Ion, and compounds containing the ion
Chemical compound
A
perchlorate
is a
chemical compound
containing the perchlorate
ion
,
ClO
?
4
, the
conjugate base
of
perchloric acid
(
ionic perchlorate
). As counterions, there can be
metal
cations
,
quaternary ammonium cations
or other ions, for example,
nitronium cation
(
NO
+
2
).
The term
perchlorate
can also describe
perchlorate esters
or
covalent perchlorates
.
[2]
These are organic compounds that are
alkyl
or
aryl
esters
of
perchloric acid
. They are characterized by a
covalent bond
between an
oxygen
atom of the ClO
4
moiety and an
organyl group
.
In most ionic perchlorates, the
cation
is
non-coordinating
. The majority of ionic perchlorates are commercially produced salts commonly used as oxidizers for pyrotechnic devices and for their ability to control
static electricity
in
food packaging
.
[3]
Additionally, they have been used in
rocket propellants
,
fertilizers
, and as
bleaching agents
in the
paper
and
textile industries
.
Perchlorate contamination of food and
water
endangers human health, primarily affecting the
thyroid gland
.
Ionic perchlorates are typically colorless solids that exhibit good
solubility
in
water
. The perchlorate ion forms when they dissolve in water,
dissociating
into ions. Many perchlorate salts also exhibit good
solubility
in non-aqueous
solvents
.
[4]
Four perchlorates are of primary commercial interest:
ammonium perchlorate
(NH
4
)ClO
4
,
perchloric acid
HClO
4
,
potassium perchlorate
KClO
4
and
sodium perchlorate
NaClO
4
.
Production
[
edit
]
Perchlorate salts are typically manufactured through the process of
electrolysis
, which involves oxidizing aqueous solutions of corresponding
chlorates
. This technique is commonly employed in the production of
sodium perchlorate
, which finds widespread use as a key ingredient in
rocket fuel
.
[5]
Perchlorate salts are also commonly produced by reacting
perchloric acid
with bases, such as
ammonium hydroxide
or
sodium hydroxide
.
Ammonium perchlorate
, which is highly valued,
[
why?
]
can also be produced via an
electrochemical
process.
[6]
Perchlorate esters are formed in the presence of a nucleophilic
catalyst
via a perchlorate salt's
nucleophilic substitution
onto an
alkylating agent
.
[7]
Uses
[
edit
]
- The dominant use of perchlorates is as oxidizers in propellants for rockets, fireworks and highway flares. Of particular value is
ammonium perchlorate composite propellant
as a component of solid rocket fuel. In a related but smaller application, perchlorates are used extensively within the
pyrotechnics
industry and in certain munitions and for the manufacture of matches.
[5]
- Perchlorate is used to control
static electricity
in food packaging. Sprayed onto containers it stops statically charged food from clinging to plastic or paper/cardboard surface.
[8]
- Niche uses include
lithium perchlorate
, which decomposes
exothermically
to produce oxygen, useful in
oxygen "candles"
on spacecraft, submarines, and in other situations where a reliable backup oxygen supply is needed.
[9]
- Potassium perchlorate has, in the past, been used therapeutically to help manage
Graves' disease
. It impedes production of the thyroid hormones that contain iodine.
[10]
Chemical properties
[
edit
]
The perchlorate ion is the least reactive of the generalized
chlorates
. Perchlorate contains
chlorine
in its highest oxidation number. A table of reduction potentials of the four
chlorates
shows that, contrary to expectation, perchlorate is the weakest oxidant among the four in water.
[11]
Ion
|
Acidic reaction
|
E
° (V)
|
Neutral/basic reaction
|
E
° (V)
|
Hypochlorite
|
2 H
+
+ 2 HOCl + 2 e
?
→ Cl
2
(
g
) + 2 H
2
O
|
1.63
|
ClO
?
+ H
2
O + 2 e
?
→ Cl
?
+ 2 OH
?
|
0.89
|
Chlorite
|
6 H
+
+ 2 HOClO + 6 e
?
→ Cl
2
(
g
) + 4 H
2
O
|
1.64
|
ClO
?
2
+ 2 H
2
O + 4 e
?
→ Cl
?
+ 4 OH
?
|
0.78
|
Chlorate
|
12 H
+
+ 2 ClO
?
3
+ 10 e
?
→ Cl
2
(
g
) + 6 H
2
O
|
1.47
|
ClO
?
