Owing to the abundance of sedimentary rock, 65 small-scale quartz manufacturing enterprises, employing 650 workers, have been established in the region studied.
Quartz powder manufacturing involves various processes and operations, such as manual handling of quartz stones, crushing, grinding, sieving, screening, mixing, storing and bagging.
Results demonstrate that each of these operations generates high concentrations of airborne'total'dust and respirable dust, which contain a very high percentage (>75%) free silica.
The estimated average exposure to airborne'total'dust was 22.5 mg m-3 (Permissible Limit of Exposure 1.08 mg m 3), and respirable dust 2.93 mg m 3 (PLE 0.36 mg m-3).
This shows that'total'dust exposure was 7.7 times higher than respirable dust.
Since the present work systems and practices may pose a serious health risk to the workers, public and the environment, suitable preventive and control measures have been suggested for improvement in the workplace.
Mots-clés Pascal : Poussière, Quartz, Inde, Asie, Exposition professionnelle, Médecine travail, Homme, Lieu travail, Concentration maximale admissible, Extraction en carrière, Industrie extractive, Prévention
Mots-clés Pascal anglais : Dust, Quartz, India, Asia, Occupational exposure, Occupational medicine, Human, Work place, Maximum permissible concentration, Quarrying, Mining industry, Prevention
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 99-0411522
Code Inist : 002B03L03. Création : 22/03/2000.