Abstract by Wai Ning Chan
Wai Ning Chan
Chemistry and Biochemistry
Preconcentration and Separation of Perrhenate by Ion Exchange Chromatography
Technetium is one of the environmental hazards due to its long half-life and radioactivity and it exists usually in form of pertechnetate. Perrhenate is always used as alternative of technetium because it is radioinactive but it has similar chemical properties especially the retention time in HPLC. In this research, a new zinc cyclen resorcinarene cavitand (ZCR) column was used in ion chromatography (IC) to separate perrhenate. IC has the benefit of requiring almost no sample preparation for water samples. The ZCR column demonstrated its ability on separating general anions: fluoride, chloride, nitrate, sulphate, phosphate, perchlorate, and perrhenate by gradient 2-60 mM NaOH. It also gave an excellent linear range from 2 ppm to 1000 ppm for perrhenate with R2 > 0.997. It was found that there was a logarithmic relationship between the concentration of perrhenate and the retention time. The column was also able to preconcentrate perrhenate with recoveries of 93% when 1 ppm of perrhenate was injected 10 times. In conclusion, the new ZCR column can separate general anions and can retain and preconcentrate perrhenate and has the potential in pertechnetate separations.