New Studies
Indicate Florida Has a Major Mercury
Problem, with high levels of mercury in: saltwater fish and shellfish,
freshwater fish, rain, all sewer plants and sewer sludge, crops where sludge is
spread, many adults and children, and widespread adverse health effects B. Windham (Ed.)
1. Studies document that Florida Saltwater fish,
shellfish, and freshwater fish have high levels of mercury in large parts of
the state.
2. There
are fish consumption warnings/limits for king mackerel and shark in all parts
of the state and consumption warnings on jack crevalle,
spotted sea trout, Spanish mackerel, gafftopsail
catfish, and lady fish in some areas. A
study found that spotted sea trout in Eastern Florida Bay commonly exceed the
1.5 ppm no consumption mercury level.
3. Five Gulf saltwater species have average mercury levels
on tested samples higher than the FDA action level for fish; 27 species have
average mercury test levels above the FDA warning level for mercury in fish
with some above the action level, and 16 species of fish as well as crabs,
oysters and shrimp have average test levels near the warning level or some
tested above the FDA action level. All
of these have levels about the EPA health criterion for methylmercury
in fish and shellfish tissue.
4.
Studies have found that people who eat
Gulf Coast fish at least once per week usually have dangerous levels of
mercury. 29% of a coastal sample ate fish at least once per week. Studies have found adverse health
effects for those who eat fish at below the FDA warning level.
5. Studies have found that fish and shellfish that feed
near offshore oil and gas platforms have higher levels of mercury than other
areas.
6. Studies have found that freshwater predator fish
such as bass, pickerel, and bowfin have high levels of mercury in most of the
state, with fish consumption warnings issued. 8 other species have average test
levels near the warning level or some tested above the FDA action level.
7. Studies have found that predator species such as wading
birds, alligators, and Florida Panthers whose diet depends on fish have high
levels of mercury, and adverse health and reproductive effects. Livers of cormorants in Florida Bay were
found to have mercury levels as high as 250 ppm,
higher than any previously tested in Florida.
8. Studies by the Oak Ridge National Laboratory(ORNL) have
found high levels of dangerous forms of mercury in landfill gas being emitted
from Florida landfills and from lands where sewer sludge is spread, due to methylation of mercury to methyl and dimethyl
mercury by soil bacteria.
9. All
sewer plants and sewer sludge in Florida have dangerous levels of mercury , which is a major source of mercury in fish and
source of mercury in crops and rain where sewer sludge is spread. High levels
of mercury are being found in rain throughout Florida and the U.S., including
methyl mercury from landfills and land spreading. The most common source of
these high mercury levels was found to be human excretion into home and
business sewers from those with amalgam dental fillings.
10. The largest source
of mercury in most adults is amalgam dental fillings, but food is a significant source in those who
eat fish or shellfish frequently.
11. The 3 main sources of mercury in Florida infants are
mercury thimerosal in vaccinations; mercury from mother's amalgam dental
fillings transferred across the placenta to the fetus or through mother's milk
to the infant; and mercury from fish. These are all significant sources in
Florida.
12. The
National Academy of Sciences found that 50% of U.S. pregnancies result in birth
defects or infants who have significant developmental effects such as ADD,
dyslexia, mood or anxiety disorders, learning disabilities, eczema, asthma, or
other chronic allergies or health problems. Studies document that the majority
of these are due to toxic exposures, with the most common and significant being
mercury.
13. The U.S. CDC and National Academy of Sciences found
that at least 10% of U.S. womenhave mercury levels
high enough to cause developmental neurological conditions inprenatally
exposed infants; this may be higher in Florida due to higher than averagemercury levels in fish and high levels of fish
consumption. The
tests used mainly measured methyl mercury, and did not significantly assess
exposure levels from dental amalgam which is the largest source of mercury in
many adults or infant vaccinations which are the largest sources in infants.
14.
Mercury exposure is cumulative from the
various sources and bioaccumulates over time, with
different sources more significant in different individuals. Health effects are
synergistic between the different forms of mercury exposure and other toxic
exposures, and depend also on individual susceptibility which varies widely‑
due to immune reactivity and systemic detoxification differences of
individuals.
