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Caractérisation des particules nanométriques non intentionnelles émises dans différents milieux de travail
Les particules nanométriques émises non intentionnellement (PNNI) en milieux de travail présentent un potentiel de toxicité pour les travailleurs. Elles montrent une importante capacité de se déposer dans le système respiratoire et se distinguent par leur grande surface spécifique et un potentiel élevé d'inflammation pulmonaire. Cette étude vise à caractériser les PNNI émises dans six milieux de travail à travers un large éventail d'indicateurs. Les concentrations ont été...
Measuring and controlling emissions from polymer filament desktop 3D printers
Affordable desktop 3D printers are being widely used in businesses, schools and colleges. Some of these printers use filaments to deposit polymer through a heated nozzle to build three dimensional objects. This type of desktop printer is generally unenclosed and some published studies have raised concerns that they may release potentially harmful fumes and particles. The scientific evidence base on exposures and potential health endpoints is being developed internationally. This report describes initial research in a laboratory setting to a) measure emissions of particulates and volatile organic...
Assessment of nanofibre dustiness by means of vibro-fluidization
Dustiness testing probes for the propensity of a powdery material to release dust particles following agitation. For high aspect-ratio materials like nanotubes, the most important dust fraction is that of potentially carcinogenic fibres(WHO-fibres).Wedeveloped the fluidizer particularly for fibres thatmakes use of vibro-fluidization in order to effectively disentangle single fibres and agglomerates of multi-walled carbon nanotube powders. Counting rules for morphological characterization of collected particles by means of electron microscopywere established, allowing quantifying the WHO-fibre fraction...
Diesel engine exhaust exposure in underground mines
Comparison between different surrogates of particulate exposure Exposure to diesel particulate matter (DPM) is frequently assessed by measuring indicators of carbon speciation, but these measurements may be affected by organic carbon (OC) interference. Furthermore, there are still questions regarding the reliability of direct-reading instruments (DRI) for measuring DPM, since these instruments are not specific and may be interfered by other aerosol sources. This study aimed to to assess DPM exposure in two underground mines by filter-based methods and DRI; and to assess the relationship between...
NF EN 16897 - Exposition sur les lieux de travail
Caractérisation des aérosols ultrafins/nanoaérosols - Détermination de la concentration en nombre à l'aide de compteurs de particules à condensation La présente Norme européenne fournit des lignes directrices sur le mesurage de la fraction particulaire fine de l'aérosol, notamment pour la détermination de la concentration en nombre des aérosols ultrafins et des nanoaérosols sur les lieux de travail à l'aide de compteurs de particules à condensation (CPC). Source: https://www.boutique.afnor...
Workplace exposure and release of ultrafine particles during atmospheric plasma spraying in the ceramic industry
Atmospheric plasma spraying (APS) is a frequently used technique to produce enhanced-property coatings for different materials in the ceramic industry. This work aimed to characterise and quantify the impact of APS on workplace exposure to airborne particles, with a focus on ultrafine particles (UFPs, < 100 nm) and nanoparticles (< 50 nm). Particle number, mass concentrations, alveolar lung deposited surface area concentration, and size distributions, in the range 10 nm–20 μm were simultaneously monitored at the emission source, in the potential worker breathing zone, and in outdoor...
Workplace Measurements of Ultrafine Particles
A Literature Review Workers are exposed to ultrafine particles (UFP) in a number of occupations. In order to summarize the current knowledge regarding occupational exposure to UFP (excluding engineered nanoparticles), we gathered information on UFP concentrations from published research articles. The aim of our study was to create a basis for future epidemiological studies that treat UFP as an exposure factor. The literature search found 72 publications regarding UFP measurements in work environments. These articles covered 314 measurement results and tabled concentrations. Mean concentrations...
Aérosols semi-volatils
De l'identification au prélèvement Des études récentes concernant les aérosols semi-volatils ont révélé des interactions entre les particules et les vapeurs. Encore faut-il être capable d'identifier le caractère semi-volatil d'une substance pour développer une méthode de prélèvement et d'analyse prenant en compte les deux phases, particulaire et vapeur. Cet article a pour but de donner une définition adaptée de ce qu'est un aérosol semi-volatil et d'appliquer...
IARC Monographs Volume 111: Some Nanomaterials and Some Fibres
This volume of the IARC Monographs contains evaluations of the carcinogenic hazard to humans of fluoro-edenite fibrous amphibole, silicon carbide fibres and whiskers, and carbon nanotubes. None of these agents had been evaluated previously by the Working Group. Source: http://monographs.iarc.fr/ENG/Monographs/vol111/index.php
Characterisation of Exposure to Ultrafine Particles from Surgical Smoke by Use of a Fast Mobility Particle Sizer
Electrosurgery is a method based on a high frequency current used to cut tissue and coagulate small blood vessels during surgery. Surgical smoke is generated due to the heat created by electrosurgery. The carcinogenic potential of this smoke was assumed already in the 1980's and there has been a growing interest in the potential adverse health effects of exposure to the particles in surgical smoke. Surgical smoke is known to contain ultrafine particles (UFPs) but the knowledge about the exposure to UFPs produced by electrosurgery is however sparse. The aims of the study were therefore to characterise...
Mise au point sur les risques toxiques lors de l’utilisation professionnelle des photocopieurs
Les photocopieurs sont considérés comme des outils essentiels dans les entreprises. De plus en plus de salariés se plaignent auprès de leur service de santé au travail de symptômes qu'ils attribuent à leur exposition au photocopieur. Il s'agit donc de connaître les risques liés à cette exposition. Le fonctionnement d'un photocopieur est basé sur l'électrophotographie, c'est-à-dire le transfert électrostatique de la poudre de toner vers une surface photoconductrice chargée électriquement...
Exposure to airborne particles and volatile organic compounds from polyurethane molding, spray painting, lacquering, and gluing in a workshop
Due to the health risk related to occupational air pollution exposure, we assessed concentrations and identified sources of particles and volatile organic compounds (VOCs) in a handcraft workshop producing fishing lures. The work processes in the site included polyurethane molding, spray painting, lacquering, and gluing. We measured total VOC (TVOC) concentrations and particle size distributions at three locations representing the various phases of the manufacturing and assembly process. The mean working-hour TVOC concentrations in three locations studied were 41, 37, and 24 ppm according to photo...
Risk of Preeclampsia From Exposure to Particulate Matter (PM2.5) Speciation Chemicals During Pregnancy
Objective: To determine whether maternal exposure to particulate matter (PM2.5) speciation chemicals during pregnancy is associated with the risk of preeclampsia. Methods: We allocated average daily exposure values for 36 ambient particulate matter speciation chemicals to mothers during their first trimester and their entire pregnancy. The main outcome of interest was preeclampsia occurrence. Adjusted odd ratios and 95% confidence intervals were computed. Results: The odds for preeclampsia were increased per interquartile range increase in pollutants for exposure to elemental carbon during the...
Biological Effects of Emissions From Resistance Spot Welding of Zinc-Coated Material After Controlled Exposure of Healthy Human Subjects
Objective: Do emissions from a resistance spot welding process of zinc-coated materials induce systemic inflammation in healthy subjects after exposure for 6 hours? Methods: Twelve healthy male subjects were exposed once for 6 hours either to filtered ambient air or to welding fume from resistance spot welding of zinc-coated material (mass concentration approximately 100 μg m−3). Biological effects were measured before, after, and 24 hours after exposure. Results: At the concentrations used in this study, however, the suspected properties of ultrafine particles did not lead to systemic...

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