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PFCs might last in the environment forever...

















PFCs have become global pollutants in a short period of time.

They are found in remote islands, forests, and polar regions.



They are more persistent in the environment than
PCBs and DDT.

They bioaccumulate.

They are toxic.



They are now found in every person tested.

U.S. residents have the world's highest PFC burdens.





Perfluorinated chemicals are popular for their non-stick and stain-repellant qualities.


The most recognizable are


Polytetrafluoroethylene PTFE, Teflon™
Perfluorooctanoic acid PFOA, C8
Perfluorooctane sulfonic acid PFOS



Nearly 100 PFCs are known.

These include manufacturing precursors, process intermediates, and breakdown products.



Examples are fluorotelomer alcohols (FTOHs) and perfluorinated carboxylic acids (PFCAs
or PFAs).

PFOS and PFOA receive the most attention.




PFCs have not been adequately studied in regards to toxicity.

Still, the following picture is
emerging.




PFCs are especially toxic to developing fetuses and newborns.

The developmental neurotoxic effects of PFCs are similar to those reported for
PCBs and PBDEs.



PFOA crosses the placenta unhindered into the fetus, and PFOS is only slightly hindered.

Other PFCs cross the placenta as well.

Some research suggests there is an interactive effect between maternal stress and prenatal exposure to PFCs.



The rate of neonatal survival corresponds to maternal PFC burden.




PFCs are now found in the cord blood of every newborn tested.



There is an association between cord serum concentration and low birth weight and size.



In some cases a deficit in postnatal weight gain becomes a wasting syndrome.




PFCs are teratogenic -- prenatal exposure can result in miscarriage and birth defects.



Sometimes offspring are born with enlarged livers, under-developed lungs, or problems with vision.



Cancers may develop relatively early in life, especially liver and testicular.




A contaminated mother exposes her child first during gestation and then again while nursing.


PFCs can alter a mother's milk protein gene expression and stunt her daughter's mammary gland development.




Once inside the body, the half-life for excretion is roughly 4 years.



That means after 4 years only half is eliminated.

After 16 years more than 5% of the original exposure is still in the body.



But exposure happens daily.

That means people will carry PFC burdens for life.



Also, newborns have considerably less ability to eliminate PFCs.

So the most vulnerable population also retains the most.



To the extent that PFCs do deteriorate inside the body, the break down products appear to be more toxic.




PFCs are potent disruptors of gene expression.

A dose of 10 mg/kg per day -- just 10 ppm -- alters the expression of over 800 genes.



Many of these genes involve


Cell communication

Cell adhesion

Cell growth

Cell apoptosis (death)

Immune function

Hormone regulation

Metabolism

Neurotransmitters

Transport and metabolism of lipids, particularly fatty acids



Adverse effects reported with PFCs can be traced back to these disruptions.



For instance, suppressed expression of cell adhesion proteins can result in changes to the cell membrane.

Membrane permeability is one of the effects seen when cells are exposed to PFCs.




PFCs cause immune system damage.



Pre-natal exposure to PFCs can cause deficits in
innate and humoral immunity.



PFC exposure can increase allergic sensitivity to egg white.

It may increase the IgE response to environmental allergens in general.



PFCs disrupt digestive activity which also has a downstream effect on immune function.




Some of the most striking effects involve hormone regulation.



PFCs are endocrine disruptors.

Evidence suggest they may interface directly with estrogen receptors.



Observed effects include

  • Incorrect differentiation between male and female during gestation

  • Alterations in the physical structure of testes

  • Increased estrogen and decreased testosterone -- but early puberty in males and not females

  • Changes in thyroid function

  • Altered cholesterol levels

  • Neuroendocrine disruption




In general, many toxics are lipophilic (fat loving) and are bound up in adipose (fat) tissue.



One curious effect of PFC exposure is the atrophy of adipose tissue.



Toxicants are released when fat cells degenerate.

This elevates the concentration of of toxicants circulating throughout the body.



Consequently, PFC exposure can trigger illnesses caused by toxicants other than itself.






PFCs are
excitotoxic.








PFCs are neurotoxic to Purkinje (brain) cells.






Methylated forms of PFCs interfere with mitochondrial metabolism.


