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Simultaneous determination of traces of impurities in high-purity molybdenum and molybdenum trioxide by coprecipitation and inductively coupled plasma-atomic emission spectrometry
Authors:Osamu Kujirai  Kei Yamada  Muneyuki Kohri and Haruno Okochi
Institution:(1) National Research Institute for Metals, Nakameguro, Meguro-ku, 153 Tokyo, Japan
Abstract:Summary Inductively coupled plasma-atomic emission spectrometry (ICP-AES) has been developed for a simultaneous determination of traces of non-hydride-forming elements in high-purity Mo and molybdenum trioxide. Coprecipitation of diverse elements with lanthanum hydroxide is used to separate them from the Mo matrix and for concentration. Effects of pH and amount of La on the recoveries of diverse elements are discussed. Ten elements (Co, Cr, Cu, Fe, Mn, Ni, Ti, V, Zn, and Zr) are quantitatively recovered and determined. Matrix-matched calibration solutions are used for the determination.
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