3
+ 3 H
2
O + 6 e
?
→ Cl
?
+ 6 OH
?
|
0.63
|
Perchlorate
|
16 H
+
+ 2 ClO
?
4
+ 14 e
?
→ Cl
2
(
g
) + 8 H
2
O
|
1.42
|
ClO
?
4
+ 4 H
2
O + 8 e
?
→ Cl
?
+ 8 OH
?
|
0.56
|
These data show that the perchlorate and chlorate are stronger oxidizers in acidic conditions than in basic conditions.
Gas phase measurements of heats of reaction (which allow computation of Δ
f
H
°) of various chlorine oxides do follow the expected trend wherein
Cl
2
O
7
exhibits the largest endothermic value of Δ
f
H
° (238.1 kJ/mol) while
Cl
2
O
exhibits the lowest endothermic value of Δ
f
H
° (80.3 kJ/mol).
[12]
The chlorine in the perchlorate anion is a
closed shell
atom and is well shielded by the four oxygen atoms. Most perchlorate compounds, especially salts of
electropositive
metals such as
sodium perchlorate
or
potassium perchlorate
, do not oxidize organic compounds until the mixture is heated. This property is useful in many applications, such as
flares
, where ignition is required to initiate a reaction. Ammonium perchlorate is stable when pure but can form potentially explosive mixtures with reactive metals or organic compounds. The
PEPCON disaster
destroyed a production plant for
ammonium perchlorate
when a fire caused the ammonium perchlorate stored on site to react with the aluminum that the storage tanks were constructed with and explode.
[
citation needed
]
In solution, Ru(II) can reduce
ClO
?
4
to
ClO
?
3
, while V(II), V(III), Mo(III), Cr(II) and Ti(III) can reduce
ClO
?
4
to
Cl
?
.
[13]
Biology
[
edit
]
Over 40 phylogenetically and metabolically diverse microorganisms capable of growth via perchlorate reduction
[14]
have been isolated since 1996. Most originate from the
Pseudomonadota
but others include the
Bacillota
,
Moorella perchloratireducens
and
Sporomusa
sp., and the
archaeon
Archaeoglobus fulgidus
.
[15]
[16]
With the exception of
A. fulgidus
, all known microbes that grow via perchlorate reduction utilize the enzymes
perchlorate reductase
and
chlorite dismutase
, which collectively take perchlorate to innocuous chloride.
[15]
In the process, free
oxygen
(
O
2
) is generated.
[15]
Natural abundance
[
edit
]
Terrestrial abundance
[
edit
]
Perchlorate is created by lightning discharges in the presence of chloride. Perchlorate has been detected in rain and snow samples from
Florida
and
Lubbock, Texas
.
[17]
It is also present in
Martian soil
.
Naturally occurring perchlorate at its most abundant can be found commingled with deposits of sodium nitrate in the
Atacama Desert
of northern Chile. These deposits have been heavily mined as sources for nitrate-based fertilizers. Chilean nitrate is in fact estimated to be the source of around 81,000 tonnes (89,000 tons) of perchlorate imported to the U.S. (1909?1997). Results from surveys of ground water, ice, and relatively unperturbed deserts have been used to estimate a 100,000 to 3,000,000 tonnes (110,000 to 3,310,000 tons) "global inventory" of natural perchlorate presently on Earth.
[18]
On Mars
[
edit
]
Perchlorate was detected in Martian soil at the level of ~0.6% by weight.
[19]
[20]
It was shown that at the Phoenix landing site it was present as a mixture of 60%
Ca(ClO
4
)
2
and 40%
Mg(ClO
4
)
2
.
[21]
These salts, formed from perchlorates, act as
antifreeze
and substantially lower the
freezing point
of water. Based on the temperature and pressure conditions on present-day Mars at the
Phoenix
lander site, conditions would allow a perchlorate salt solution to be stable in liquid form for a few hours each day during the summer.
[22]
The possibility that the perchlorate was a contaminant brought from Earth was eliminated by several lines of evidence. The
Phoenix
retro-rockets used ultra pure
hydrazine
and launch propellants consisting of
ammonium perchlorate
or
ammonium nitrate
. Sensors on board
Phoenix
found no traces of
ammonium nitrate
, and thus the nitrate in the quantities present in all three soil samples is indigenous to the Martian soil. Perchlorate is widespread in Martian soils at concentrations between 0.5 and 1%. At such concentrations, perchlorate could be an important source of oxygen, but it could also become a critical chemical hazard to astronauts.
