Unit 6

Question 1

What list takes into account Toxic Metals?

Answer 1

CERCLA Priority List of Hazardous Substances

Question 2

What is that toxic substances list created by?

Answer 2

ATSDR, rank-ordered list of hazardous substances, revised and published on a 2-year basis with a yearly informal review and revision

Question 3

Why are these substances listed? What characteristics must they have? (Two)

Answer 3

1. Have known or suspected toxicity

and

2.. Have potential for human exposure at National Priorities List sites

Question 4

National Priorities List (NPL)

Answer 4

Most serious uncontrolled or abandoned hazardous waste sites identified for possible long-term remedial action under Superfund, updated at least once a year

Question 5

Characteristics of heavy metals (weight, specific gravity that exceeds specific gravity of what at 4 Celsius) (two things)

Answer 5

1. High atomic weight
2. Water

Question 6

Essential metals with potential for toxicity

Answer 6

Iron, copper, manganese, zinc

Question 7

3 modes of exposure toxic metals

Answer 7

1. Lungs (inhalation)
2. Skin (contact with dusts)
3. Mouth (ingestion)

Question 8

Acute toxic metal poisoning

Answer 8

Rapid onset

Symptoms: either gastrointestinal or neurological

Question 9

Long-term metal exposure consequences

Answer 9

Reduced cognitive function

Mimicking of chronic disease symptoms making it difficult to differentiate and diagnosis

Question 10

Potential exposure media

Answer 10

Air, soil/dust, water, biota/food

Question 11

Which heavy metals have the capacity to cross the placental barrier?

Answer 11

Lead and mercury