High pressure chromatography for removal of trace amount of aqueous boron. An improvement in dynamic adsorption capacity

With a goal to facilitate removal of trace amounts of radioisotopes dissolved in water, we conducted column chromatographic experiments with an anion-exchanger at high pressures up to 19 MPa at 5 and 25degC to recover stable boron isotopes, as a substitute for radioisotopes, from its 0.10 mmol L-1 solution. The results showed that the dynamic adsorption capacity, q, increased with increasing pressure and decreasing temperature. The largest q value obtained was 2.33 mmol g-1 at 19 MPa(5degC), 1.7 times larger than that at the standard temperature and pressure. This indicates that the chromatographic technique to purify waters contaminated by trace amounts of toxic solutes can be improved by controlling pressure and temperature. (author)