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- [25] Determination of trace amount of tin in iron and steel by pre-column derivatization/reversed-phase high-performance liquid chromatography with 2-(5-bromo-2-pyridylazo)-5-(N-n-propyl-N-sulfopropylamino)phenol TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN, 2004, 90 (10): : 795 - 800