di-tert-butyldibenzo-18-crown-6 (DTB 18C6) as an ion carrier. The optimized membrane with PVC:DOP:DTB18C6:KTCPB percent ratio of 33:60:5:2 led to a Nernstian calibration slope of 25.23 mV per decade, from 1×10^-7to 1×10^-1M . Dioctyl phthalate was found to act as the best plasticizer in terms of controlling the response and durability of the sensor the lifetime of the fabricated sensor. The sensor had a short response time of 18 s and its response was independent from pH from 2.0 to 12.4 working pH ranges. The selectivity behavior of the sensor for barium in the presence of alkali, alkaline earth, transition and heavy metal ions was very good. The applicability of the sensor was evaluated through using it as an indicator in the potentiometric titration of SO₄^2- ions. https://www.abechem.com/article_701482_14e2476e83811b5544526734202b0eae.pdf