=======================Electronic Edition========================
RACHEL’S HAZARDOUS WASTE NEWS #269
—January 22, 1992—
News and resources for environmental justice.
——
Environmental Research Foundation
P.O. Box 5036, Annapolis, MD 21403
Fax (410) 263-8944; Internet: erf@igc.apc.org
==========
The Back issues and Index
are available
here.
The official RACHEL archive is here.
It’s updated constantly.
To subscribe, send E-mail to rachel-
weekly-
request@world.std.com
with the single word SUBSCRIBE in the message. It’s free.
===Previous Issue==========================================Next Issue===
EPA’S DIOXIN REASSESSMENT–PART 1:
NEW PICTURE OF DIOXIN’S TOXICITY EMERGES
U.S. Environmental Protection Agency [EPA] is pressing ahead with
its “reassessment” of the toxicity of dioxin, aiming to produce a
draft report by June. It has been widely rumored in newspapers
that EPA’s reassessment will downgrade the dangers of dioxin. But
in fact it now appears that EPA may conclude in June that dioxin
is at least as toxic as the agency now assumes it to be–and it’s
even possible the agency will declare dioxin more toxic, not less.
EPA officials announced in April 1991 that “new scientific
evidence” showed dioxin may be less dangerous than the agency had
said back in 1985 when it first set stringent standards for
dioxin exposure to humans. Based on the “new evidence” it was
time to reassess the dangers of dioxin, agency chief William
Reilly announced in April. Then, as the year-long reassessment
got under way, Mr. Reilly jumped the gun and told the NEW YORK
TIMES August 15 (pg. 1) what the conclusions of his agency’s
study would be: “We are now seeing new information on dioxin that
suggests a lower risk assessment for dioxin should be applied.”
The TIMES ran the story on page one.
We have since learned that the whole idea of reassessing the
toxicity of dioxin originated with executives of four major paper
companies who visited Mr. Reilly’s office January 23rd, 1991, and
that Mr. Reilly’s August statement to the NEW YORK TIMES
reflected the paper industry’s agenda, not the views of EPA
scientists. At an EPA public hearing on dioxin in Washington
November 15, Greenpeace and Alder-Hill Associates of Tidewater,
Oregon [(503) 528-7151], released leaked documents including a
January 25th, 1991, letter from the four paper company chief
executive officers (John A. Georges, International Paper; T.
Marshall Hahn, Jr., Georgia-Pacific Corp.; Furman C. Moseley,
Simpson Paper; and Andrew C. Sigler, Champion International)
thanking Mr. Reilly for his receptiveness to their ideas January
23: “We were also encouraged by what we perceived as your
willingness to move expeditiously to re-examine the potency of
dioxin and chloroform in light of the important new information
that has been submitted with respect to those chemicals.”
In their discussions with Mr. Reilly Jan. 23, these executives
browbeat EPA for “failure to act on the emerging health science.”
They claimed there is now a “prevailing view that low-level
dioxin exposures do not pose a serious health threat.” “Despite
this new reality,” they said in their January 25 letter, “EPA has
taken no tangible or timely steps to revisit its health criteria
for dioxin, and has even failed to temper the Agency’s zeal in
acting on the worst risk estimates….” As a direct result of
these EPA failures, the executives told Mr. Reilly, the paper
industry is beleaguered by “public fears about risk associated
with dioxin which bears no relationship to scientific evidence. A
consequence of this atmosphere is that our companies are now the
subject of groundless class action toxic tort suits seeking
billions of dollars in damages.”
In other words, it’s entirely EPA’s fault that the paper industry
has now begun to resemble the asbestos industry–overwhelmed by
lawsuits by citizens claiming harm from exposure. In no uncertain
terms, these paper company executives told Mr. Reilly how
important it was that his agency play down the toxicity of dioxin
in public statements: “Reasoned public statements can help calm
the needless public alarm that has, in turn, stimulated the
proliferation of unjustified legal action against so many
companies in our industry,” the paper company officials said.
In August Mr. Reilly met the paper industry’s need for “reasoned
public statements” and the NEW YORK TIMES put it on page one:
“U.S Officials Say Dangers of Dioxin Were Exaggerated.” At least
26 other major American newspapers picked up this story, and it
is now “common knowledge” that dioxin is not as dangerous as
officials used to think. William Reilly himself says so.
Meanwhile EPA’s scientific staff was pursuing a very different
line of reasoning. They had concluded that dioxin not only causes
cancer in humans, but also that it interferes with human health
in a broad range of ways. EPA scientists are now referring to
dioxin as an “environmental hormone.”
