1 WHO Vanadium Guidance_20170726

Chapter 6.12
General Description
Vanadium
Vanadium (V) is a bright white ductile metal belonging to group V of the periodic system of
elements. It forms compounds mainly in valence states +3, +4 and +5. In the presence of
oxygen, air or oxygenated blood, or oxidizing agents, vanadium is always in the +5 oxidation
state. In the presence of reducing agents, vanadium compounds are in the +4 oxidation state
(1). Vanadium forms both cationic and anionic salts, and can form covalent bonds to yield
organometallic compounds which are mostly unstable.
Sources
Vanadium is an ubiquitous metal. The average concentration of vanadium in the earth's crust
is 150 µg/g (2); concentrations in soil vary in the range 3-310 µg/g (3) and may reach high
values (up to 400 µg/g) in areas polluted by fly ash (4). The concentration of vanadium in
water is largely dependent on geographical location and ranges from 0.2 to more than 100
µg/litre in freshwater (2), and from 0.2 to 29 µg/litre in seawater (3). The ocean floor is the
main long-term sink of vanadium in the global circulation (4). The concentrations of
vanadium in coal and crude petroleum oils vary widely (1-1500 mg/kg) (2).
The world production of vanadium was about 35 000 tonnes in 1981 (S), the major
producing countries being Chile, Finland, Namibia, Norway, South Africa, USSR and the
United States.
Most of the vanadium produced is used in ferrovanadiurn and, of this, the majority is used
in high-speed and other alloy steel (usually combined with chromium, nickel, manganese,
boron and tungsten).
It has been estimated that around 65 000 tonnes of vanadium annually enter the
environment from natural sources (crustal weathering and volcanic emissions) and around
200 000 tonnes as a result of man's activities (6). The major anthropogenic point sources of
atmospheric emission are metallurgical works (30 kg per tonne of vanadium produced),
followed by the burning of crude or residual oil and coal (0.2-2 kg per 1000 tonnes and 30-
300 kg per 106 litres) (7).
Global vanadium emissions into the atmosphere from coal combustion in 1968 were
estimated to range from 1730 to 3760 tonnes. The contribution of vanadium to the
atmosphere from residual -fuel combustion was estimated at 12 400-19 000 tonnes in 1969
and 14 000-22 000 tonnes in 1970. In the production of ferrovanadiurn for alloy additions in
steel -making, vanadium emission to the atmosphere was estimated at 144 tonnes in 1968 (2).
The burning of wood, other vegetable matter and solid wastes probably does not result in
significant vanadium emission. In 1972, about 94% of all anthropogenic emissions of
vanadium to the atmosphere in Canada (2065 tonnes) resulted from the combustion of fuel oil
and only 1.2% from metallurgical industries (8).
Occurrence in air
Currently the ambient air levels of vanadium are quite low, but it is suspected that air
concentrations will increase in the future as a function of accelerated fossil -fuel combustion
in rural areas.
Concentrations vary from tenths of nanograms to a few nanograms. In the air of big cities
the annual average was between 50 and 100 ng/m3 (8,9) with significant seasonal variations
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Chapter 6.12 Vanadium Air Quality Guidelines - Second Edition
(winter averages are more than three times the summer averages). More recent data from a
five-year study in four Belgian cities show yearly averages of 41-179 ng/m3 (10). A recent
survey of measurements in Member States of the European Community indicates the
following concentration ranges: remote areas, 0.001-3 ng/m3; urban areas, 7-200 ng/m3;
industrial areas, 10-70 ng/m3 (11). Concentrations up to 2 µg/m3 have been reported in several
cities in the northeastern USA. A marked decline of vanadium concentration in ambient air
was reported after the introduction of low -sulfur fuels (4). Air pollution by industrial plants
may be less than that by power stations and heating equipment. The average concentration in
the area surrounding a steel -plant site in Pennsylvania, USA, was 72 ng/m3 (2). Vanadium
pentoxide (V205) was detected near a large metallurgical works in concentrations ranging
from 0.98 to 1.49 µg/m3 in 87% of samples and exceeding 2 µg/m3 in 11 % of samples (12).
With combustion of the carbonaceous matrix, vanadium is released to the atmosphere as
fine fly ash with a long atmospheric residence time. Vanadium concentrates on the surface of
particulate matter from coal combustion. The concentration of vanadium in fly ash from
residual fuel -oil burning averages around 8% (range 2-18%), representing 56% (39-74%) of
the vanadium concentration in fuel. The soluble fraction of fly ash vanadium averages 70%
(42-96%). About 80% of the vanadium -containing particles have a mass median aerodynamic
diameter smaller than 0.5 µm at the chimney, representing 10-20% of the total aerosol mass
of vanadium (13).
