ILO Home
Go to the home page
Site map | Contact us Franšais | Espa˝ol

CISDOC database

Document ID (ISN)111853
CIS number 11-0536
ISSN - Serial title 0019-8366 - Industrial Health
Year 2011
Convention or series no.
Author(s) Kakooei H., Hormozy M., Marioryad H.
Title Evaluation of asbestos exposure during brake repair and replacement
Bibliographic information 2011, Vol.49, p.374-380. Illus. 23 ref.
Internet access Evaluation_of_asbestos.pdf [in English]
Abstract Occupational exposure to asbestos fibres among automobile brake repair mechanics has seldom been evaluated in Iran. This study evaluated asbestos fibre concentrations in the breathing zone of auto mechanics between July 2008 and December 2008. The asbestos fibre concentrations of 60 personal air samples collected from 30 car and trucks brake replacement mechanics were analyzed by phase-contrast optical microscopy and scanning electron microscopy (SEM) by energy-dispersive X-ray analysis. The geometric means of the personal monitoring fibre concentrations were 0.92 fibres/ml and 0.46 fibres/ml respectively in car and heavy truck auto shops. Based on these findings, auto mechanics who worked with asbestos-containing brake linings may have been exposed to asbestos concentrations approximately seven times higher than the current OSHA permissible exposure limit (PEL) of 0.1 fibres/ml. Fiber morphology and energy dispersive X-ray analysis by SEM revealed that amphibole fibres such as tremolite and actinolite existed in the brake dusts and that the vast majority of the airborne chrysotile fibres were greater than 1 μm in diameter. It can be concluded that the imported chrysotile asbestos contains trace amounts of tremolite and actinolite fibres and they are responsible for the high airborne asbestos levels and occupational exposure to amphibole asbestos among auto mechanics. Thus, it is to be expected that the auto mechanics will suffer negative health effects due to exposure to the serpentine and amphibole asbestos fibres.
Descriptors (primary) Iran, Islamic Republic of; asbestos; brake linings; service stations and repair shops; exposure evaluation
Descriptors (secondary) breathing atmosphere; chrysotile; amphibole; actinolite; tremolite; airborne dust; personal sampling; scanning electron microscopy; phase-contrast microscopy; fibre counts; determination in air
Document type D - Periodical articles
Subject(s) Metal production and metalworking
Toxic and dangerous substances
Broad subject area(s) Chemical safety
Browse category(ies) Motor vehicle manufacturing industry