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. 2021 Feb 5;11(2):409.
doi: 10.3390/nano11020409.

Carbon Nanotubes: Probabilistic Approach for Occupational Risk Assessment

Andrea Spinazzè  1 , Carolina Zellino  1 , Francesca Borghi  1 , Davide Campagnolo  1 , Sabrina Rovelli  1 , Marta Keller  1 , Giacomo Fanti  1 , Andrea Cattaneo  1 , Domenico M Cavallo  1
Affiliations

Carbon Nanotubes: Probabilistic Approach for Occupational Risk Assessment

Andrea Spinazzè et al. Nanomaterials (Basel). .

Abstract

In this study, the occupational risk assessment of carbon nanotubes (CNTs) was performed by means of a probabilistic approach. Chronic and subchronic inhalation exposure studies were retrieved during the hazard identification phase of the study. These studies were then used to obtain a guidance value (BMCh, expressed as a lognormal distribution with geometric mean ± geometric standard deviation = 10.0 ± 4.2 µg/m3) for occupational inhalation exposure to CNTs. An exposure scenario was selected from the scientific literature: three different work events (WEs) related to the production of conductive films were considered: (WE1) manufacturing of single walled carbon nanotubes films during normal operation using local exhaust ventilation (LEV); (WE2) manufacturing of SWCNT film without LEV; and (WE3) cleaning of one of the reactors. For each WE, a probability distribution function was applied, considering exposure expressed as mass concentration, as derived from three different measurement techniques. The ratio of the exposure and the BMCh distributions (i.e., the risk characterization ratio-RCR) was used to calculate the probability of occurrence of a relevant occupational risk. All the considered WEs indicated the presence of a risk (i.e., RCR distributions ≥ 1); however, only WE2 resulted in a statistically significant level of risk.

Keywords: MWCNTs; SWCNTs; engineered nanomaterials; nanotechnology; occupational exposure; occupational health.

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Conflict of interest statement

The authors declare no conflict of interest.

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