| Document ID (ISN) | 37940 |
| CIS number |
82-948 |
| ISSN - Serial title |
0002-8894 - American Industrial Hygiene Association Journal |
| Year |
1982 |
| Convention or series no. |
|
| Author(s) |
Janko M., Carlson P., Ellis K. |
| Title |
Analytical methods applied to Portland, Oregon, volcanic ash analysis |
| Bibliographic information |
Feb. 1982, Vol.43, No.2, p.128-132. Illus. 15 ref. |
| Abstract |
In order to evaluate the possible exposure to free silica of crews cleaning up volcanic ash deposited by the 1980 eruptions of Mount St. Helens, the free silica content of the respirable dust portion of the ash was determined. Ash samples were pre-treated with phosphoric acid to remove silicate interferences and were analysed by x-ray diffraction for crystalline silicas. The residue after acid treatment was examined using optical methods, and the total crystalline free silica content was determined by the Talvitie colorimetric method. The colorimetric method was applied to occupational exposure samples of Portland-area maintenance personnel. Respirable dust exposure after 2 of the eruptions was in the range 0.02-0.48 and 0.03-0.36mg/m3, and the total crystalline silica content of the respirable dust fractions was 4.58-6.64%. Clean-up crews wore approved respirators. The combination of low-level exposure and respiratory protection reduced the possibility of silica-induced health problems. |
| Descriptors (primary) |
road work; respirable dust; free silica; volcanism |
| Descriptors (secondary) |
airborne dust; spectrophotometric colorimetry; USA; description of technique; exposure evaluation; x-ray diffractometry; dust analysis; silica |
| Document type |
D - Periodical articles |
| Subject(s) |
Dust, aerosols and related diseases
|
| Broad subject area(s) |
|
| Browse category(ies) |
Natural phenomena
Road transportation
|
