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Exposure to carbon nanotube material: aerosol release during the handling of unrefined single-walled carbon nanotube material.

Authors
Maynard-AD; Baron-PA; Foley-M; Shvedova-AA; Kisin-ER; Castranova-V
Source
J Toxicol Environ Health, A 2004 Jan; 67(1):87-107
NIOSHTIC No.
20024242
Abstract
Carbon nanotubes represent a relatively recently discovered allotrope of carbon that exhibits unique properties. While commercial interest in the material is leading to the development of mass production and handling facilities, little is known of the risk associated with exposure. In a two-part study, preliminary investigations have been carried out into the potential exposure routes and toxicity of single-walled carbon nanotube material (SWCNT)-a specific form of the allotrope. The material is characterized by bundles of fibrous carbon molecules that may be a few nanometers in diameter, but micrometers in length. The two production processes investigated use-transition metal catalysts, leading to the inclusion of nanometer-scale metallic particles within unrefined SWCNT material. A laboratory-based study was undertaken to evaluate the physical nature of the aerosol formed from SWCNT during mechanical agitation. This was complemented by a field study in which airborne and dermal exposure to SWCNT was investigated while handling unrefined material. Although laboratory studies indicated that with sufficient agitation, unrefined SWCNT material can release fine particles into the air, concentrations generated while handling material in the field were very low. Estimates of the airborne concentration of nanotube material generated during handling suggest that concentrations were lower than 53 microg/m(3) in all cases. Glove deposits of SWCNT during handling were estimated at between 0.2 mg and 6 mg per hand.
Keywords
Exposure-assessment; Exposure-levels; Exposure-methods; Toxic-effects; Metallic-dusts; Laboratory-testing; Particulate-dust; Particulates; Aerosols; Nanotechnology
Contact
Andrew D. Maynard, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, Cincinnati, OH 45226, USA
CODEN
JTEHD6
CAS No.
7440-44-0
Publication Date
20040109
Document Type
Journal Article
Email Address
amaynard@cdc.gov
Fiscal Year
2004
NTIS Accession No.
NTIS Price
Issue of Publication
1
ISSN
0098-4108
NIOSH Division
HELD; DART
Priority Area
Disease and Injury: Asthma and Chronic Obstructive Pulmonary Disease
Source Name
Journal of Toxicology and Environmental Health, Part A: Current Issues
State
OH; TX; WV
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