15.
Levels of mercury in South Florida Everglades fish and wildlife declined at least 80% after
mercury emissions from South Florida incinerators were required to control
emissions.
Documentation:
High levels of mercury have been found
in the rain throughout Florida
and the U.S.(34,16,24), resulting in accumulation of
mercury in the
environment, water bodies, fish, wildlife, and
people of Florida. Mercury in Florida rainfall measured more than five times
the federal health standard for lakes(34). The largest
sources of emissions have been found to be coal power plants, incinerators, kilns(16). The level
of mercury in rain ranged from 1.3 to 81.2 nanograms per
liter depending on location and weather conditions, with an average of 12.6. This resulted in depostition
of and average annual depostion of about 17.6
micrograms of mercury per square meter, much higher than the U.S. EPA health
criteria to prevent harm to wildlife and humans(33). The Electric Power Research Institute(2) and
other studies have found that only ½ gram of mercury is required to contaminate
all predator fish in a 10 acre lake to the extent that fish consumption
warnings are required, and enough mercury is being released into the
environment of Florida to raise levels in all fish to such a level.
Mercury
has been found to be the most toxic substance commonly come in contact with, so
toxic that the drinking water standard for mercury is 2 parts per
billion(ppb). But U.S. EPA have found
that because mercury bioaccumulates in the
environment and fish, to protect from accumulation in fish and wildlife and
thus human health even lower standards appear to be needed and lower standards
have been proposed or adopted in many areas(13e). The Great Lakes Initiative Wildlife Criteria
calculated needed to prevent accumulation in fish and wildlife is 1.3 nanagrams per Liter(ng/L) while the GLI Hunan Health Criteria is 3.1 ng/L(parts per trillion). The EPA Fish Tissue Methyl
Mercury-based Criteria for lakes is 7.8 ng/L
and for rivers is 18 ng/L. The California Toxics Rule
Saltwater Criteria is 25 ng/L(13e,33,34).
According
to Government agencies due to its extreme toxicity and common exposures,
mercury causes adverse health effects in large numbers of people in the
U.S.[1,14-16,21,28]. Based on widespread
tests, the U.S. CDC estimates that approx. 16 % of women of childbearing age, 6
million women, have current mercury levels that would put fetuses at risk of
developmental neurological problems(14), without
considering other common sources of mercury in infants. The level affected is
likely highly understated due to the fact that blood is known to
not be a reliable indicator of mercury body burden and is not a good
indicator of mercury vapor exposure from dental amalgams or dental office
occupational exposure, which is higher in many
people than mercury from fish.
Studies
by EPA have found that the fetus on average has mercury levels 70% higher than
the mother’s blood, putting large numbers of infants over the EPA health safety
guideline of 5.8 parts per billion(14c).
Studies by the National Academy of Sciences have found that 50 % of U.S.
children have significant developmental conditions such as ADD, dyslexia,
autism, learning disabilities, mood or anxiety disorders, eczema, asthma,
chronic allergies, etc.(8), and studies have also
documented that the majority of these
are caused by toxics exposures, with mercury exposures being one of the
most common and significant of these(8,14,15,20,21b,27,28).
The
extreme toxicity of mercury can be seen from documented effects on wildlife by
very low levels of mercury exposure. The amount of mercury in the marine
environment is increasing 4.8% per year, doubling every 16 years(6).
A major factor in the extreme decline of wading birds in Florida is mercury
exposure from eating fish and other fish predators are affected as well(7). However levels of mercury in
wading birds and fish in the Everglades area have declined some since controls
were mandated on incinerators a few years ago. Livers of cormorants in Florida Bay were found
to have mercury levels as high as 250 ppm, higher
than any previously tested in Florida(4b). Some Florida panthers that
eat birds and animals that eat fish containing very low levels of mercury(about 1 part per million) have died from chronic
mercury poisoning(7). Since mercury is an estrogenic chemical and reproductive
toxin, many of the rest cannot reproduce. The average male Florida panther has
higher estrogen levels than females, due to the estrogenic properties of mercury(7). Similar is true of some other animals at the top
of the food chain like polar bears, beluga and orca whales, and alligators,
which are affected by mercury and other hormone disrupting chemicals.
