Asphalt Table A-3

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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