title: Mercury in dumped blast furnace sludge.
abstract: Blast furnace sludge (BFS) is a waste generated in the production of pig iron and was dumped in sedimentation ponds. Sixty-five samples from seven BFS locations in Europe were investigated regarding the toxic element mercury (Hg) for the first time. The charge material of the blast furnace operations revealed Hg contents from 0.015 to 0.097mgkg(-1). In comparison, the Hg content of BFS varied between 0.006 and 20.8mgkg(-1) with a median of 1.63mgkg(-1), which indicates enrichment with Hg. For one site with a larger sample set (n=31), Hg showed a stronger correlation with the total non-calcareous carbon (C) including coke and graphite (r=0.695; n=31; p<0.001). It can be assumed that these C-rich compounds are hosting phases for Hg. The solubility of Hg was rather low and did not exceed 0.43% of total Hg. The correlation between the total Hg concentration and total amount of NH4NO3-soluble Hg was relatively poor (r=0.496; n=27; p=0.008) indicating varying hazard potentials of the different BFS. Finally, BFS is a mercury-containing waste and dumped BFS should be regarded as potentially mercury-contaminated sites.
authors.affiliation: Department of Geosciences, Soil Geography/Soil Science, University of Cologne, D-50923 Köln, Germany.
authors.forename: Corinna
authors.initials: C
authors.lastname: Földi
authors.affiliation: Bundesanstalt für Geowissenschaften und Rohstoffe (BGR)/Landesamt für Bergbau, Energie und Geologie (LBEG), Stilleweg 2, D-30655 Hannover, Germany.
authors.forename: Reiner
authors.initials: R
authors.lastname: Dohrmann
authors.affiliation: Department of Geosciences, Soil Geography/Soil Science, University of Cologne, D-50923 Köln, Germany. Electronic address: tim.mansfeldt@uni-koeln.de.
authors.forename: Tim
authors.initials: T
authors.lastname: Mansfeldt
mesh_terms: D005060:Europe; D015386:Hazardous Substances / Q000032:analysis*; D007220:Industrial Waste / Q000032:analysis*; D008628:Mercury / Q000032:analysis*; D008669:Metallurgy / Q000379:methods*; D012037:Refuse Disposal / Q000379:methods
chemical_list: D015386:Hazardous Substances; D007220:Industrial Waste; D008628:Mercury
keywords: Blast furnace sludge; Coke; Iron ores; Mercury; Solubility