Studies
document that Florida Saltwater fish and shellfish have high levels of mercury
in large parts of the state(4,5,9,12,3b). There are
fish consumption warnings/limits for king mackerel and shark in all parts of
the state and consumption warnings on jack crevalle,
spotted sea trout, Spanish mackerel in several estuaries, and on gafftopsail catfish, and lady fish in Tampa Bay (4,9). Some areas such as North Florida Bay and offshore Tampa
Bay have test levels higher than most other areas(4). A study found that spotted sea trout in
Eastern Florida Bay commonly exceed the 1.5 ppm no
consumption mercury level(4b).
Based on
the tests that have been done, eight saltwater species(king mackerel, black
grouper, cobia(ling), barracuda, bonita(little tunny), florida smoothhound, great while shark, tilefish) have average
mercury levels on tested samples higher than the FDA action level of 1 part per
million(ppm) for fish(4,5,12); 24 species had average
mercury test levels above the FDA warning level(0.5 ppm)
for mercury in fish(black drum, blacktip shark,
bluefish, bonefish, bonnethead shark, bull
shark, snook,
greater amberjack, jack crevalle, ladyfish, lemon
shark, red drum, rock bass, spanish mackeral, spotted bass, blackfin tuna, gag
grouper, wahoo, bluefish, gafftopsail
catfish, crevalle jack, ladyfish, and stone
crab) , and 15 species of fish(blacknose shark, blue
crab, grouper spainish,
gulf flounder, permit, red grouper, sand trout, sheepshead,
silver seatrout, southern flounder, tarpon,
tripletail, white bass, yellow bass, yellow jack), as well as crabs, oysters
and shrimp have average test levels near the warning level or some that tested
above the FDA action level(4,12). Approximately 94% of all adult red drum from
offshore waters adjacent to Tampa Bay contained mercury levels greater than or
equal to the 0.5-ppm threshold level, and 64% contained levels greater than or
equal to the DOH 1.5-ppm "no consumption" level (11a). All of these have average levels of mercury
above the U.S. EPA health criterion for methylmercury
of 0.3 ppm(33).
"Coastal
residents have higher levels of mercury than people who live inland, and
anglers and their families are also at higher risk of mercury
exposure,"(5bd).
For a study in Sweden, fresh water
fish consumers were categorized into 3 groups using the break points of at
least once per week, at least once per month, and less than once per month(42). Among the high consumers, median concentrations
of mercury were 8.6 microg/L in blood, 2.4 microg/g in hair, and 1.1 microg/g
creatinine in urine. The relationship between
freshwater fish consumption and mercury was significant in all biological
media. The high-consumption group had much higher mercury levels in blood
(9-fold), hair (7-fold),
and urine (15-fold) than the low-consumption group.
Several studies including a large CDC study
have found those with higher levels of mercury have higher rates of
neurological problems, cardiovascular problems, infertility, and cancer(25,26,30,21). Men in the highest third of hair mercury content
(>2 microg/g) had an adjusted 1.60-fold (95% CI,
1.24 to 2.06) risk of acute coronary event, 1.68-fold (95% CI, 1.15 to 2.44)
risk of CVD, 1.56-fold (95% CI, 0.99 to 2.46) risk of CHD, and 1.38-fold (95%
CI, 1.15 to 1.66) risk of any death compared with men in the lower two thirds(25). High mercury content in hair also attenuated the
protective effects of high-serum docosahexaenoic acid
plus docosapentaenoic acid concentration. Another study
found infertile couples were significantly more likely to have elevated mercury
levels than the infertile couples, which was the case for both men (35 percent
versus 15 percent) and women (23 percent versus 4 percent). Furthermore, patients who reported eating
high levels of seafood showed a clear trend towards elevated mercury levels(26a,f).