Based on concern about dioxin’s potency as a carcinogen, EPA in
1985 established a very stringent allowable intake of dioxin for
humans: 0.006 picograms (or 0.000000006 micrograms) per kilogram
of body weight per day. Since the “average” person is assumed to
weigh 70 kilograms (154 pounds), this “average” person is allowed
to eat no more than 0.006 x 70 = 0.42 picograms of dioxin each
day. One microgram is one-millionth of one gram; a picogram (pg)
is a millionth of a microgram, or a trillionth of a gram. There
are 28 grams in an ounce.
Unfortunately, because of widespread dioxin contamination of the
food chain by the paper industry and other sources, the average
American eats dioxin in daily quantities ranging from 3 to 50
picograms, thus exceeding the EPA’s “safe” dose of 0.42 picograms
by anywhere from seven-fold to 120-fold, depending on whose data
you accept regarding dioxin contamination of our food supply. [1, pgs. 94-
95.].
Here is the basic problem: if the EPA’s stringent 1985 standard
is warranted, then the dioxin in our food supply represents a
major failure of public health protection. Naturally, therefore,
it is in the interests of EPA itself–which does not want to look
like a failure–AND of the dioxin dumpers in the paper industry
(and others)–who do not want to look like thoughtless
poisoners–to find “new” evidence making dioxin appear less
potent. Unfortunately, all the new evidence seems to be pointing
in the other direction.
Dioxin is never produced intentionally; dioxin serves no useful
purpose and, so far as anyone knows, there are no benefits from
dioxin in your body, only risks. Nevertheless, dioxin is created
in major quantities as a byproduct: from chlorine bleaching of
pulp and paper, from manufacture of certain herbicides (e.g.,
2,4,5-T), from manufacture of many plastics (e.g., PVC), from
manufacture of many chlorinated hydrocarbon chemicals, and from
incineration of municipal solid wastes.
At the heart of the dioxin problem is chlorine. Chlorine is a
highly reactive chemical (it tries to hook onto anything it
touches, to form a new chlorinated molecule). Because it is so
reactive, chlorine almost never occurs in a free state in nature;
it is all bound up in the very stable molecule known as sodium
chloride, or table salt.
Starting at the turn of this century Dow Chemical, and later
other firms, began producing free chlorine as they split salt to
get sodium, which they sold commercially as sodium hydroxide
(caus-tic soda). Then they began to invent uses (to create
markets) for all the waste chlorine, and thus the chemistry of
“chlorinated hydrocarbons” was developed. Unfortunately,
chlorinated hydrocarbons–solvents, pesticides, plastics, and a
host of other chemicals–have turned out to be uniquely
persistent, uniquely able to accumulate in food chains, and
uniquely toxic in fish, birds and mammals, like humans.
Now, with EPA’s dioxin reassessment chugging along, a new body of
knowledge about the toxicity of dioxin is developing rapidly. A
review article in SCIENCE NEWS (Vol. 141, January 11, 1992, pgs.
24-27) summarizes current understanding of dioxin’s toxicity–and
there is nothing in the new picture that would be comforting to
the paper industry or to its fellow dioxin polluters in
chemicals, plastics, pesticides or solid waste incineration.
Dioxin has always baffled toxicologists because it produces
different effects in different species, and different effects
within the same species at various doses. But the new science of
dioxin is beginning to explain these mysteries by viewing dioxin
as a hormone. Hormones are chemical messengers that travel
throughout the body turning on and off various chemical switches.
Hormones need only be present in tiny quantities to set off a
cascade of major changes in bodily systems, changes not limited
to cancer.
Linda Birnbaum–a key member of EPA’s team reassessing
dioxin–told SCIENCE NEWS, “If you think of TCDD as a hormone, it
makes it easier to understand these very big differences [in
dioxin’s behavior].”
[Continued next week.]
–Peter Montague, Ph.D.
===============
[1] Agency for Toxic Substances and Disease Registry,
TOXICOLOGICAL PROFILE FOR 2,3,7,8-TETRACHLORODIBENZO-P-DIOXIN
[ATSDR/TP-88/23] (Springfield, VA: National Technical Information
Service [NTIS], 1989); available from NTIS [phone (703) 487-4650]
as publication number PB89-214522.
Descriptor terms: epa; dioxin; dioxin reassessment; william
reilly; greenpeace; alder-hill associates; international paper;
georgia-pacific; simpson paper; champion international;
standards; chlorine; dow chemical; hormones;