[23]
In 2006, a mechanism was proposed for the formation of perchlorates that is particularly relevant to the discovery of perchlorate at the
Phoenix
lander site. It was shown that soils with high concentrations of
chloride
converted to perchlorate in the presence of titanium dioxide and sunlight/ultraviolet light. The conversion was reproduced in the lab using chloride-rich soils from
Death Valley
.
[24]
Other experiments have demonstrated that the formation of perchlorate is associated with wide band gap semiconducting oxides.
[25]
In 2014, it was shown that perchlorate and chlorate can be produced from chloride minerals under Martian conditions via UV using only NaCl and silicate.
[26]
Further findings of perchlorate and chlorate in the Martian meteorite EETA79001
[27]
and by the Mars
Curiosity
rover in 2012-2013 support the notion that perchlorates are globally distributed throughout the Martian surface.
[28]
[29]
[30]
With concentrations approaching 0.5% and exceeding toxic levels on Martian soil, Martian perchlorates would present a serious challenge to
human settlement
,
[31]
as well as microorganisms.
[32]
On the other hand, the perchlorate would provide a convenient source of
oxygen
for the settlements.
On September 28, 2015, NASA announced that analyses of spectral data from the Compact Reconnaissance Imaging Spectrometer for Mars instrument (CRISM) on board the Mars Reconnaissance Orbiter from four different locations where recurring slope lineae (RSL) are present found evidence for hydrated salts. The hydrated salts most consistent with the spectral absorption features are magnesium perchlorate, magnesium chlorate and sodium perchlorate. The findings strongly support the hypothesis that RSL form as a result of contemporary water activity on Mars.
[33]
[34]
[35]
[36]
[37]
Contamination in environment
[
edit
]
Perchlorates are of concern because of uncertainties about toxicity and health effects at low levels in drinking water, impact on ecosystems, and indirect exposure pathways for humans due to accumulation in vegetables.
[10]
They are water-soluble, exceedingly mobile in aqueous systems, and can persist for many decades under typical groundwater and surface water conditions.
[38]
Industrial origin
[
edit
]
Perchlorates are used mostly in
rocket propellants
but also in disinfectants, bleaching agents, and herbicides. Perchlorate contamination is caused during both the manufacture and ignition of rockets and fireworks.
[4]
Fireworks are also a source of perchlorate in lakes.
[39]
Removal and recovery methods of these compounds from explosives and rocket propellants include high-pressure water washout, which generates aqueous ammonium perchlorate.
In U.S. drinking water
[
edit
]
In 2000, perchlorate contamination beneath the former flare manufacturing plant
Olin Corporation
Flare Facility,
Morgan Hill, California
was first discovered several years after the plant had closed. The plant had used potassium perchlorate as one of the ingredients during its 40 years of operation. By late 2003, the State of California and the
Santa Clara Valley Water District
had confirmed a groundwater plume currently extending over nine miles through residential and agricultural communities.
[
citation needed
]
The California Regional Water Quality Control Board and the
Santa Clara Valley Water District
have engaged
[
when?
]
in a major outreach effort, a
water well testing
program has been underway for about 1,200 residential, municipal, and agricultural wells. Large ion exchange treatment units are operating in three public water supply systems which include seven municipal wells with perchlorate detection. The
potentially responsible parties
, Olin Corporation and Standard Fuse Incorporated, have been supplying bottled water to nearly 800 households with private wells,
[
when?
]
and the Regional Water Quality Control Board has been overseeing cleanup efforts.
[40]
The source of perchlorate in California was mainly attributed to two manufacturers in the southeast portion of the Las Vegas Valley in Nevada, where perchlorate has been produced for industrial use.
[41]
This led to perchlorate release into
Lake Mead
in Nevada and the
Colorado River
which affected regions of Nevada, California and
Arizona
, where water from this reservoir is used for consumption, irrigation and recreation for approximately half the population of these states.
[4]
Lake Mead has been attributed
[
when?
]
as the source of 90% of the perchlorate in Southern Nevada's drinking water. Based on sampling, perchlorate has been affecting 20 million people, with highest detection in
Texas
, southern California,
New Jersey
, and Massachusetts, but intensive sampling of the
Great Plains
and other middle state regions may lead to revised estimates with additional affected regions.
[4]
An action level of 18 μg/L has been adopted
[
when?
