A novel approach for preferential recovery of Sr from (Sr, Th)O2

► A novel approach for preferential leaching of Sr(II) from (Th,Sr)O2. ► Kd of Sr(II), Th(IV), Zr(IV), Y(III), Pd(II), Eu(III) and Cs(I) in DTBCH18C6. ► Purification of Sr(II) from Th(IV), Eu(III) and Cs(I) using DTBCH18C6 in HClO4. ► Possible application of the data in reducing the hazardousness of high level waste. ► Possibility of recovery of 90Y, wealth from nuclear waste.