Liquid chromatographic separation of zinc isotopes was attempted in the breakthrough manner using benzo-15-crown-5 resin as column packing material at 313 K, and a 20 m long development was successfully achieved. The value of the single-stage separation factor was 1.00035 for the 66Zn/64Zn isotopic pair, 1.00047 for 67Zn/64Zn pair, and 1.00060 for the 68Zn/64Zn pair, which were equivalent to those obtained by a 5 m long chromatographic experiment under the same conditions. Contrary to this, the HETP value was 0.19 cm at the 20m development while it had been 0.09 cm at the 5 m development. Connecting separation columns with polytetrafluoroethylene tubes not packed with the resin may be responsible for this migration distance dependence of the HETP.
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Fukuda et al. (2006) studied this question.
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