]
by several affected states.
[38]
In 2001, the chemical was detected at levels as high as 5 μg/L at
Joint Base Cape Cod
(formerly
Massachusetts Military Reservation
), over the
Massachusetts
then state regulation of 2 μg/L.
[42]
[43]
As of 2009, low levels of perchlorate had been detected in both drinking water and
groundwater
in 26 states in the U.S., according to the
Environmental Protection Agency
(EPA).
[44]
In food
[
edit
]
In 2004, the chemical was found in cow's milk in California at an average level of 1.3
parts per billion
(ppb, or μg/L), which may have entered the cows through feeding on crops exposed to water containing perchlorates.
[45]
A 2005 study suggested
human breast milk
had an average of 10.5 μg/L of perchlorate.
[46]
From minerals and other natural occurrences
[
edit
]
In some places, there is no clear source of perchlorate, and it may be naturally occurring. Natural perchlorate on Earth was first identified in terrestrial nitrate deposits /fertilizers of the
Atacama Desert
in Chile as early as the 1880s
[47]
and for a long time considered a unique perchlorate source. The perchlorate released from historic use of Chilean nitrate based fertilizer which the U.S.imported by the hundreds of tons in the early 19th century can still be found in some groundwater sources of the United States, for example Long Island, New York.
[48]
Recent improvements in analytical sensitivity using ion chromatography based techniques have revealed a more widespread presence of natural perchlorate, particularly in subsoils of Southwest USA,
[49]
salt evaporites in California and Nevada,
[50]
Pleistocene groundwater in New Mexico,
[51]
and even present in extremely remote places such as
Antarctica
.
[52]
The data from these studies and others indicate that natural perchlorate is globally deposited on Earth with the subsequent accumulation and transport governed by the local hydrologic conditions.
Despite its importance to environmental contamination, the specific source and processes involved in natural perchlorate production remain poorly understood. Laboratory experiments in conjunction with isotopic studies
[53]
have implied that perchlorate may be produced on earth by oxidation of chlorine species through pathways involving ozone or its photochemical products.
[54]
[55]
Other studies have suggested that perchlorate can also be formed by lightning activated oxidation of chloride aerosols (e.g., chloride in sea salt sprays),
[56]
and ultraviolet or thermal oxidation of chlorine (e.g., bleach solutions used in swimming pools) in water.
[57]
[58]
[59]
From nitrate fertilizers
[
edit
]
Although perchlorate as an environmental contaminant is usually associated with the manufacture, storage, and testing of
solid rocket motors
,
[60]
contamination of perchlorate has been focused as a side effect of the use of natural nitrate
fertilizer
and its release into ground water. The use of naturally contaminated nitrate fertilizer contributes to the infiltration of perchlorate anions into the ground water and threaten the water supplies of many regions in the US.
[60]
One of the main sources of perchlorate contamination from natural nitrate fertilizer use was found to come from the fertilizer derived from Chilean
caliche
(
calcium carbonate
), because Chile has rich source of naturally occurring perchlorate anion.
[61]
Perchlorate concentration was the highest in Chilean nitrate, ranging from 3.3 to 3.98%.
[38]
Perchlorate in the solid fertilizer ranged from 0.7 to 2.0 mg g
?1
, variation of less than a factor of 3 and it is estimated that sodium nitrate fertilizers derived from Chilean caliche contain approximately 0.5?2 mg g
?1
of perchlorate anion.
[61]
The direct ecological effect of perchlorate is not well known; its impact can be influenced by factors including rainfall and irrigation, dilution, natural attenuation, soil adsorption, and bioavailability.
[61]
Quantification of perchlorate concentrations in nitrate fertilizer components via
ion chromatography
revealed that in horticultural fertilizer components contained perchlorate ranging between 0.1 and 0.46%.
[38]
Environmental cleanup
[
edit
]
There have been many attempts to eliminate perchlorate contamination. Current
remediation
technologies for perchlorate have downsides of high costs and difficulty in operation.
[62]
Thus, there have been interests in developing systems that would offer economic and green alternatives.
[62]
Treatment ex situ and in situ
[
edit
]
Several technologies can remove perchlorate, via treatments
ex situ
(away from the location) and
in situ
(at the location).
Ex situ treatments include ion exchange using perchlorate-selective or nitrite-specific resins,
bioremediation
using packed-bed or fluidized-bed
bioreactors
, and membrane technologies via
electrodialysis
and
reverse osmosis
.
