Mortality Among Hardmetal Production Workers: Occupational Exposures

Area of Science:

• Occupational Health
• Industrial Hygiene
• Environmental Epidemiology

Background:

• The hardmetal industry involves exposure to metals like cobalt, tungsten, and nickel, posing potential health risks.
• Accurate exposure assessment is crucial for epidemiological studies, particularly mortality studies.
• Retrospective studies require reliable quantitative exposure data for historical worker cohorts.

Purpose of the Study:

• To develop quantitative exposure estimates for retrospective occupational cohort mortality studies in the hardmetal industry.
• To create job-exposure matrices (JEMs) for key metals: cobalt, tungsten, and nickel.
• To cover the time period from 1952 to 2014.

Main Methods:

• Job-exposure matrices (JEMs) were constructed for cobalt, tungsten, and nickel.
• Job classes were defined based on job titles and performed processes.
• Exposure estimates were derived from available company industrial hygiene measurements.
• Exposure intervals were set at one-half order magnitude for all agents.

Main Results:

• Significant decreasing time trends in cobalt exposure were observed in eight job classes.
• No significant time trends were detected for tungsten or nickel exposures.
• Established exposure levels were comparable to or lower than previously reported values for the hardmetal industry during the study period.

Conclusions:

• The developed JEMs provide valuable quantitative exposure data for the hardmetal industry.
• Findings suggest potential improvements in exposure control for cobalt over time.
• The study's exposure estimates are consistent with historical data, supporting their utility for mortality studies.