Radium analysis by sector field ICP-MS in combination with the Diffusive Gradients in Thin Films (DGT) technique
Leermakers, M.; Gao, Y.; Navez, J.; Poffijn, A.; Croes, K.; Baeyens, W. (2009). Radium analysis by sector field ICP-MS in combination with the Diffusive Gradients in Thin Films (DGT) technique. J. Anal. At. Spectrom. 24(8): 1115-1117. https://dx.doi.org/10.1039/B821472G
In: Journal of Analytical Atomic Spectrometry. Royal Society of Chemistry: London. ISSN 0267-9477; e-ISSN 1364-5544, more
A new and simple method to assess low radium concentrations in water and sediment porewater was developed. The 226Ra ions are trapped on a laboratory prepared MnO2 resin (3 other ones have also been tested) that is inserted in a DGTprobe (diffusive gradients in thin films). The probe can be deployed for days to weeks sufficient to accumulate enough 226Ra to be quantified. Because the High Resolution ICP-MS was operated in low resolution mode to get the highest sensitivity, isobaric interference from the Sr88Ba138 molecular ion could not be avoided. However, the pre-concentration on the MnO2 resin favours 226Ra accumulation versus that of Ba and Sr. The instrumental repeatability on a standard of 2 ng L-1226Ra was 1.4% (n = 10), while the relative standard deviation on natural samples was 8% (average of 2.2 pg L-1226Ra, n = 3). A detection limit as low as 0.022 pg L-1226Ra (0.80 mBq L-1) was achieved for a 24 h DGT deployment.
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