back...
PCBs - The World's Greatest Hidden Threat
PCB's are a major threat to world health yet their hardly dicsussed
in terms of major world problems. Lets look at the facts
PCB - or PolyChlorinated Biphenyls was a great step forward for
industrial chemistry. They were widely marketed in the 1930s onward
and have been used as coolants and lubricants in transformers,
capacitors, and other electrical equipment because they don't
burn easily and are good insulators.
Products made before 1977 (in the United States and Europe) that
may contain PCBs include old fluorescent lighting fixtures and
electrical devices containing PCB capacitors, and old microscope
and hydraulic oils. The manufacture of PCBs was stopped in the
US in 1977 because of massive evidence that PCBs build up in the
environment and can cause harmful health effects.
The truth is that PCBs are extremely stable in the environment
and do not biodegrade. They are a pollutant without equal.
PCBs were used because of their special qualities, such as:
- low vapor pressure
- EXTREME stability, non-biodegradability
- high boiling point: 278 to 415 C
- low solubility in water: 20 C, 15 ppb
- good solubility in many organic solvents and in lubricants
- good thermal conduction
- high dielectric constant
- high-temperature resistance
However, as an environmental pollutant it is unequalled, and
it accumulates in animal tissue with resultant pathogenic and
teratogenic effects. It is unquestionably carcinogenic, and under
certain conditions converts to dioxin, a highly toxic poison.
PCBs were used (and are still used) as coolants and lubricants
in transformers, capacitors, and other electrical equipment because
they don't burn easily and are good insulators. But the transformers
(you can see transformers on electrical transmissions poles, or
at any generating or electrical transmission location), will "leak"
after a time, and the PCBs make their way into the environment.
But not only.
PCBs will enter the air, water, and soil during their manufacture,
use, and disposal. They can enter the environment from accidental
spills during the transformers servicing or their transport.
PCBs can still be (and are) released to the environment from
normal or hazardous waste sites; from the illegal or improper
disposal of industrial wastes and consumer products. PCBs commonly
enter the environment by the improper burning of old electrical
transformers containing PCBs in municipal incinerators
Perhaps the worst form of entering the environment is from illegal
dumping. In countries like Greece, the Army, Navy and even the
Public Power Corporation would dismantle the old transformers
and dump the PCBs into the sea, or shallow pits in desolate areas.
How many other countries have been also guilty of this activity?
There Goes the Sushi!
PCBs once into the environment will bind strongly to soil. PCBs
exposed to the air can also travel long distances and be deposited
in areas far away from the pollution site (polluters seem to know
this phenomenon).
If dumped in the water, only small amounts of PCBs may become
dissolved. The rest usually bind to organic particles and bottom
sediments. As a natural process then, the PCBs are ingested by
small organisms and fish in water. They are naturally then ingested
by other animals that eat these smaller animals as food.
Its is an established fact that PCBs accumulate in fish and marine
mammals tissue, and reach levels that may be many thousands of
times higher than in water. A test on any fish caught in the wild
(or farmed for that matter) will show levels of PCBs now, and
is proof of contamination of the sea. What Does PCB do to you?
Due perhaps to its wide negative political effect, PCB damage
is not as studied or reported as it should be. Dioxin (which PCB
can revert to) is a highly toxic and poisonous chemical damaging
the liver and easily causing death.
There are many studies which show that PBCs cause cancer, birth
defects, and other debilitating illnesses. Damage to the liver
is a given effect.
It is in your food chain and cooking will not purge it from the
food. It is in vegetables and fish, meat and chicken.
And some countries still use it, and some industrialized countries
wish to send their old PCB to underdeveloped countries for easy
disposal
Basic Human Rights | Violations
| Action
Articles
|