Mercury exposure in chloralkali plants.

Area of Science:

• Occupational Health
• Environmental Toxicology
• Industrial Hygiene

Background:

• Chloralkali plants utilize mercury, posing potential exposure risks to workers.
• Understanding mercury toxicity signs and symptoms is crucial for occupational health surveillance.
• Previous studies have indicated potential health effects from mercury exposure in industrial settings.

Purpose of the Study:

• To correlate signs and symptoms of mercury toxicity with exposure levels in chloralkali plant employees.
• To compare health outcomes among workers with varying degrees of mercury exposure.
• To identify specific health indicators associated with chronic mercury vapor exposure.

Main Methods:

• Study of employees from two chloralkali plants over extended periods (1957-1978 and 1976-1979.5).
• Classification of workers into three groups based on hours worked in mercury-exposed areas.
• Measurement of time-weighted average exposure levels to mercury vapor, generally ranging from 0.05 to 0.10 mg/m³ in high exposure groups.

Main Results:

• No significant differences in the frequency of objective or subjective findings were observed among the three exposure groups.
• A notable exception was lower post-exposure systolic and diastolic blood pressure in the high exposure group at the second plant.
• No correlation was found between mercury vapor exposure levels and subjective or objective weight loss.

Conclusions:

• Occupational mercury exposure in chloralkali plants did not significantly correlate with a wide range of toxicity signs and symptoms.
• Lowered blood pressure in highly exposed workers at one plant warrants further investigation.
• Current exposure levels may not elicit pronounced systemic toxicity, but localized effects like blood pressure changes require attention.