A
California health clinic study reports that of a California population that eats at least 2 servings of fish per
week, 89% had levels of mercury in the blood exceeding 5 micrograms per liter(ug/L), the level considered the safety limit for mercury by
U.S. EPA and the National Academy of Sciences(26a). Over 50% had levels over
10 ug/L and 15% had levels over 20 ug/L. The group had
chronic health effects including depression, loss of scalp hair, metallic
taste, headaches, arthritic pain in joints,
irritability, tremors, and numbness and tingling in hands and feet. She also
described cognitive problems such as pronounced memory loss, confusion and
difficulties in talking. In some cases, those problems were so severe
they interfered with the ability to earn a living or attend school. In all cases, health effects improved after several months of avoiding eating fish. Some women in the group were found to have transferred excessive mercury to their infants solely through their breast milk. One breast-fed baby had three times the EPA's safe level for mercury by the time he was 4 months old; and another had 4 times the EPA safe level at 19 months. Some of the infants with high mercury levels suffered severe neurological problems such as autism, and improved when treated for mercury toxicity. Mercury accumulates in the major organs that receive large amounts of blood, with cumulative damage and effects that often are not fully recognized until later in life(43,21).
The Mobile Register studies(5) have also
found that fish and shellfish that feed near offshore oil and gas platforms
have significantly higher levels of mercury than other areas(5) due to mercury
used in drilling. Over 200 tons of mercury has been added to the Gulf through
drilling over the last 30 years. More fishing occurs near such platforms since
shellfish and fish tend to congregate in such areas. Other known major sources
of mercury throughout the coastal area are air emissions and sewer outfalls,
with some other large local industrial sites such as chlor-alkali
plants(16).
Accumulation of atmospheric oxidants and mercury can cause high levels
of mercury deposition in coastal areas when activated by sunlight, which can
result in very high levels of mercury in fish and wild life(32). Bacteria in sediments and fish intestines methylate inorganic mercury to methyl mercury(31).
Studies have found that large pelagic Gulf fish species such
as marlins, swordfish, and shark have levels of mercury 20 to 30 times that of
most Gulf fish species(37). The U.S. FDA recommends
that pregnant women entirely avoid eating shark, swordfish, king mackerel and tilefish(10a), because a significant portion of these types
of fish have mercury levels above the FDA action level of 1 ppm.
However other studies(25,26) including one by the National Academy of
Sciences(14) have found the old FDA action level of 1 ppm
is obsolete and not adequate to protect the public, as adverse effects have
been found for those eating fish at least once per week at average mercury
levels below the FDA warning level of ½ ppm(25). The Health Canada limit for mercury in marine
and freshwater fish is 0.5 ppm(12b) and the U.S. EPA reference level for children and
pregnant women is 0.3 ppm.
Based on this a coalition of organizations using the name
Environmental Working Group(EWG) did a large study to more fully assess mercury
exposure effects and safety limits(12). In addition to the FDA limits, EWG
advises pregnant women, nursing mothers and all women of childbearing age,
should not eat tuna steaks, sea bass, oysters from the Gulf Coast, marlin,
halibut, pike, walleye, white croaker, and largemouth bass(12).
And that these women should eat no more than one meal per month combined of
canned tuna, mahi-mahi, blue mussel, Eastern oyster, cod, pollock,
salmon from the Great Lakes, blue crab from the Gulf of Mexico, wild channel
catfish and lake whitefish. The EWG analysis was based
on 56,000 test results on mercury in fish from 7 different government agencies,
and toxicity studies by U.S. CDC and National Academy of Sciences. A large FDA study found that the average
level of mercury in white canned tuna is 0.358, high enough to require
stringent limits to prevent exceeding EPA’s reference dose(36), since the safe
levels are commonly exceeded.
In a 2010 study, 55% of samples from
the 3 top brands of tuna sold in
the U.S. had mercury levels higher than
the EPA standard of 0.5 parts per
million and 5% had levels over the FDA 1.0 ppm limit for commercially sold
fish(36b).
However EWG recognizes that fish is an important health food
with nutrients and essential fatty acids hard to substitute from other sources.