[63]
In ex situ treatment via ion exchange, contaminants are attracted and adhere to the ion exchange resin because such resins and ions of contaminants have opposite charge.
[64]
As the ion of the contaminant adheres to the resin, another charged ion is expelled into the water being treated, in which then ion is exchanged for the contaminant.
[64]
Ion exchange technology has advantages of being well-suitable for perchlorate treatment and high volume throughput but has a downside that it does not treat
chlorinated solvents
. In addition, ex situ technology of liquid phase carbon adsorption is employed, where granular activated carbon (GAC) is used to eliminate low levels of perchlorate and pretreatment may be required in arranging GAC for perchlorate elimination.
[63]
In situ treatments, such as bioremediation via perchlorate-selective microbes and permeable reactive barrier, are also being used to treat perchlorate.
[63]
In situ bioremediation has advantages of minimal above-ground
infrastructure
and its ability to treat chlorinated solvents, perchlorate,
nitrate
, and
RDX
simultaneously. However, it has a downside that it may negatively affect secondary water quality. In situ technology of
phytoremediation
could also be utilized, even though perchlorate phytoremediation mechanism is not fully founded yet.
[63]
Bioremediation using perchlorate-reducing bacteria, which reduce perchlorate ions to harmless chloride, has also been proposed.
[65]
Health effects
[
edit
]
Thyroid inhibition
[
edit
]
Perchlorate is a potent competitive inhibitor of the thyroid
sodium-iodide symporter
.
[66]
Thus, it has been used to treat
hyperthyroidism
since the 1950s.
[67]
At very high doses (70,000?300,000
ppb
) the administration of potassium perchlorate was considered the standard of care in the United States, and remains the approved pharmacologic intervention for many countries.
In large amounts perchlorate interferes with
iodine
uptake into the
thyroid
gland. In adults, the thyroid gland helps regulate the
metabolism
by releasing hormones, while in children, the thyroid helps in proper development. The
NAS
, in its 2005 report,
Health Implications of Perchlorate Ingestion
, emphasized that this effect, also known as Iodide Uptake Inhibition (IUI) is not an adverse health effect. However, in January 2008, California's Department of Toxic Substances Control stated that perchlorate is becoming a serious threat to human health and water resources.
[68]
In 2010, the EPA's Office of the Inspector General determined that the agency's own perchlorate reference dose of 24.5 parts per billion protects against all human biological effects from exposure, as the federal government is responsible for all US military base groundwater contamination. This finding was due to a significant shift in policy at the EPA in basing its risk assessment on non-adverse effects such as IUI instead of adverse effects. The Office of the Inspector General also found that because the EPA's perchlorate reference dose is conservative and protective of human health further reducing perchlorate exposure below the reference dose does not effectively lower risk.
[69]
Because of ammonium perchlorate's adverse effects upon children, Massachusetts set its maximum allowed limit of
ammonium perchlorate
in drinking water at 2 parts per billion (2 ppb = 2 micrograms per liter).
[70]
Perchlorate affects only thyroid hormone. Because it is neither stored nor
metabolized
, effects of perchlorate on the thyroid gland are reversible, though effects on brain development from lack of thyroid hormone in
fetuses
,
newborns
, and children are not.
[71]
Toxic effects of perchlorate have been studied in a survey of industrial plant workers who had been exposed to perchlorate, compared to a control group of other industrial plant workers who had no known exposure to perchlorate. After undergoing multiple tests, workers exposed to perchlorate were found to have a significant systolic blood pressure rise compared to the workers who were not exposed to perchlorate, as well as a significant decreased thyroid function compared to the control workers.
[72]
A study involving healthy adult volunteers determined that at levels above 0.007 milligrams per kilogram per day (mg/(kg·d)), perchlorate can temporarily inhibit the
thyroid
gland's ability to absorb iodine from the
bloodstream
("iodide uptake inhibition", thus perchlorate is a known
goitrogen
).
[73]
The EPA converted this dose into a
reference dose
of 0.0007 mg/(kg·d) by dividing this level by the standard intraspecies uncertainty factor of 10. The agency then calculated a "drinking water equivalent level" of 24.5 ppb by assuming a person weighs 70 kg (150 lb) and consumes 2 L (0.44 imp gal; 0.53 US gal) of drinking water per day over a lifetime.
