Testing Status of Agents at NTP
Asphalt Table A-3
Table A-3. Exposure concentrations measured during hot-mix asphalt preparation
Exposure concentration (mg/m3) | |||||||
---|---|---|---|---|---|---|---|
Sample | Mean | ||||||
Occupation | Source of Exposure | Number | Type | Range | Arithmetic | Geometric | Reference |
Not specified | Preparation of HMA | 8 | Total particulates | 0.5-7.2 | ___ | ___ | Puzinauskas & Corbett (1975) |
8 | Benzene solubles | 0.2-5.4 | ___ | ___ | |||
Man in control cabin and operator on HMA storage bins | Asphalt plants (2) | ___ | Total particulates 8-hr TWA | BLD-1.7 | 0.7 | ___ | Byrd & Mikkelsen (1979) |
Loader/Operator | HMA preparation (temperature of product at fume source ranged from 129-170 C) | 9 | Total particulates 6-hr TWA | 0.16-6.0 | 1.8 | 1.2 | AI (1991) |
9 | Benzene solubles 6-hr TWA | 0.033-1.7 | 0.33 | 0.16 | |||
Groundman | 9 | Total particulates 6-hr TWA | 0.17-1.4 | 0.61 | 0.53 | ||
9 | Benzene solubles 6-hr TWA | 0.062-0.43 | 0.23 | 0.19 | |||
Plant operator | 6 | Total particulates 6-hr TWA | 0.1-1.5 | 0.79 | 0.58 | ||
6 | Benzene solubles 6-hr TWA | 0.026-0.28 | 0.16 | 0.13 | |||
Laborer | 5 | Total particulates 6-hr TWA | 0.2-15 | 4.0 | 1.5 | ||
5 | Benzene solubles 6-hr TWA | 0.011-0.22 | 0.1 | 0.069 | |||
Foreman/ Supervisor | 4 | Total particulates 6-hr TWA | 0.27-1.1 | 0.61 | 0.53 | ||
4 | Benzene solubles 6-hr TWA | <0.065-1.4 | 0.5 | 0.28 |
*
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.
Web page last updated on August 15, 2005