The following fish are safer choices for avoiding mercury exposure: farmed
trout or catfish, shrimp, fish sticks, wild Pacific salmon, croaker, haddock,
some varieties of flounder, and blue crab from the mid-Atlantic. (12)
Studies
have found that total mercury in
maternal hair is highly
correlated with methyl mercury in cord blood of the fetus. Both hair T-Hg and cord blood methylmercury(MeHg) increased with increasing consumption of seafood or
number of dental fillings(38,39,21), but hair mercury is primarily methylmercury and not highly correlated with number of
dental fillings. Inorganic mercury(I-Hg) in cord blood
increases significantly with increasing number of maternal dental amalgam
fillings(38,39,21). Since dental amalgam
is the largest source of mercury exposure in most people who have several
amalgams and other forms of mercury are methylated by
mouth bacteria and bacteria, yeasts, etc. in the intestines; dental amalgam has
been found to be a large source of methyl mercury in some people. Nutritional
factors have been found to partially offset the neurotoxic
effects of mercury(21). Selenium is commonly found in
many species of fish and partially protects from mercury and methyl mercury
neurotoxicity by preventing damage from free radicals or by forming inactive
selenium mercury complexes(40,41).
Studies have found that freshwater predator fish such as
bass, pickerel, and bowfin have high levels of mercury in most of Florida, with
fish consumption warnings issued(3,4,20). Eight other species (alligator gar,
black crappie, white crappie, blue catfish, flathead catfish, brook trout,
drum, striped bass) have average test levels near the FDA warning level or some
tested above the FDA action level(4). Studies have found that predator species
such as wading birds, alligators, and Florida Panthers whose diet depends on
fish have high levels of mercury, and adverse health and reproductive
effects(7). In recent U.S. EPA tests of fish caught in Florida lakes, every
fish sample tested was contaminated with mercury, and sixty-three percent
contained mercury levels that exceed EPA’s “safe” limit for women of
childbearing age(11b). Nationally, 55 percent of the
fish samples exceeded EPA’s safe mercury limit for women of
childbearing age. Over 2 million acres of Florida’s
surface waters have fish with high levels of mercury, averaging above the
FDA/EPA warning level of 0.5 parts per million(20). The major source of mercury into these water
bodies is air deposition that is brought down in rain. A Florida emissions inventory found that the
major sources of atmospheric mercury were municipal solid waste combustors
(MSW), electric utility industry, and medical waste incinerators(20),
but incinerator emissions have been reduced in recent years.
The most
vulnerable groups to mercury exposure are women who are pregnant or might
become pregnant, nursing mothers, and young children(8,10b,12,27,28).
These groups should limit consumption of freshwater fish to no more than one
meal per week (6 ounces of cooked fish for adults and 2 ounces of cooked fish
for young children).
High levels of mercury
including the very toxic organic forms are being measured in rainfall
throughout the U.S.(24) High levels of the extremely toxic di-methyl
and methyl mercury forms of mercury are being found in landfill gas coming from
landfills and appear to be a source of some of this(22-24). Bacteria in
landfills and in soils where sewer sludge is spread have been found to be methylating elemental and inorganic mercury to the organic forms(22,23). Government studies have found that all sewers
in the U.S. and all sewer sludge have high levels of mercury, with the most
common significant source dental amalgam from dental offices or from being
excreted mercury into sewers from those with amalgam dental fillings(13,23,28,21).
Dental amalgam waste and mercury from sewer sludge are major sources of mercury
in some landfills and sludge is also used in landspreading
on farms and other areas. Programs are already being implemented to reduce most
other sources of mercury into sewers and into landfills such as flourescent light tubes. High levels of mercury have been
found to be taken up in crops on land where sludge is spread(23),
and high levels of emissions of elemental and organic mercury forms methylated by soil bacteria. Health Canada and Canadian
sewer agencies have also documented similar information on mercury emissions
from amalgam waste and sewer sludge to waterways, crops, and air(29),
and have implemented standards and restrictions to help alleviate this problem.
