2016-09-01 12:00 - Messages

Bilan du programme de contrôle de la qualité de la numération des fibres – 1992 à 2011

L'exposition aux fibres aéroportées en milieu de travail est mesurée à l'aide d'une technique de numération par microscopie optique à contraste de phase. La numération des fibres comporte un biais et une très grande variabilité qui peuvent être limités par de bonnes pratiques de contrôle de la qualité. Conformément aux exigences des méthodes officielles, québécoise et internationales, les laboratoires (ou les compteurs) effectuant de telles analyses doivent participer à un programme de contrôle de la qualité interlaboratoires sur des échantillons représentatifs de leurs activités afin d'évaluer le degré de fiabilité de leurs résultats.
Le présent rapport propose un bilan du programme de contrôle de la qualité de l'IRSST, de 1992 à 2011, élaboré à partir d'échantillons prélevés dans différents secteurs d'activité québécois (textile, mines, chantiers d'enlèvement de matériaux contenant de l'amiante, freins et démantèlement de fours industriels) et contenant des fibres minérales artificielles (FMA) et de l'amiante (amosite ou chrysotile ou en mixité - chrysotile + FMA ; chrysotile + gypse fibreux).

Source: http://www.irsst.qc.ca/publications-et-outils/publication/i/100890/n/bilan-cq-fibres

Ventilation for Acceptable Indoor Air Quality

ANSI/ASHRAE Standard 62.1-2016
First published in 1973 as Standard 62, Standard 62.1 specifies minimum ventilation rates and other measures for new and existing buildings that are intended to provide indoor air quality that is acceptable to human occupants and that minimizes adverse health effects.
Whereas changes to the 2013 edition of the standard primarily focused on usability and clarity, the 2016 edition includes a major change to the scope of the standard by which residential occupancies are moved from Standard 62.1 to Standard 62.2. Other changes to the 2016 edition include the following:
•A revised definition of "environmental tobacco smoke" (ETS) to include emissions from electronic smoking devices and the smoking of cannabis
•Revised operations and maintenance requirements to better align Standard 62.1 with the requirements in ASHRAE/ACCA Standard 180-2012
•New requirements to the Indoor Air Quality Procedure for determining minimum ventilation rates by considering the combined effects of multiple contaminants of concern on individual organ systems
•A change to explicitly allow environmental health and safety professionals to determine whether a lower air class is appropriate for a particular laboratory exhaust system
•A change to allow ventilation to be reduced to zero through the use of occupancy sensors for spaces of selected occupancy types
•Changes related to demand control ventilation to make clear that the standard is intended to be used for calculations for code review and also for physical operation

Source: https://www.ashrae.org/resources--publications/bookstore/standards-62-1--62-2

Envoyé: 2016-09-21 8:30 par Maryse Gagnon | avec aucun commentaire
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Needs and Opportunities to Enhance Substitution Efforts within the Context of REACH

In order to improve current working practices in the EU in identifying, evaluating and adopting safer alternatives and to more broadly enhance support for substitution among Member States and the European Commission, ECHA commissioned the Lowell Center for Sustainable Production to undertake a landscape analysis of current capacity and needs. The goal of this project is to identify specific priorities that ECHA and other public authorities could support in the near term in order to advance substitution programs and practices among Member States. A review of select applications for authorisation and restrictions proposals, in addition to surveys and interviews involving industry, Member State and Commission authorities, and NGOs were undertaken to obtain critical insights needed for this research.

Source: https://echa.europa.eu/documents/10162/13630/substitution_capacity_lcsp_en.pdf/2b7489e1-6d96-4f65-8467-72974b032d7b

Association Between Kidney Cancer and Occupational Exposure to Trichloroethylene

Objective: This study investigates the association between occupational exposure to trichloroethylene (TCE) and kidney cancer, as this correlation has been questioned.
Methods: The incidence of cancers was studied in a dynamic cohort of 997 male workers who for many years had been occupationally exposed to TCE.
Results: During a 50-year observation period, 13 cases of kidney cancer were observed (7.5 expected) with a standardized incidence ratio of 1.7 and a 95% confidence interval of 1.0 to 3.0. Four other cases, not included in the SIR analysis, were also observed. Long-term TCE exposure was positively confirmed for 14 of the 17 incident cases. There is reason to assume that the remaining cases also had been exposed to TCE.
Conclusions: The present study supports the view that TCE is a kidney carcinogen.

Source: Buhagen, Morten; Grønskag, Anna; Ragde, Siri Fenstad; Hilt, Bjørn. Journal of Occupational & Environmental Medicine: September 2016, Volume 58, Issue 9, p. 957-959.

Research to Practice Implications of High-Risk Genotypes for Beryllium Sensitization and Disease

Objective: Beryllium workers may better understand their genetic susceptibility to chronic beryllium disease (CBD) expressed as population-based prevalence, rather than odds ratios from case-control studies.
Methods: We calculated CBD prevalences from allele-specific DNA sequences of 853 workers for Human Leukocyte Antigen (HLA)-DPB1 genotypes and groups characterized by number of E69-containing alleles and by calculated surface electronegativity of HLA-DPB1.
Results: Of 18 groups of at least 10 workers with specific genotypes, CBD prevalence was highest, 72.7%, for the HLA-DPB1*02:01:02/DPB1*17:01 genotype. Population-based grouped genotypes with two E69 alleles wherein one allele had –9 surface charge had a beryllium sensitization (BeS) of 52.6% and a CBD prevalence of 42.1%.
Conclusions: The high CBD and BeS prevalences associated with –9-charged E69 alleles and two E69s suggest that workers may benefit from knowing their genetic susceptibility in deciding whether to avoid future beryllium exposure.

Source: Kreiss, Kathleen; Fechter-Leggett, Ethan D.; McCanlies, Erin C.; Schuler, Christine R.; Weston, Ainsley. Journal of Occupational & Environmental Medicine: September 2016, Volume 58, Issue 9, p. 855-860.

Breast cancer incidence among female flight attendants

Exposure–response analyses
In a cohort of 6093 female flight attendants, breast cancer incidence was not associated with cumulative exposure to cosmic radiation or two metrics of circadian rhythm disruption. Positive exposure–response relations were observed only in the small subset of the cohort with parity of three or more. Cautious interpretation of the findings in women with high parity is warranted.

Source: Pinkerton LE, Hein MJ, Anderson JL, Little MP, Sigurdson AJ, Schubauer-Berigan MK. Scand J Work Environ Health, 2016.

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