Sunday, October 22, 2017

Four characteristics of hazardous substances.

Ignitability
There are three types of ignitable forms:
  • Liquids with a flash point–the lowest temperature at which fumes above waste ignite–of 60 degrees Celsius or 140 degrees Fahrenheit. Examples include alcohol, gasoline, and acetone.
  • Solids that spontaneously combust.
  • Oxidizers and compressed gasses.
Corrosivity
Corrosive substances, such as hydrochloric acid, nitric acid, and sulfuric acid, have the ability eat through containers, causing the leakage of harmful materials. A corrosive is anything liquid with a pH of less than or equal to 2 or greater than or equal to 12.5, or has the ability to corrode steel. Everyday example of corrosives include battery acid and rust removers.
Reactivity
Given their instability, reactive wastes can be very dangerous. The EPA recognizes that there are too many conditions and situations to identify all types of reactive materials. However, they use the following as guidelines to assist generators:
  • unstable, and routinely experiences violent change without detonating
  • potential for explosive mixture or violent reaction when combined with water
  • toxic gasses are released when mixed with water
Toxicity
Poisonous materials pose a threat to our groundwater, which can have long term effects to human health and the environment. This is different from the first three characteristic groups, which the EPA views as containing immediate and firsthand dangers. There are 60 contaminants on the toxicity characteristics list. These contaminants are identified solely through a test method called Toxicity Characteristic Leaching Procedure or TCLP.