Recent government studies
have documented that the environmental effects of mercury excreted into sewers
from those with amalgam dental fillings are widespread and significant, and are
affecting everyone in Florida(22-24,29). Dental
amalgam mercury has been documented to have a high bioavailability in water(31) and dental offices are a major source of mercury
into waterways. Also the average amalgam
filling has more than ½ gram of mercury, and has been documented to continuously
leak mercury into the body of those with amalgam fillings due to the low
mercury vapor pressure and galvanic current induced by mixed metals in the
mouth. Because of the extreme toxicity of mercury, only ½ gram is required to
contaminate the ecosystem and fish of a 10 acre lake to the extent that a
health warning would be issued by the government to not eat the fish[2]. Over half the rivers and lakes in Florida have such
health warnings[3,4] banning or limiting eating of
fish, and most other states and 4 Canadian provinces have similar health
warnings(6,29). Wisconsin has fish consumption warnings for over 250 lakes and
rivers(6,13) and Minnesota even more, as part of the total of over 95,000 such
lakes with warnings(6), 33% of all U.S. lake surface area and 15% of all U.S.
river miles. All Great Lakes as well as many coastal bays and estuaries and
large numbers of salt water fish carry similar health warnings-70% of all
coastal miles and 100% for the Gulf of Mexico.
Government studies have
determined that dental amalgam is by far the largest source of mercury in
sewers and sewer sludge, with dental amalgam the largest source and waste
excretion from those with amalgam the second largest source(13e). Unlike many European countries and Canada(29) which have more stringent regulation of mercury
that require amalgam separators in dental offices, the U.S. does not and most
dental offices do not have them. The discharge into sewers at a dental office
per dentist without amalgam separators is approximately 270 milligrams per day(18,13e(Table4)). For the U.S. this would be
approximately 5400 kg/yr (or slightly over 6 tons/year of mercury into sewers
and thus into streams and lakes in most cases. In Canada the annual amount
discharged is about 2 tons per year, with portions ending up in waters/fish,
some in landfills and cropland, and in air emissions. The recently enacted
regulations on dental office waste are expected to reduce emissions by at least
63% by 2005, compared to year 2000 levels(29).
A study in Michigan estimated that dental mercury is
responsible for approximately 14 % of mercury discharged to streams(18).
Other EPA and municipal studies(18,13) found that
dental office waste was responsible for similar levels of mercury in lakes,
bays, and streams in other areas throughout the U.S. Another Canadian study
found similar levels of mercury contribution from dental offices into lakes and
streams(29). Surveys of dental office disposal
practices found the majority violated disposal regulations, and dangerous
levels of mercury are accumulating in pipes and septic tanks from many offices(18,29). As
previously noted, dental amalgam mercury has been documented to have a high
bioavailability in water(31).
The total discharge into sewers from
dental amalgam at individual homes and businesses is second only to dental
offices, since the average person with several amalgam fillings excretes in
body waste as much as 100 micrograms per day of mercury and (17,19,21). This has also
been confirmed by medical labs(13c) such as Doctors
Data Lab in Chicago and Biospectron in Sweden which
do thousands of stool tests per year and is consistent with studies measuring
levels in residential sewers by municipalities(13b). The reference average
level of mercury in feces(dry weight) for those tested
at Doctors Data Lab with amalgam fillings is 0.26 milligrams/kilogram, compared
to the reference average level for those without amalgam fillings of .02 mg/kg(ppm). The AMSA study
adopted a more conservative estimate of 27 to 39 micrograms per day(13e). In the
U.S. this would amount to between 2500 to 7300 kilograms per year into sewers
or from 3 to 8 tons per year. Thus the amount of mercury being excreted from
dental amalgam is more than enough to cause dangerous levels of mercury in fish
in most U.S. streams into which sewers empty.
Oak Ridge National Laboratory (ORNL)
studies have also documented high levels of mercury in sewers and sewer sludge(23). According to an EPA study the majority of U.S.
sewerage plants cannot meet the new EPA guideline for mercury discharge into
waterways that was designed to prevent bioaccumulation in fish and wildlife due
to household sewer mercury levels(13). Over 3 tons of
mercury flows into the Chesapeake Bay annually from sewer plants, with numerous
resulting fish consumption advisories for that area and similar for other
areas(6). The EPA discharge rule is being reevaluated due to a National Academy
of Sciences report of July 2000 that found that even small levels of mercury in
fish result in unacceptable risks of birth defects and developmental effects in
infants(14).
