Di-tert-butyldibenzo-18-crown-6 ether (CE) dissolved in a mixture of isodecyl alcohol and n-dodecane has been investigated for separation of technetium from alkaline low level waste (LLW). Technetium present as TcO₄⁻ pairs with sodium ion-crown ether complex formed due to high sodium nitrate concentration in the waste solution results in extraction of TcO₄⁻ by ion-pair formation of the kind Na⁺·CE·TcO₄⁻Stoichiometry of the extracted complex as determined by slope analysis of log–log plot of technetium distribution ratio (D_Tc) vs. the CE concentration suggests a combining ratio of 1 TcO₄⁻ to 1 CE. Extraction of TcO₄⁻ was examined from aqueous phase with varying NaNO₃ and NaOH concentrations. D_Tc was found to increase with increase in Na⁺ concentration having NO3⁻ or OH⁻ as counter ions, however, above 5M concentrations of them, DTc remained constant for NaOH while it decreases for NaNO₃ due to a strong competitive extraction of NO₃⁻ ion compared to OH⁻. Quantitative stripping of TcO₄⁻ was achieved in three consecutive contact of loaded organic with deionized water.