Documents Clerc, Frédéric 4 results

"Cet article présente les données d'exposition, issues de la base COLCHIC, aux composés organiques volatils (COV) les plus fréquemment mesurés entre 2003 et 2010 et faisant l'objet d'une valeur limite d'exposition professionnelle (VLEP).Les neuf agents cancérogènes, mutagènes, reprotoxiques (CMR) avérés ou suspectés selon la classification européenne ou le Centre international de recherche sur le cancer (CIRC) les plus couramment mesurés sont tout d'abord identifiés : le toluène, le styrène, le formaldéhyde, l'éthylbenzène, le dichlorométhane, le n-hexane, le tétrachloroéthylène, le trichloroéthylène et le benzène.Dans un second temps, dix autres COV faisant l'objet d'une VLEP sans être classés CMR sont identifiés selon un découpage des données par scénarios d'exposition, afin de mettre en exergue les spécificités de différents contextes professionnels français - secteur d'activité, métier ou tâche.Dans les deux cas, les indicateurs de l'exposition présentés sont les descripteurs statistiques courants, complétés par l'indice d'exposition et la tendance au fil des huit années d'étude (2003-2010)."

"From November 2009 to October 2010, the French general directorate for labor organized a large field-study using analytical transmission electron microscopy (ATEM) to characterize occupational exposure to asbestos fibers during work on asbestos containing materials (ACM). The primary objective of this study was to establish a method and to validate the feasibility of using ATEM for the analysis of airborne asbestos of individual filters sampled in various occupational environments. For each sampling event, ATEM data were compared to those obtained by phase-contrast optical microscopy (PCOM), the WHO-recommended reference technique. A total of 265 results were obtained from 29 construction sites where workers were in contact with ACM. Data were sorted depending on the combination of the ACM type and the removal technique. For each "ACM-removal technique" combination, ATEM data were used to compute statistical indicators on short, fine and WHO asbestos fibers. Moreover, exposure was assessed taking into account the use of respiratory protective devices (RPD). As in previous studies, no simple relationship was found between results by PCOM and ATEM counting methods. Some ACM, such as asbestos-containing plasters, generated very high dust levels, and some techniques generated considerable levels of dust whatever the ACM treated. On the basis of these observations, recommendations were made to measure and control the occupational exposure limit. General prevention measures to be taken during work with ACM are also suggested. Finally, it is necessary to continue acquiring knowledge, in particular regarding RPD and the dust levels measured by ATEM for the activities not evaluated during this study."