However it should be remembered that the
largest sources of mercury air emissions are coal power plants and
incinerators, with additional significant contributions from power plants
burning bunker oil, and these are also significant sources of mercury in
Florida's streams, lakes, and bays(16). Florida ranks 14th nationwide for the most mercury emissions from
power plants, releasing 2,411 pounds of mercury into the air in 2002, according
to the most recent EPA data(11b). The Crystal River
Energy Complex alone emitted 491 pounds of mercury into the air in 2002. Since only
½ gram of mercury is required to contaminate all fish in a 10 acre lake to dangerous
levels requiring health warnings(2), all of these sources need to be reduced to
result in fish safe to eat.
Thousands of peer-reviewed studies have documented that
amalgam dental fillings, in addition to being a major source of mercury in the
environment and fish, are also the number one source of mercury in most people
with several fillings, with exposure levels above Government health guidelines
(21). The Gov't health guideline(MRLs) for
mercury(15) of 0.2 micrograms per kilogram body weight per day for organic
mercury result in limits of approx. 6 micrograms per day for a 44 pound child,
16 ug/d for a 115 pound adult, and 24 ug/day for a large adult. The corresponding MRL for mercury
vapor(the type emitted by amalgam) is 0.2 micrograms
per cubic meter of air breathed which results in a limit of about 6 ug/d for a large adult and less for a child. These levels
are commonly exceeded in people with several amalgam fillings(21)
and in those who regularly eat seafood with mercury levels commonly found in
Florida fish (4, 5,12,etc. ). Thousands of peer-reviewed studies also document
that mercury causes over 30 chronic neurological or immune related health
conditions(21,27,28), from which thousands are documented to have recovered or
significantly improved after proper treatment of mercury toxicity(21b, Section
VI, 20). Those interested in additional information on testing for or
treatments for mercury toxicity or in clinics with experience treating mercury
toxicity problems can contact the Florida Chapter of the national patients
support organization(DAMS) at: www.flcv.com/indexd.html
References
(1) ATSDR/EPA Priority List for 2005: Top 20 Hazardous Substances,
Agency for Toxic Substances and Disease Registry,U.S.
Department of Health and Human Services,
www.atsdr.cdc.gov/clist.html;
&
(b) Agency for Toxic Substances and Disease Registry, U.S. Public Health Service, Toxicological Profile for
Mercury , 1999, &(c) U.S. EPA, Region I, 2001, www.epa.gov/region01/children/outdoors.htm
(2) Electric Power Research Institute. Mercury in the
Environment. Electric EPRI Journal 1990; April, p5; & EPRI
Technical Brief:"Mercury in the Environment", 1993
(3) Florida Department of Health, Bureau of
Environmental Toxicology, Health Advisories for Mercury in Florida Fish 2004, http://www.doh.state.fl.us/environment/community/fishconsumptionadvisories/Fish_consumption_guide.pdf
; & FDEP, Toxic metal levels in Florida
shellfish, 1990; & Mercury Studies in the Florida Everglades, http://sflwww.er.usgs.gov/publications/fs/166-96/
(4) U.S. Geological Survey, The Occurrence of
Mercury in the Fishery Resources of the Gulf of Mexico; http://mo.cr.usgs.gov/gmp/hg.cfm
&, Estuarine Research
Federation
http://erf.org/user-cgi/conference_abstract.pl?conference=erf2001&id=4 ; & http://gill.tamug.tamu.edu/Projects/Articles/hgreport.pdf
& (b)SFWMD, 2003 Everglades
Consolidated Report, Appendix 2B-4: Preliminary Report on Florida Bay Mercury
http://www.sfwmd.gov/org/ema/everglades/consolidated_03/ecr2003/appendices/app2b-4.pdf
and © Florida DOH Mercury
Saltwater Fish Advisories, 2004
www.doh.state.fl.us/environment/hsee/fishconsumptionadvisories/MEFG.htm
& D.H.Adams, R.H.McMichael, Florida Marine Research Institute, Technical
Reports, Mercury Levels in Marine and Estuarine Fishes of Florida, 2001; & Mercury in Marine Fish, Florida Fish & Wildlife Conservation
Commission, http://capmel.com/Mercury_in_fish.htm
&(d)
Mississippi fish warnings, www.deq.state.ms.us/newweb/homepages.nsf & http://www.masgc.org/mercury/abstracts.html
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