Selective removal of 226Ra2+ from gas-field-produced waters


Leeuwen, Fijs W.B. van and Miermans, Cornelis J.H. and Beijleveld, Hans and Tomasberger, Tanja and Davis, Jeffery T. and Verboom, Willem and Reinhoudt, David N. (2005) Selective removal of 226Ra2+ from gas-field-produced waters. Environmental Science & Technology, 39 (14). pp. 5455-5459. ISSN 0013-936X

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Abstract:The 226Ra2+ selectivity of both the self-assembled (iso)guanosine-based systems and ionizable thiacalix[4]crown dicarboxylic acids was determined in gas-field-produced water and a metal ion-containing model solution (simulant). Seven gas-field-produced water samples have been analyzed. From a sample (K5D) with average metal ion concentrations ([metaltot] = 0.14 M), thiacalix[4]crown-5 dicarboxylic acid (10-4 M) extracts 60% of the 226Ra2+ content. Extractions performed with the model solution (MK5D) indicate that in K5D there is significant competition in 226Ra2+ extraction due to the organic constituents of K5D, in particular with self-assembled extractants guanosine and isoguanosine. Nevertheless, all four extractants extract 226Ra2+ both from the produced water K5D and the model solution MK5D, even with a 100-fold excess of [metaltot] to [extractant]. The extracted 226Ra2+ cations could effectively be stripped from the extractants by washing with pH 2 water. The results obtained with the extractants used, especially thiacalix[4]crown-5 dicarboxylic acid 3, clearly demonstrate the way to selectively remove Ra2+ from gas-field-produced waters.
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Copyright:© 2005 American Chemical Society
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