A large number of occupations involve exposure to vanadium. Concentrations in the
working environment range from 0.01 to 30 mg/m3 (14), with varying particle distribution
patterns and different degrees of solubility for different vanadium compounds. Very high
levels of vanadium in the air were reported in boiler cleaning (17-60 mg/m) (15).
Routes of Exposure
Air
Concentrations of airborne vanadium have increased in recent years, probably because of the
increasing direct combustion of crude oil residues in power plants and community -heating
systems. The average annual values for urban areas are reported to be in the range of 0.05-
0.18 µg/m3. Maximum concentrations of vanadium as high as 2 µg/m3 occur in areas of
greatest population density, during the coldest part of the year and during the late evening
hours.
Drinking -water
Concentrations of vanadium in drinking -water may range from about 0.2 to more than 100
µg/litre (16); typical values appear to be between 1 and 6 µg/litre (8). The concentration of
vanadium in drinking -water depends significantly on geographical location.
Food
The few data on vanadium concentrations in food vary considerably; this may be explained
by differences in the food itself and in the analytical methods used. The mean vanadium
concentration in the diet was reported to be 32 µg/kg (range 19-50 µg) (17) and the mean
daily intake was estimated to be 20 µg/day (18). Byrne & Kosta (19) estimated that the daily
dietary intake of vanadium amounts to several tens of micrograms.
The concentration of vanadium in human milk was found to be 0.1-0.2 ng/g (18). An
infant drinking one litre of human milk per day would thus have a daily vanadium intake of
0.1-0.2 µg (8).
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Chapter 6.12 Vanadium Air Quality Guidelines - Second Edition
Relative significance of different routes of exposure
According to a pathway analysis (8), an individual living in a rural environment (assumed air
concentration 8 ng vanadium per m3) will have a body -burden of around 100 µg, over 80% of
which is derived from the diet; an urban dweller (assumed air concentration 70 ng/m) will
have a total body -burden of around 200 µg (in the latter case, the inhalation route contributes
approximately one half of the total burden).
It was estimated that the daily intake by ingestion is about 20 µg and by inhalation 1.5 µg
in an urban area and 0.2 µg in a rural area (8).
Kinetics and Metabolism
Absorption
The lungs are a significant site of entry of vanadium in the case of community exposure. The
distribution pattern of particles and the solubility of vanadium compounds, as well as alveolar
and mucociliar clearance, are important factors that determine the rate of absorption in the
respiratory tract. Moreover, the irritative effect of vanadium compounds can significantly
modify the absorption of vanadium by the lungs. Vanadium accumulates in the human lung
with age, reaching approximately 6.5 µg/g in the over-65 years age group (3). The lung
clearance of vanadium pentoxide is relatively rapid in animals after acute exposure, but
substantially slower after chronic exposure. The metal is deposited in the lung in relatively
insoluble forms. Soluble compounds are partly absorbed, but the extent of absorption in the
respiratory tract has not been determined.
The absorption rate of vanadium compounds after ingestion depends on their solubility
and chemical nature. Absorption of cationic vanadium is low, not exceeding 0.1-1% (8). Skin
is probably a minor route of absorption in man (9).
Distribution
Absorbed vanadium is transported mainly in the plasma, bound to transferrin. The average
value for the distribution of blood vanadium between plasma and cells in rats after an
intravenous injection of 0.9-30 µg vanadium per kg was found to be 9 : 1 (20). Pentavalent
vanadium is reduced in erythrocytes to the tetravalent form. This reduction is a glutathione-
dependent process (21).
Byrne & Kosta (19) reported blood vanadium levels in healthy individuals of below 0.5
µg/litre. The analytical method used was neutron activation analysis with pre -separation of
vanadium.
Vanadium is widely distributed in body tissues; principle organs of vanadium retention
are kidneys, liver, testicles, spleen and bones. A major fraction of vanadium from cellular
vanadium was found retained in nuclei (22). In pregnant rats the injected vanadium was
found in the fetus (23).
Elimination
Vanadium is excreted mainly in the urine, but also in the faeces. Bile is probably not an
important pathway for excretion into the faeces, but the existence of alternative routes for
excretion into the gut (salivary excretion or direct transfer across the intestinal wall) has been
suggested (20). When 4.5-9.0 mg vanadium as diammonium oxytetravanadate was fed daily
to 16 elderly persons, urinary excretion, although quite variable, amounted to a mean of 5.2%
of the amount ingested (24).
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Chapter 6.12 Vanadium Air Quality Guidelines - Second Edition
Health Effects
Nutritional studies have shown that vanadium is an essential element for the chick and rat (3).
Its deficiency may result in growth reduction, impairment of reproduction and disturbances in
lipid metabolism. Vanadium is also essential for soil nitrogen -fixing microorganisms (3). It
may play a significant role in human nutrition (2).