[74]
[
needs update
]
In 2006, a study reported a statistical association between environmental levels of perchlorate and changes in thyroid hormones of women with low iodine. The study authors were careful to point out that hormone levels in all the study subjects remained within normal ranges. The authors also indicated that they did not originally normalize their findings for creatinine, which would have essentially accounted for fluctuations in the concentrations of one-time urine samples like those used in this study.
[75]
When the Blount research was re-analyzed with the creatinine adjustment made, the study population limited to women of reproductive age, and results not shown in the original analysis, any remaining association between the results and perchlorate intake disappeared.
[76]
Soon after the revised Blount Study was released, Robert Utiger, a doctor with the Harvard Institute of Medicine, testified before the US Congress and stated: "I continue to believe that that reference dose, 0.007 milligrams per kilo (24.5 ppb), which includes a factor of 10 to protect those who might be more vulnerable, is quite adequate."
[77]
In 2014, a study was published, showing that environmental exposure to perchlorate in pregnant women with hypothyroidism is associated with a significant risk of low IQ in their children.
[78]
Lung toxicity
[
edit
]
Some studies suggest that perchlorate has pulmonary toxic effects as well. Studies have been performed on rabbits where perchlorate has been injected into the trachea. The lung tissue was removed and analyzed, and it was found that perchlorate injected lung tissue showed several adverse effects when compared to the control group that had been intratracheally injected with saline. Adverse effects included inflammatory infiltrates, alveolar collapse, subpleural thickening, and lymphocyte proliferation.
[79]
Aplastic anemia
[
edit
]
In the early 1960s,
potassium perchlorate
used to treat
Graves' disease
was implicated in the development of
aplastic anemia
?a condition where the
bone marrow
fails to produce new
blood cells
in sufficient quantity?in thirteen patients, seven of whom died.
[80]
Subsequent investigations have indicated the connection between administration of potassium perchlorate and development of aplastic anemia to be "equivocable at best", which means that the benefit of treatment, if it is the only known treatment, outweighs the risk, and it appeared a contaminant poisoned the 13.
[81]
Regulation in the U.S.
[
edit
]
Water
[
edit
]
In 1998, perchlorate was included in the U.S. EPA
Contaminant Candidate List
, primarily due to its detection in California drinking water.
[82]
[4]
In 2002, the EPA completed its draft toxicological review of perchlorate and proposed an
reference dose
of 0.00003 milligrams per kilogram per day (mg/kg/day) based primarily on studies that identified neurodevelopmental deficits in rat pups. These deficits were linked to maternal exposure to perchlorate.
[83]
In 2003, a
federal district court
in California found that the
Comprehensive Environmental Response, Compensation and Liability Act
applied, because perchlorate is ignitable, and therefore was a "characteristic" hazardous waste.
[84]
Subsequently, the U.S. National Research Council of the
National Academy of Sciences
(NAS) reviewed the health implications of perchlorate, and in 2005 proposed a much higher reference dose of 0.0007 mg/kg/day based primarily on a 2002 study by Greer et al.
[83]
During that study, 37 adult human subjects were split into four exposure groups exposed to 0.007 (7 subjects), 0.02 (10 subjects), 0.1 (10 subjects), and 0.5 (10 subjects) mg/kg/day. Significant decreases in iodide uptake were found in the three highest exposure groups. Iodide uptake was not significantly reduced in the lowest exposed group, but four of the seven subjects in this group experienced inhibited iodide uptake. In 2005, the RfD proposed by NAS was accepted by EPA and added to its integrated risk information system (IRIS).
- The NAS report described the level of lowest exposure from Greer
et al
as a
NOEL
. However, there was actually an effect at that level although not statistically significant largely due to small size of study population (four of seven subjects showed a slight decrease in iodide uptake).
- Reduced iodide uptake was not considered to be an adverse effect, even though it is a precursor to an adverse effect,
hypothyroidism
. Therefore, additional safety factors, would be necessary when extrapolating from the point of departure to the RfD.
- Consideration of data uncertainty was insufficient because the Greer, et al. study reflected only a 14-day exposure (=acute) to healthy adults and no additional safety factors were considered to protect sensitive subpopulations like for example, breastfeeding newborns.
Although there has generally been consensus with the Greer
et al
study, there has been no consensus with regard to developing a perchlorate RfD. One of the key differences results from how the point of departure is viewed (i.e., NOEL or
LOAEL
), or whether a benchmark dose should be used to derive the RfD. Defining the point of departure as a NOEL or LOAEL has implications when it comes to applying appropriate safety factors to the point of departure to derive the RfD.
