NDLI: Chemical speciation and sequential extraction of Mn in workroom aerosols: analytical methodology and results from a field study in Mn alloy plants

Content Provider	Royal Society of Chemistry (RSC)
Author	Ellingsen, Dag G. Hetland, Siri Sand, Gunhild Thomassen, Yngvar
Copyright Year	2001
Abstract	Workers in the Mn alloy producing industry are exposed to aerosols containing a variety of Mn compounds (MnO, MnO2, Mn2O3, Mn3O4, FeMn and SiMn). This paper reports a novel four-step chemical speciation/fractionation procedure developed for characterisation of workroom aerosols collected in Mn alloy producing plants. The following components of the aerosol have been quantified: "water soluble" Mn dissolved in 0.01 M ammonium acetate; Mn0 and Mn2+ dissolved in 25% acetic acid; Mn3+ and Mn4+ dissolved in 0.5% hydroxylamine hydrochloride in 25% acetic acid; and “insoluble” Mn digested in aqua regia and hydrofluoric acid. Dissolution of pure Mn compounds with well-defined stoichiometries were essentially complete in the respective leaching steps with detectable amounts of <1% in others. Recoveries of a mixed quality control sample were also acceptable in the range 92–97% for the different oxidation states. The levels measured in the inhalable and respirable fractions in three Mn alloy producing plants were approximately 300 and 35 µg m−3 of total Mn, respectively. The most obvious feature of the speciation results is that none of the work areas is characterised by a single Mn contaminant. The predominant oxidation states in the inhalable aerosol fraction are Mn0 and Mn2+ independent of job functions/departments. The occurrence of insoluble Mn compounds in both the inhalable and respirable aerosol fractions is significantly higher during production of SiMn.
Starting Page	555
Ending Page	559
Page Count	5
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	3
Issue Number	6
Journal	Journal of Environmental Monitoring
DOI	10.1039/b104479f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Speciation Aerosol Ammonium Acid Hydroxylammonium chloride Aqua regia
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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