NEHA Hazardous Materials and Toxicology 2 — Questions and Answers
Question 1: What health effects are associated with chronic exposure to lead, particularly in children?
- Skin rashes and dermatitis only
- Neurodevelopmental impairment, reduced IQ, behavioral problems, and learning disabilities (Correct answer)
- Respiratory disease and asthma
- Liver damage and cirrhosis
Correct answer: Neurodevelopmental impairment, reduced IQ, behavioral problems, and learning disabilities
Chronic lead exposure in children causes irreversible neurodevelopmental damage including reduced IQ, impaired cognitive function, behavioral problems, and learning disabilities, with no safe level of exposure identified.
Question 2: What is the primary health concern from exposure to asbestos?
- Acute skin irritation and burns
- Mesothelioma, lung cancer, and asbestosis from inhalation of fibers (Correct answer)
- Liver toxicity and jaundice
- Reproductive disorders from dermal contact
Correct answer: Mesothelioma, lung cancer, and asbestosis from inhalation of fibers
Inhalation of asbestos fibers causes mesothelioma (cancer of the pleural lining), lung cancer, and asbestosis (progressive lung scarring), often with a latency period of decades between exposure and disease.
Question 3: What is meant by the term 'permissible exposure limit (PEL)' in occupational health?
- The maximum lifetime cumulative dose of a chemical
- The maximum airborne concentration of a hazardous substance to which workers may be exposed over an 8-hour workday (Correct answer)
- The minimum concentration at which a substance can be detected by smell
- The concentration at which immediate death occurs
Correct answer: The maximum airborne concentration of a hazardous substance to which workers may be exposed over an 8-hour workday
OSHA's PELs are legally enforceable limits on the airborne concentration of hazardous substances in the workplace, typically expressed as time-weighted averages over an 8-hour workday or 40-hour workweek.
Question 4: What is 'biomagnification' as distinguished from bioaccumulation?
- The increase in toxin concentration in tissues over an organism's lifetime
- The progressive increase in toxin concentration at successively higher levels of a food chain (Correct answer)
- The laboratory process of concentrating environmental samples for analysis
- The increase in toxin production by bacteria in sediments
Correct answer: The progressive increase in toxin concentration at successively higher levels of a food chain
Biomagnification describes the progressive increase in concentration of a persistent substance at each successive trophic level of a food chain, so top predators accumulate the highest concentrations.
Question 5: What hazard communication information must be present on Safety Data Sheets (SDS) under OSHA's Hazard Communication Standard?
- Only the trade name and manufacturer contact information
- 16 standardized sections including chemical identity, health hazards, physical hazards, exposure limits, and emergency response information (Correct answer)
- Only first aid instructions for accidental exposure
- Pricing and purchasing information for the chemical
Correct answer: 16 standardized sections including chemical identity, health hazards, physical hazards, exposure limits, and emergency response information
OSHA's updated Hazard Communication Standard (GHS-aligned) requires 16 standardized SDS sections covering chemical identification, hazard identification, composition, first aid, fire fighting, handling, exposure controls, health effects, and regulatory information.
Question 6: What is the primary health effect of carbon monoxide (CO) poisoning?
- Liver damage from metabolic disruption
- Oxygen deprivation (tissue hypoxia) caused by CO binding to hemoglobin with greater affinity than oxygen (Correct answer)
- Respiratory irritation and chemical pneumonia
- Kidney failure from direct nephrotoxicity
Correct answer: Oxygen deprivation (tissue hypoxia) caused by CO binding to hemoglobin with greater affinity than oxygen
Carbon monoxide binds to hemoglobin approximately 250 times more strongly than oxygen, forming carboxyhemoglobin that cannot carry oxygen, causing tissue hypoxia, which can result in neurological damage or death.
NEHA Hazardous Materials and Toxicology 2
What health effects are associated with chronic exposure to lead, particularly in children?