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

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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.
Item Type:Article
Copyright:© 2005 American Chemical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/53104
Official URL:http://dx.doi.org/10.1021/es050231b
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