ABT Occupational Toxicology

Question 1

Which organization establishes Threshold Limit Values (TLVs) for occupational chemical exposures?

Accepted Answer

ACGIH

Answer

The ACGIH (American Conference of Governmental Industrial Hygienists) establishes TLVs as voluntary guidelines for occupational chemical exposures.

Question 2

OSHA Permissible Exposure Limits (PELs) are typically expressed as what type of measurement?

Accepted Answer

8-hour time-weighted average (TWA)

Answer

OSHA PELs are expressed as 8-hour time-weighted averages reflecting exposures over a standard workday.

Question 3

For volatile organic compounds (VOCs) in the workplace, which route of exposure is generally most significant?

Accepted Answer

Inhalation

Answer

Inhalation is the primary route of exposure for VOCs because their high vapor pressure results in significant airborne concentrations in occupational settings.

Question 4

Under OSHA's lead standard for general industry, at what blood lead concentration must a worker be medically removed from exposure?

Accepted Answer

60 µg/dL

Answer

OSHA's lead standard (29 CFR 1910.1025) requires mandatory medical removal when a worker's blood lead level reaches 60 µg/dL.

Question 5

The 'skin' notation on an ACGIH TLV primarily indicates that:

Accepted Answer

Significant dermal absorption can contribute to the total body burden

Answer

The 'skin' notation indicates that dermal absorption is significant enough to contribute appreciably to overall exposure and potential systemic toxicity.

ABT - American Board of Toxicology Practice Test

ABT - American Board of Toxicology Practice Test

ABT Occupational Toxicology