Summary
Aluminium in steel has been gravimetrically determined as phosphate after precipitation at a controlled pH of 3.7–3.9. Iron has been complexed with thioglycollic acid and ammonium thiocyanate. Titanium and zirconium, if present, are removed from the acidic solution with sodium hypophosphite and bromine water. Copper group elements, if present, are removed by passing hydrogen sulphide through the solution. Chromium, vanadium, manganese, nickel and cobalt do not interfere.
Zusammenfassung
Zur Aluminiumbestimmung in Stahl wird ein gravimetrisches Verfahren vorgeschlagen, bei dem Al als Phosphat in einem pH-Bereich von 3,7 bis 3,9 gefällt wird. Eisen wird mit Thioglykolsäure und Ammoniumthiocyanat maskiert. Titan und Zirkonium werden aus saurer Lösung mit Natriumhypophosphit und Bromwasser ausgefällt. Elemente der Kupfergruppe werden mit Hilfe von Schwefelwasserstoff entfernt. Chrom, Vanadium, Mangan, Nickel und Kobalt stören nicht.
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Thanks to Dr. G. P. Chatterjee, Chief Metallurgist, Durgapur Steel Plant, for his constant encouragement and inspiration in this Une of work. Thanks also to Dr. M. M. Chakrabartty, Senior Chemist, Durgapur Steel Plant, for revising the manuscript and offering valuable suggestions.
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Ray, H.N., Biswas, S.S. & Ray, S. Determination of aluminium in steel. Z. Anal. Chem. 228, 114–119 (1967). https://doi.org/10.1007/BF00504013
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DOI: https://doi.org/10.1007/BF00504013