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\bibitem{Chakravorty+VanGrieken1982} {\textquotedblleft}\textit{Co-precipitation with iron hydroxide and X-ray fluorescence analysis of trace metals in water}{\textquotedblright}. Chakravorty R, Van Grieken R, International journal of environmental analytical chemistry \textbf{11}, 67 (1982).   http://doi.org/10.1080/03067318208071563

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