Unit 6 Flashcards
What list takes into account Toxic Metals?
CERCLA Priority List of Hazardous Substances
What is that toxic substances list created by?
ATSDR, rank-ordered list of hazardous substances, revised and published on a 2-year basis with a yearly informal review and revision
Why are these substances listed? What characteristics must they have? (Two)
- Have known or suspected toxicity
and
2.. Have potential for human exposure at National Priorities List sites
National Priorities List (NPL)
Most serious uncontrolled or abandoned hazardous waste sites identified for possible long-term remedial action under Superfund, updated at least once a year
Characteristics of heavy metals (weight, specific gravity that exceeds specific gravity of what at 4 Celsius) (two things)
- High atomic weight
- Water
Essential metals with potential for toxicity
Iron, copper, manganese, zinc
3 modes of exposure toxic metals
- Lungs (inhalation)
- Skin (contact with dusts)
- Mouth (ingestion)
Acute toxic metal poisoning
Rapid onset
Symptoms: either gastrointestinal or neurological
Long-term metal exposure consequences
Reduced cognitive function
Mimicking of chronic disease symptoms making it difficult to differentiate and diagnosis
Potential exposure media
Air, soil/dust, water, biota/food
Which heavy metals have the capacity to cross the placental barrier?
Lead and mercury