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- Not all forms of a chemical pose a health hazard. For
example, a lead pipe is not a significant health hazard. However, the lead can become a
human health hazard if the pipe is sanded or welded, producing lead dust or fumes. The
dust or fumes can become airborne and be inhaled, or it can leach into water and be
ingested.
- A chemical may be hazardous even in solid form. For example,
individuals who are sensitized to nickel may develop dermatitis
from skin contact with the metal. Fuming solids emit toxic vapors that may be inhaled.
Some materials, such as pesticides, can evaporate directly from solid form.
- Some solids are not a hazard alone but become hazardous when
they come into contact with other chemicals (e.g., acid in contact with iron can release
hydrogen gas).
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