States join together to get rid of the worst-of-the-worst chemicals
Persistent, bioaccumulative toxics, commonly known as PBTs, are a group of toxic chemicals that are joined together by some common features. Common PBTs in our lives include mercury, DDT, cadmium, lead, and several groups of chemicals including PCBs, toxic flame retardants (PBDEs) and dioxins. While these chemicals have many different uses in our lives, and different effects on our health, they are joined together by the following facts:
- PBTs are persistent. These chemicals are often used in manufacturing because of the exact features that cause great, great trouble in our environment: they don't break down, and they stay in the environment for a very long time. PCBs, for instance, are man-made mixtures of chlorinated compounds that are used in manufacturing because they are non-flammable, have a high boiling point, and are insoluble in water: all features that make them very difficult to dispose of.
- PBTs are bioaccumulative. Once these chemicals are ingested by living creatures, they build up in fatty tissue, and move up the food chain as they are consumed by bigger creatures, eventually making their way into our diets.
- PBTs are toxic. These chemicals have been associated with all manner of health effects: mercury affects the nervous system of developing fetuses, chronic exposure to DDT affects the liver and kidneys among other parts of the body, cadmium has been labeled by the Environmental Protection Agency (EPA) as a probable carcinogen, lead exposure in adults results in neurological effects like seizures, PCBs pose a cancer risk, PBDEs have been found to be endocrine disruptors, and dioxins cause reproductive and developmental problems.
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