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PRINCIPLES OF TOXICOLOGY

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34 GENERAL <strong>PRINCIPLES</strong> <strong>OF</strong> <strong>TOXICOLOGY</strong><br />

Answers to Table 1.1 Comparative Acutely Lethal Doses<br />

Actual<br />

Ranking No.<br />

LD50<br />

(mg/kg) Toxic Chemical<br />

1 15,000 PCBs<br />

2 10,000 Alcohol (ethanol)<br />

3 4,000 Table salt—sodium chloride<br />

4 1,500 Ferrous sulfate—an iron supplement<br />

5 1,375 Malathion—pesticide<br />

6 900 Morphine<br />

7 150 Phenobarbital—a sedative<br />

8 142 Tylenol (acetaminophen)<br />

9 2 Strychnine—a rat poison<br />

10 1 Nicotine<br />

11 0.5 Curare—an arrow poison<br />

12 0.001 2,3,7,8-TCDD (dioxin)<br />

13 0.00001 Botulinum toxin (food poison)<br />

Adapted from Loomis’s Essentials of Toxicology, Fourth Edition, T.A. Loomis and A.W. Hayes,<br />

Academic Press, San Diego, CA, 1996.<br />

Answers to Table 1.2 Occupational Exposure Limits: Aspirin and Vegetable Oil Versus Industrial Solvents<br />

N Allowable Workplace Exposure Level (mg/m 3 ) Chemical (use)<br />

1 0.1 Iodine<br />

2 5 Aspirin<br />

3 10 Vegetable oil mists (cooking oil)<br />

4 55 1,1,2-Trichloroethane (solvent/degreaser)<br />

5 188 Perchloroethylene (dry-cleaning fluid)<br />

6 170 Toluene (organic solvent)<br />

7 269 Trichloroethylene (solvent/degreaser)<br />

8 590 Tetrahydrofuran (organic solvent)<br />

9 890 Gasoline (fuel)<br />

10 1590 Naphtha (rubber solvent)<br />

11 1910 1,1,1-Trichloroethane (solvent/degreaser)<br />

Source: American Conference of Government Industrial Hygienists (ACGIH), 1996.

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