Publication Details (including relevant citation information):
Arrigo, L.M.; Galenas, M.; Kannan, R.; Katti, K.V.; Jurisson, S.S. Phosphinimines as selective extractants for Tc-99 pertechnetate. Radiochimica Acta 2008 (96) 175-181.
The triphenylphosphiniminium cation (Ph3P= NH2+) was evaluated for its selectivity for the pertechnetate anion ((TcO4-)-Tc-99) using both solvent extraction and solid phase extraction methods. The solid phase extraction of TcO4- using trimethyl silyl -protected triphenylphosphinimine coated silica gel demonstrated the selectivity of the triphenylphosphiniminium cation for TcO4- over a variety of inorganic (NO3-, Cl-, H2PO4-, HSO4-/SO42- ) and organic (fumarate) anions in aqueous solution (> 98% extracted when at pM TcO4- VS. 0.15 M anion). Iodide, lactate, benzoate and acetate were able to compete with pertechnetate (only 11-83% extracted) when present in large excess (0.15 M anion vs. 10(-12) M (TcO4-)-Tc-99m), but not when the anion was present in a 10-fold excess. The triphenylphosphiniminium cation was significantly selective for TcO4- over ReO4-, a commonly used non-radioactive analog for Tc-99, when tracer amounts of both competed with the anions iodide, lactate, benzoate and acetate.
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