Selenium in electrolytic manganese as a reference material for the quality control of aluminium melts |
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Authors: | N Etxebarria G Arana R Antolín G Borge T Posada J C Raposo |
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Institution: | (1) Kimika Analitikoaren Saila, Euskal Herriko Unibertsitatea, 644 PK, 48080 Bilbao, Spain;(2) Bostlan S.A., Polígono Industrial Trobika, 143 PK, 48100 Mungia, Spain |
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Abstract: | Electrolytic manganese is an important alloying element for aluminium and steel melts. It is mainly added to melts of aluminium
in the holding furnace as tablets or minitablets (compressed compacts of manganese and aluminium powders). Selenium derivates
are usually added during the production of electrolytic manganese, so some selenium is present in the alloys produced when
electrolytic manganese is added to the aluminium furnace. Since the selenium contents of many alloys are of concern from health
and environmental perspectives, their values should be provided. In this work, a laboratory reference material (LRM) based
on electrolytic manganese was produced to assure our routine quality control method, where selenium is analysed by hydride
generation followed by optical emission spectrometry with inductively coupled plasma (HG–ICP–OES). Therefore, the present
paper describes in detail the preparation procedure for and the results from homogeneity and stability studies performed on
electrolytic manganese LRM. For this purpose, a commercial electrolytic manganese lot was selected and the main factors involved
in the preparation of the material (pretreatment step, homogenization, bottling and storage) were carefully studied and established
in order to guarantee the long-term stability of the LRM. The results obtained showed that the LRM developed was a fit-for-purpose
material for the quality control of the routine analysis of selenium. |
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Keywords: | Electrolytic manganese Compacts Aluminium alloying Reference material |
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