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99m Tc generator / Hydrotalcite / Calcined hydrotalcite / Molybdenum Summary. 99 MoO 4 2− sorption behavior on 3 commercial hydrotalcites, produced by Sasol Chemie, was studied through batch experiments. Only one of them showed high sorption capacity. This product, the MG70 was identified by XRD diffraction analysis as hydrotalcite (Mg 6 Al 2 (OH) 16 CO 3 ·4H 2 O), while the other two, MG50 and MG30, were identified mainly as magnesium aluminum hydroxide hydrate, MgAl 2 (OH) 14 ·3H 2 O. Calcined MG70 (CMG70) was used to retain about 298.17 ± 8.3 mg of 99 Mo-MoO 4 2− (MG70-99 MoO 4 ). When this material was packed in a glass column, the generated 99m Tc was eluted by using NaCl or HNO 3 aqueous solutions. Saline solutions eluted 99m Tc with considerable amounts of 99 Mo while 0.1 M HNO 3 eluted 99m Tc together with a such small amount of 99 Mo that the 99 Mo µCi/ 99m Tc mCi ratios are close to the value recommended by the American Pharmacopeia.

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