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Document ID (ISN)107309
CIS number 07-1380
ISSN - Serial title 0303-7657 - Revista brasileira de saúde ocupacional
Year 2005
Convention or series no.
Author(s) Rodrigues G.L., Mantovani L.E., Duarte U., Lopes K.
Title Comparative study of breathable dust generated by basalt and gneiss during stone-crushing in the regions of Londrina and Curitiba, in the state of Paraná, and its impact on workers
Original title Estudo comparativo entre as poeiras respiráveis de basalto e gnaisse na produção de brita nas regiões de Londrina e Curitiba, no estado do Paraná, e sua influência para os trabalhadores [in Portuguese]
Bibliographic information 2005, Vol.30, No.112, p.37-47. Illus. 30 ref.
Abstract The purpose of this study was to analyse the basalt and gneiss dusts formed during stone-crushing operations in companies located in a Brazilian state. An individual sampling pump fitted with PVC filters was attached to the workers' lapel to collect the breathable particles, which were later analysed by X-ray diffraction; a chemical and morphological analysis was also performed. Breathable dust concentrations were high compared to the acceptable limits set by the environmental legislation. The rate of SiO2 for basalt ranged from 1.0 to 5.4% and was over 10% for gneiss. The rate of gneiss was 15% higher than the rate of basalt for particles ranging from 0.5 to 3.0µm, where particles are more irregular in shape and more fibrous. The study showed that gneiss-exposed workers are more prone to silicosis nodule formations (classical silicosis), while basalt is more conducive to mixed dust pneumoconiosis.
Descriptors (primary) Brazil; silica; quarrying industry; silicosis; risk factors; respirable dust
Descriptors (secondary) threshold limit values; personal sampling; fibre counts; mixed dust pneumoconiosis; sampling and analysis; exposure evaluation; breathing atmosphere; x-ray diffractometry; particle size
Document type D - Periodical articles
Country / State or ProvinceBrazil
Subject(s) Mines and quarries
Broad subject area(s) Chemical safety
Browse category(ies) Pneumoconioses
Mining and quarrying