There are breath and blood tests available for determining the presence of
benzene in a person; unfortunately, they are only accurate for recent exposure.
There is also a urine test but it works on a slightly different premise.
Benzene converts to metabolites in the body and some of them can be measured by
urinalysis. This too is only accurate for recent exposure.
What about Workplace Precautions?
Wear solvent-resistant gloves and clothing as benzene can be absorbed
through the skin. Neoprene, Silver Shield, Polyvinyl Alcohol and Butyl Neoprene
are often recommended as protective materials, but contact manufacturers and
safety equipment suppliers for recommendations on the glove/clothing material
that offers the most protection in your daily exposure. Keep all protective
clothing clean and put them on every day before arriving at work. Wash
thoroughly at the end of the work shift and immediately after any exposure to
benzene.
Do not wear contact lenses when working with benzene; do wear impact and splash
resistant goggles when working with liquids. If you work with corrosive, highly
irritating, or toxic substances, wear a face shield along with the goggles.
Where the potential exists for exposure over the 1ppm standard, a
supplied-air respirator with a full face piece operated in a positive-pressure
mode. Improper use of respirators is dangerous and should only be used
according to a written program as described in OSHA 1910.34.
Workplaces should have a regulated, marked area where all benzene is handled,
used, or stored. Hazard and warning information should be posted in plain view,
and potentially exposed workers should receive training and education on the
health and safety hazards of working with benzene.