Physicochemical characterisation of different welding aerosols.
Summary of "Physicochemical characterisation of different welding aerosols."
Physicochemical properties important in exposure characterisation of four different welding aerosols were investigated. Particle number size distributions were determined by scanning mobility particle sizer (SMPS), mass size distributions by separation and weighing the individual size fractions of an 11-stage cascade impactor. The size distribution of the primary particles of agglomerates, chemical composition and morphology of the particles were examined by TEM. There were significant differences in the particle number size distributions of the different welding aerosols according to the SMPS determinations. The particle mass size distributions determined gravimetrically were, however, not really different. The dominant range with respect to mass was between 0.1 and 1 μm, regardless of the welding technique. Most of the primary particles in all different welding aerosols had diameters between 5 and 40 nm. All types of primary particles had a tendency to form chainlike agglomerates. A clear size dependence of the particle chemical composition was encountered in the case of manual metal arc welding aerosol. Small particles with diameters below 50 nm were mostly metal oxides in contrast to larger particles which also contained more volatile elements (e.g. potassium, fluorine, sodium, sulphur).
National Institute of Occupational Health, P.O. Box 8149 Dep., 0033, Oslo, Norway, email@example.com.
This article was published in the following journal.
Name: Analytical and bioanalytical chemistry
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20845032
- DOI: http://dx.doi.org/10.1007/s00216-010-4185-7
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Medical and Biotech [MESH] Definitions
A form of pneumoconiosis resulting from inhalation of iron in the mining dust or welding fumes.
Physical reactions involved in the formation of or changes in the structure of atoms and molecules and their interactions.
Colloids with a gaseous dispersing phase and either liquid (fog) or solid (smoke) dispersed phase; used in fumigation or in inhalation therapy; may contain propellant agents.
The physical phenomena describing the structure and properties of atoms and molecules, and their reaction and interaction processes.