Exposure assessment of laboratory students

Area of Science:

• Occupational Health
• Industrial Hygiene
• Environmental Science

Background:

• Academic institutions like MIT have distinct teaching and research laboratories.
• Understanding chemical exposure levels is crucial for student and staff safety.
• Previous studies may not have comprehensively compared exposure levels between teaching and research settings.

Purpose of the Study:

• To quantify and compare chemical exposures in undergraduate teaching versus graduate research laboratories at MIT.
• To evaluate if chemical exposures are within established health standards.
• To investigate potential differences in exposure based on academic discipline.

Main Methods:

• Collected 132 air samples from Material Sciences, Chemical Engineering, and Biology departments between September and December 1996.
• Measured concentrations of 23 different chemical agents, including cobalt, styrene, and formaldehyde.
• Utilized American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV) standards (STEL and TWA) for comparison.

Main Results:

• All measured chemical exposures were significantly below ACGIH health standards (geometric mean ratio of 0.34%).
• Teaching laboratories exhibited statistically higher chemical exposures (geometric mean 0.38%) compared to research laboratories (geometric mean 0.08%).
• No significant differences in personal protective equipment (PPE) usage were observed across departments.

Conclusions:

• Chemical exposures in the studied academic laboratories are well within safe health limits.
• Undergraduate teaching labs present higher chemical exposure risks than graduate research labs.
• Effective hazard communication, safety training, and rule enforcement are vital for maintaining low exposure levels.