LEAD, CHROMIUM, AND CADMIUM EXPOSURE DURING ABRASIVE BLASTING

An evaluation of lead, cadmium, and chromium exposure was conducted du ring abrasive blasting of a steel bridge to remove paint in preparatio n for repainting. Airborne lead concentrations were measured at severa l locations inside the containment structure, as well as near the work ers' breathing zones. Airborne cadmium and chromium were also measured in the containment area. Blood lead levels were monitored in each wor ker. Airborne lead and cadmium levels in containment exceeded the Occu pational Safety and Health Administration's permissible exposure limit s by factors of 219 and 3.1, respectively. The use of supplied air-bla sting helmets will not effectively reduce workers' lead exposure to th e permissible exposure limits when airborne levels are as high as were measured in this study. Studies are needed to evaluate additional eng ineering controls and alternative paint removal methods. Evaluation of workers' exposure to lead and other hazardous metals is needed for pr ojects involving abrasive blasting. Medical surveillance for cadmium a nd lead may be necessary for similar projects.