[en] Q values are reported for (d,t) reactions on all the stable isotopes of zirconium. The neutron separation energies of ⁹⁴Zr and ⁹⁶Zr differ greatly (by 27.5 and 22.1 keV, respectively) from the values in the 1971 Atomic Mass Evaluation. These results combined with those from other authors seem to indicate that the 1971 values for the masses of ⁹³Zr and ⁹⁵Zr are in error. (orig.)