Testing Status of Agents at NTP
Asphalt Table A-3
Table A-1 Exposure concentrations measured during asphalt refinery operations
Exposure Concentration (mg/m3) | ||||||||
---|---|---|---|---|---|---|---|---|
Samples | Mean | |||||||
Occupation | Source of exposure | Number | Type | Range | Arithmetic | Geometric | Reference | |
General asphalt refinery workers | Vacuum distillation | 4 | Total PAHs | 0.00473-0.01571 | 0.00951 | 0.00821193 | NIOSH [1980] | |
General asphalt refinery workers | Asphalt processing
(6 refineries) | 14 | Total PAHs
7- to 8-hr TWA |
0.0015-0.03073 | 0.01042 | 0.0066866 | NIOSH [1983c] | |
General asphalt refinery workers | Deasphalting (1 refinery) | 4 | Total PAHs
7- to 8-hr TWA |
0.0014-0.0412 | 0.02087 | 0.1197 | ||
Operator | Deasphalting | 2 | Total PAHs 7- to 8-hr TWA | 0.00344-0.02074 | 0.01209 | 0.0084466 | ||
Assistant operator | Deasphalting | 3 | Total PAHs 7- to 8-hr TWA | 0.00250-0.04975 | 0.02451 | 0.138 | ||
Bitumen loaders | Bitumen refinery unit (outdoors; bitumen tempera-ture, 170-210C) | Benzene solubles | 0.3-1.0 | ---- | ---- | Claydon et al. [1984] | ||
Total particulates | 0.1-1.4 | ---- | ---- | |||||
Package fillers | Indoor area (bitumen temperature, 220C) | 2 | Total particulates 8-hr TWA | 0.20-0.32 | 0.23 | 0.253 | Brandt & Molyneux [1985] | |
Bitumen loaders | Bitumen refinery installation (outdoors; bitumen temp 170210C) | 4 | Total particulates 8-hr TWA | 0.7-2.9 | 1.4 | ---- | ||
4 | Benzene solubles 6-hr TWA | <0.1-1.0 | 0.4 | ---- | ||||
4 | Total PAHs | 3.8-??? | 33 | ---- | ||||
Operator | Asphalt refinery terminal (temp of roduce at fume source ranged from 160-375C | 11 | Total particulates 6-hr TWA | <0.03-8.2 | 0.88 | 0.17 | AI [1991] | |
11 | Benzene solubles 6-hr TWA | 0.034-1.9 | 0.42 | 0.14 | ||||
Assistant operator | 9 | Total particulates 6-hr TWA | <0.03-0.49 | 0.25 | 0.18 | |||
9 | Benzene solubles 6-hr TWA | <0.066-0.32 | 0.13 | 0.11 | ||||
Lab technician | 4 | Total particulates 6-hr TWA | 0.17-0.26 | 0.23 | 0.22 | |||
4 | Benzene solubles 6-hr TWA | <0.062-0.43 | 0.21 | 0.15 | ||||
Loader/ pumper operator | 10 | Total particulates 6-hr TWA | <0.026-14 | 1.6 | 0.29 | |||
10 | Benzene solubles 6-hr TWA | 0.038-13 | 1.6 | 0.29 | ||||
Maintenance administration | 6 | Total particulates 6-hr TWA | <0.032-0.77 | 0.29 | 0.17 | |||
6 | Benzene solubles | 0.011-0.22 | 0.1 | 0.076 | ||||
Utility worker | 4 | Total particulates 6-hr TWA | <0.024-0.062 | 0.043 | 0.039 | |||
4 | Benzene solubles | <0.054-1.1 | 0.49 | 0.3 |
* Concentrations are reported as milligrams of asphalt fumes per cubic meter of air (mg/m3) in personal samples, except for those figures marked with an () which were area samples.
Area sample
Web page last updated on August 15, 2005