[85]
In early 2006, EPA issued a "Cleanup Guidance" and recommended a
Drinking Water Equivalent Level
(DWEL) for perchlorate of 24.5 μg/L.
[
citation needed
]
Both DWEL and Cleanup Guidance were based on a 2005 review of the existing research by the
National Academy of Sciences
(NAS).
[86]
Lacking a federal drinking water standard, several states subsequently published their own standards for perchlorate including Massachusetts in 2006
[
citation needed
]
and California in 2007. Other states, including Arizona, Maryland, Nevada, New Mexico, New York, and Texas have established non-enforceable, advisory levels for perchlorate.
[
citation needed
]
In 2008 EPA issued an interim
drinking water health advisory
for perchlorate and with it a guidance and analysis concerning the impacts on the environment and drinking water.
[87]
California also issued guidance
[
when?
]
regarding perchlorate use.
[88]
Both the
Department of Defense
and some environmental groups voiced questions about the NAS report,
[
citation needed
]
but no credible science has emerged to challenge the NAS findings.
[
citation needed
]
In February 2008, the U.S.
Food and Drug Administration
(FDA) reported that U.S. toddlers on average were being exposed to more than half of EPA's safe dose from food alone.
[89]
In March 2009, a
Centers for Disease Control
study found 15 brands of infant formula contaminated with perchlorate and that combined with existing perchlorate drinking water contamination, infants could be at risk for perchlorate exposure above the levels considered safe by EPA.
In 2010, the
Massachusetts Department of Environmental Protection
set a 10 fold lower RfD (0.07 μg/kg/day) than the NAS RfD using a much higher uncertainty factor of 100. They also calculated an Infant drinking water value, which neither US EPA nor
CalEPA
had done.
[90]
On February 11, 2011, EPA determined that perchlorate meets the
Safe Drinking Water Act
criteria for regulation as a contaminant.
[87]
[91]
The agency found that perchlorate may have an adverse effect on the health of persons and is known to occur in
public water systems
with a frequency and at levels that it presents a public health concern. Since then EPA has continued to determine what level of contamination is appropriate. EPA prepared extensive responses to submitted public comments.
[92]
[
better source needed
]
In 2016 the
Natural Resources Defense Council
(NRDC) filed a lawsuit to accelerate EPA's regulation of perchlorate.
[93]
In 2019, EPA proposed a
Maximum Contaminant Level
of 0.056 mg/L for public water systems.
[94]
On June 18, 2020, EPA announced that it was withdrawing its 2011 regulatory determination and its 2019 proposal, stating that it had taken "proactive steps" with state and local governments to address perchlorate contamination.
[95]
In September 2020 NRDC filed suit against EPA for its failure to regulate perchlorate, and stated that 26 million people may be affected by perchlorate in their drinking water.
[96]
On March 31, 2022, the EPA announced that a review confirmed its 2020 decision.
[97]
Covalent perchlorates
[
edit
]
Although typically found as a non-coordinating anion, a few
metal complexes
are known.
Hexaperchloratoaluminate
and
tetraperchloratoaluminate
are strong
oxidising agents
.
Several perchlorate esters are known.
[2]
For example,
methyl perchlorate
is a high energy material that is a strong
alkylating agent
.
Chlorine perchlorate
is a covalent inorganic analog.
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External links
[
edit
]
- NAS Report: The Health Effects of Perchlorate Ingestion
- NRDC's criticism of NAS report
- Environment California report
Archived
2010-06-09 at the
Wayback Machine
(Executive Summary with link to full text)
- Macho Moms: Perchlorate pollutant masculinizes fish: Science News Online, August 12, 2006
Archived
February 20, 2008, at the
Wayback Machine
- New Scientist Space Blog: Phoenix discovery may be bad for Mars life
- State Threatening To Sue Military Over Water Pollution
Archived
2005-11-09 at the
Wayback Machine
,
Associated Press
, May 19, 2003.
- Health Effects Of Perchlorate From Spent Rocket
,
SpaceDaily.com
, July 11, 2002.
- Dept of Defense, Dept of Energy, and US Environmental Protection Agency's Strategic Environmental Research and Development Program, Elimination of Perchlorate Oxidizers from Pyrotechnic Flare Compositions, 2009
Archived
2007-08-06 at the
Wayback Machine