Atmospheric dust methods

Diverse techniques have been employed to identify the sources of elements in atmospheric dust (and surface dust) (Table V). Some involve considering trends in concentration and others use various statistical methods. The degree of sophistication and detail obtained from the analyses increases from top left to bottom right of the Table. The sources identified as contributing the elements in rural and urban atmospheric dusts are detailed in Table VI. The principal sources are crustal material, soil, coal and oil combustion emissions, incinerated refuse emissions, motor vehicle emissions, marine spray, cement and concrete weathering, mining and metal working emissions. Many elements occur in more than one source, and they are classified in the... 

Construction of the facility should be based upon the completed design and incorporate normal construction methods, tools, and techniques. Special preparation of components is necessary, including a general cleaning and protection of components and equipment from potential sources of contamination during the construction phase. The working materials should be protected from atmospheric dust, sawdust, grease, aerosols of oil, and other residues, which may be... 

As stated previously, selenium is introduced into the atmosphere by volcanic activity and by the burning of fossil fuels, especially of coal. Lakin and Byers (35) found 0.05-10 ppm selenium in atmospheric dust collected on air-conditioning filters in 10 U. S. cities. More quantitative measures have been made recently using neutron activation methods to determine selenium in snow and glacial ice (Table XI). These data show that snow in the Boston area contains 10-20 times more selenium than does ice in Greenland glaciers. This variation in selenium content of snow with distance from industrial activity is in harmony with particulate selenium issuing from smokestacks. 

Individual patients will be discussed to illustrate the specificity of their sensitivities, for which they provide valuable models for other such studies (Davies et al. 1974). The test method consisted of simulated occupational exposure to atmospheric dusts of the particular agents. 

BS 6540 (Pt 1) 1985 Methods of test for atmospheric dust spot and efficiency, and synthetic dust weight arrestance HSE Guidance Notes, HMSO, London MS 13 Asbestos (1988)... 

---