Earlier work-related lung and nasal cancer studies included estimates of exposures to different nickel species in the refinery.
Based on the metallurgy, only insoluble nickel was believed to be present around the roasters but mixed exposure was assumed in most areas, including the tankhouse.
Occasional leaching tests of samples from the roaster area have indicated the presence of soluble nickel.
This study reports on five parallel sets of dust samples collected from different floors with standard equipment and treated as follows.
Two sets were leached with an ammonium citrate buffer at pH 4.4. Undissolved material was treated with HClO4/HNO3, evaporated to dryness and dissolved in HCI.
Ni, Cu, Co, Fe, Se, and As were determined in both fractions.
Water soluble Ni was found in all samples, ranging from 5-35%. Sulfate in the solutions correlated nearly stoichiometrically to the total metal content.
The three remaining sets were investigated by, respectively, differential leaching, X-ray diffraction and scanning electron microscopy.
The percentage of soluble nickel found by differential leaching corresponded well with those obtained by the simplified procedure.
X-Ray diffraction analysis showed the presence of NiSO4.6H2O as well as oxides of Ni and Cu.
This study indicates mixed exposures also in the roaster area.
It also clearly indicates that basing exposure on the metallurgy alone can lead to serious misjudgements. (...)
Mots-clés Pascal : Poussière, Industrie métallurgique, Nickel, Prélèvement, Lieu travail, Exposition professionnelle, Médecine travail, Homme, Spéciation, Fusion minerai, Grillage minerai, Poste travail, Travailleur, Analyse qualitative, Analyse chimique, Air
Mots-clés Pascal anglais : Dust, Metallurgical industry, Nickel, Samplings, Work place, Occupational exposure, Occupational medicine, Human, Speciation, Smelting, Roasting, Workplace layout, Worker, Qualitative analysis, Chemical analysis, Air
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0280920
Code Inist : 002B03L03. Création : 27/11/1998.