Observations include


The uncoupling of oxidative phosphorylation

Changes in Ca2+ levels

Generation of reactive oxygen species

Oxidative damage

Induced apoptosis




Other effects have yet to be confirmed, but finding them will not be a huge surprise.


For instance, diabetes and certain forms of cancer are associated with derangement of the G-protein signaling pathways suppressed by PFCs.


Note that liver cancer, testicular cancer, and glioblastoma multiforme (GBM) tumors have already been associated with PFCs.




PFCs are familiar by trade names such as



Teflon™

Stainmaster™

ScotchGaurd™

Stain Defender™

Gore-Tex™



PFCs are used in a very broad range of products.


Many of the items off-gas the chemicals constantly.


Indoor air is filled with PFCs.




Airplanes coatings
exteriors
parts
Appliances curling irons
electric frying pans
hair dryers
hair straighteners
ironing board covers
irons
range hoods
toaster ovens
Automotive bearings
bushings
waxes
engine parts
gears
lubricants
oil filters
paint protection
wiper blades
Building materials anti-corrosion agents
carpets
paint
rugs
solar panel coatings
Cleaning products floor waxes
stain removers
stain repellents
surfactants
toilet bowl cleaners
Clothing "stain resistant", "waterproof", "water repellant"
boots
hosiery
jackets
leatherwear
pants
rainwear
shirts
shoes
sweaters
etc.
Electrical and electronic components computer chips
electrical tape
light bulbs
wire insulation
Food packaging candy wrappers
fast food containers
foil cooking liners
microwave popcorn bags
paper plates
pizza boxes
Fire protection extinguishers
foams
retardants
Furniture baby layettes
beds
chairs
patio furniture
sofas
soft furnishings
upholstery
Kitchen utensils and gadgets especially nonstick cookware
Personal care anti-wrinkle creams and injections
conditioners
dental floss
denture cleaners
lotions
mascara
medicine containers
nail color
nail hardener
nail polish
nail polish removers
prosthetic devices
razor blades
shampoos
shaving creams
shaving foams
shaving gels
Pesticides
Pets bedding
collars
harnesses
leashes
Various camping equipment
eyeglasses with scratch-resistant lenses
gardening equipment
luggage
papers
stadium roof coverings
surgical instruments
umbrellas






Pasta factories use non-stick dies to speed production and simplify cleaning.



The smoother the pasta, the more likely it was made on a PFC surface.





PFOS has been
observed to enhance the toxicity of clophosphamide (CPP), a cancer drug similar to mustard gas.


Further research is required to discover additional
synergistic toxicity between PFCs and other chemicals.




Wastewater plants are not designed to treat PFCs.

Neither are municipal drinking water treatment facilities.

The PFCs just stream right through.



Experiments show that reverse osmosis (RO) filtration is >99% effective at rejecting PFOS.



But RO is not considered a practical large scale solution for municipal water treatment plants.

Currently there are no successful solutions for water treatment facilities to remove PFCs.




PFOA and PFOS are not broken down by heat, light, or microbes.



Other PFCs can break down but most of them end up giving off PFOA or PFOS in the process.



For example, PTFE (Teflon) is a complex mixture of PFCs.

It
releases toxic gases including PFOA when heated.



PFCs have been detected when cookware reaches 446°F (a medium heat).

Heated non-stick coatings have been reported to kill pet birds at 396°F.

That means toxic fumes begin releasing at even lower temperatures.



Humans can
experience a severe flu-like illness named polymer fume fever.



Frequent use of non-stick cookware at high temperatures will cause the coating to breakdown quickly.

Dishwashing detergents can also accelerate the process.



All perfluorinated cookware is similarly hazardous regardless of the brand name or marketing claims.

The difference between brands stems from the proportion of PTFE blended with other materials.




3M began to phase out PFOS from its ScotchGaurd fabric protector and other products in 2000-2002.



In January 2006 DuPont and other companies
volunteered to phase out the use of PFOA.

However, the target for withdrawal is 2015 and it is not binding.



The EPA has not added PFOA to its Toxics Release Inventory

It has no timetable for doing so.



To learn more about PFCs, consider these starting points