Respirable silica dust suppression during artificial stone countertop cutting
| Autor: | David L. Johnson, Margaret L. Phillips, Jared H. Cooper |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Engineering
animal structures health care facilities manpower and services Short Communication education Mechanical engineering Air Pollutants Occupational SILICA EXPOSURE countertop cutting stomatognathic system Occupational Exposure Humans Artificial stone Inhalation Exposure Relative efficacy business.industry Construction Materials Metallurgy Public Health Environmental and Occupational Health food and beverages Water Dust General Medicine Equipment Design Quartz Silicon Dioxide 6. Clean water Ventilation Engineering controls Silica dust respirable silica business human activities engineering controls Circular saw |
| Zdroj: | Annals of Occupational Hygiene |
| ISSN: | 1475-3162 |
| Popis: | Purpose: To assess the relative efficacy of three types of controls in reducing respirable silica exposure during artificial stone countertop cutting with a handheld circular saw. Approach: A handheld worm drive circular saw equipped with a diamond segmented blade was fitted with water supply to wet the blade as is typical. The normal wetted-blade condition was compared to (i) wetted-blade plus ‘water curtain’ spray and (ii) wetted-blade plus local exhaust ventilation (LEV). Four replicate 30-min trials of 6-mm deep, 3-mm wide cuts in artificial quartz countertop stone were conducted at each condition in a 24-m3 unventilated tent. One dry cutting trial was also conducted for comparison. Respirable cyclone breathing zone samples were collected on the saw operator and analyzed gravimetrically for respirable mass and by X-ray diffraction for respirable quartz mass. Results: Mean quartz content of the respirable dust was 58.5%. The ranges of 30-min mass and quartz task concentrations in mg m−3 were as follows—wet blade alone: 3.54–7.51 and 1.87–4.85; wet blade + curtain: 1.81–5.97 and 0.92–3.41; and wet blade + LEV: 0.20–0.69 and |
| Databáze: | OpenAIRE |
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