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\bibitem{VanGrieken_etal1977} {\textquotedblleft}\textit{Chelex-100 ion-exchange filter membranes for preconcentration in x-ray-fluorescence analysis of water}{\textquotedblright}. Van Grieken RE, Bresseleers CM, Vanderborght BM, Analytical chemistry \textbf{49}, 1326 (1977).   http://doi.org/10.1021/AC50017A011

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