| ID (ISN) del documento | 28420 |
| Número CIS |
78-50 |
| ISSN - Título de la serie |
Letopisi na higienno-epidemiologičnata služba |
| Año |
1977 |
| Número de serie |
|
| Autor(es) |
Dobreva M., Dinolova B. |
| Título |
Determination of concentration of asbestos fibres in workplace samples of mixed dust |
| Título original |
Opredeljane koncentracijata na azbestovi vlakna v smesen azbest-sădăržašt prah ot văzduha na rabotnata sreda [en búlgaro] |
| Información bibliográfica |
1976, Vol.9, No.3, p.127-130. 2 ref. |
| Resumen |
A review of the basic properties of 2 mineralogical asbestos groups (serpentine (chrysotile) and the amphiboles) is followed by considerations on TLVs and the determination of concentrations. The article lays down rules for mass concentration determination and describes a fibre count method (number concentration of total dust and of respirable dust fraction); filtration sampling, preparation of samples, preliminary particle number concentration determination by phase-contrast microscopy, calculation of number concentration of asbestos fibres. Fibres exceeding 5µm in length are differentiated according to thicknesses above and below 3µm. 6 TLVs for mixed dust of different asbestos content are recommended. |
| Descriptores (primarios) |
valores umbrales; recuento de las fibras; medida del empolvamiento; polvos mixtos; amianto |
| Descriptores (secundarios) |
límite gravimétrico de empolvamiento; determinación de la concentración ponderal; crisotila; descripción del procedimiento; polvos respirables; límite numérico de empolvamiento; anfibola |
| Tipo de documento |
- |
| Tema(s) |
Polvos, aerosoles
|
| Broad subject area(s) |
|
| Navegación por categoria(s) |
Occupational exposure limits
Asbestos
|
