2018-06-01 12:00 - Messages

Prévention de l’exposition cutanée aux pesticides chez les producteurs de pommes et facteurs influençant le port des vêtements de protection

Des recherches internationales ont déterminé que la peau constituait la principale voie d'exposition aux pesticides utilisés en agriculture. L'utilisation des équipements de protection individuelle (ÉPI) joue un rôle clé dans la prévention des risques liés à l'exposition. L'utilisation non systématique des ÉPI prescrits est toutefois documentée et constitue une cible prioritaire des interventions pour la réduction de l'exposition aux pesticides. Cette étude approfondit les résultats d'une première enquête auprès des producteurs de pommes en ciblant spécifiquement l'exposition cutanée aux pesticides et l'utilisation des vêtements de protection (VP). Elle a comme objectif de décrire les situations d'exposition lors des activités principales liées à l'utilisation des pesticides et de les mettre en relation avec les perceptions du risque des producteurs, leur utilisation des VP et leurs pratiques de prévention. Les résultats contribuent à l‘avancement des connaissances sur les facteurs qui facilitent ou qui font obstacle à l'utilisation des VP.

Source: http://www.irsst.qc.ca/publications-et-outils/publication/i/100993/n/exposition-cutanee-pesticides-producteurs-pommes-vetements-protection

A Pilot Study of Nanoparticle Levels and Field Evaluation of N95 Filtering Facepiece Respirators on Construction Sites

Little attention has been paid to the generated submicron ultrafine and nanoparticles and their exposure levels on construction jobsites. This information is needed because cytotoxicity of nanoparticles is well known now. In addition, the performance of particulate respirators generally used by construction workers has never been evaluated in field conditions against ultrafine and nano-sized particles. We hypothesized that workers on construction jobsites are exposed to high levels of nanoparticles and current NIOSH-recommended N95 respirators may not provide them adequate protection against aerosolized nanoparticles. Our exposure assessments of ultrafine and nanoparticles on several construction sites using SMPS nanoparticle counters showed that particle mass concentrations ranged between 1.41 and 99.96 μg/m3. The real-time filtration efficiency of N95 respirators against nanoparticles greater than 20.5 nm in aerodynamic diameter was often less than 95%. When surface electrostatic charge was removed in N95 respirators by isopropanol treatment, the filtration efficiency of larger nanoparticles dropped compared to smaller nanoparticles of <27.5 nm sizes.

Source: https://www.cpwr.com/sites/default/files/publications/Adhikari-nanoparticle-study-N95-filtering.pdf

Respirator use and its impact on particulate matter exposure in aluminum manufacturing facilities

Objectives: As part of a large epidemiologic study of particulate health effect, this study aimed to report respirator use among total particulate matter (TPM) samples collected in a major aluminum manufacturing company from 1966‒2013 and evaluate the impact of respirator-use adjustment on exposure estimation.
Methods: Descriptive analyses were performed to evaluate respirator use across facilities and by facility type and job. Protection factors were applied to TPM measurements for recorded respirator use. Estimated TPM exposure for each job ‒ before and after respirator-use adjustment ‒ were compared to assess the impact of adjustment on exposure estimation.
Results: Respirator use was noted for 37% of 12 402 full-shift personal TPM samples. Measured TPM concentration ranged from less than detectable to 8220 mg/m3, with arithmetic mean, median and standard deviation being 10.6, 0.87 and 130 mg/m3, respectively. Respirators were used more often in smelting facilities (52% of TPM measurements) than in fabricating (17%) or refinery facilities (28%) (P<0.01). Sixty-two percent of jobs in smelting facilities were subject to respirator-use adjustment, whereas it was 20% and 70% in fabricating and refinery facilities, respectively. Applying protection factors to TPM measurements significantly reduced estimated job mean TPM exposures and changed exposure categories in these facilities, with larger impact in smelting than fabricating facilities.
Conclusions: Respirator use varied by time, facility and job. Adjusting respirator use resulted in differential impact in smelting and fabricating facilities, which will need to be incorporated into ongoing epidemiologic studies accordingly.

Source: Liu S, Noth E, Eisen E, Cullen MR, Hammond K. (2018). Scand J Work Environ Health
http://dx.doi.org/10.5271/sjweh.3735

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