Biochemical, physiological and pharmacological properties of vanadium compounds have
been reviewed (1,25). It has been suggested that vanadium may be a regulatory agent for
enzymatic activities in mammalian tissues. Vanadium is a potent inhibitor of many enzymes,
while it stimulates adenylate cyclase. It has been shown to inhibit cholesterol biosynthesis
and lower plasma cholesterol levels. Vanadium can also directly influence glucose
metabolism in vitro and may play a role in its regulation. Lipid peroxidation of rat lung
extracts, liver microsomes and mitochondria was induced by sulfite and accelerated by the
presence of vanadium compounds.
Vanadium may play a physiological role as part of a control on levels of the endogenous
antioxidant, glutathione. This may also be important with respect to toxic interactions of
chemicals (26).
Effects on experimental animals
The toxicity of vanadium has been found to be high when it is given parenterally, low when it
is orally administered, and intermediate in the case of respiratory exposure. Toxicity is
related to the valency of the vanadium compound (increasing with increasing valency).
Vanadium is toxic both as a cation and as an anion (16,27).
Severe acute exposure (tens of mg/m3) is responsible for systemic effects. Most frequent
findings in animal experiments were in the liver, kidneys, gonads and the nervous,
haematological and cardiovascular systems (2, 3,16). However, systemic effects at very low
levels of exposure were also reported (28). When rats were continuously exposed to an
aerosol of vanadium pentoxide at levels of 6 and 27 µg/m3 (3.4-15 µg vanadium per in),
neurotoxic effects appeared 30 days from the start of exposure. Measured chronaxy ratio
between the flexor and extensor muscles of the tibia returned to normal about 18 days
following cessation of exposure. Histopathological changes observed in the liver following
the higher level of inhalation exposure (27 µg/m3 for 70 days) included central vein
congestion with scattered small haemorrhages, and granular degeneration of hepatocytes. The
kidneys showed marked granular degeneration of the epithelium of the convoluted tubules. In
the heart, myocardial vascular congestion was observed, with focal perivascular
haemorrhages.
Numerous studies reported acute or chronic respiratory effects in laboratory animals
following exposure to different vanadium compounds. Respiratory effects in rats at relatively
low levels of vanadium pentoxide aerosol (3-5 mg/m3) for 2 hours every other day for 3
months, included perivascular oedema, capillary congestion, haemorrhages, and in some
cases desquamative bronchitis or pneumonia (29). Similar effects were also observed at much
lower levels. Rats exposed to vanadium pentoxide aerosol of 27 µg/m3 for 70 days developed
different respiratory effects, such as marked lung congestion, focal lung haemorrhages and
extensive bronchitis (28). Exposure to 2 µg vanadium pentoxide per m3 was considered to be
without effect.
Exposure to vanadium oxides may alter alveolar macrophage integrity and function to the
detriment of pulmonary defence. Cytotoxicity, tested on rabbit alveolar macrophages in vitro,
was directly related to solubility in the order V205 > V203 > V02. Dissolved vanadium
pentoxide (6 µg/ml) also reduced phagocytosis (3). The effect of vanadium compounds on the
function of alveolar macrophages may result in an impairment of the lung's resistance to
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Chapter 6.12 Vanadium Air Quality Guidelines - Second Edition
secondary bacterial infection.
It has been stated that VOC12 is a mutagen for Escherichia coli and VOC12, V205,
NH4VO3 are capable of damaging DNA (30). There is no information that vanadium
compounds have embryotoxic, teratogenic and carcinogenic effects.
Effects on humans
Both acute and chronic poisonings have been described in workers engaged in the industrial
production and use of vanadium. Most of the reported clinical symptoms reflect irritative
effects of vanadium on the respiratory
There is insufficient evidence that vanadium causes generalized systemic effects except at
extremely high concentrations (3). Several observers described only vague, general signs or
symptoms and reported nervous disturbances, neurasthenic or vegetative symptoms,
occasionally tremors, palpitation of the heart, high incidence of extrasystoles, changes in the
blood picture (anaemia, leukopenia, punctatebasophilia of the erythrocytes), reduced level of
cholesterol in the blood, etc. (16).
Numerous studies have reported acute and chronic respiratory effects mainly due to
exposure to vanadium pentoxide (2,3,16). Most of the reported clinical symptoms reflect
irritative effects of vanadium on the upper respiratory tract. Only at high concentrations
(above 1 mg vanadium per m3) were more serious effects of the lower respiratory tract
observed, such as bronchitis and pneumonitis. Respiratory effects after acute or chronic expo-
sure to low levels of vanadium are summarized in Table 1.
Acute changes in lung function in workers exposed to vanadium compounds during
cleaning of boilers were reported (time -weighted average concentration of respirable dust 523
µg/m3, 15.3% of vanadium, giving a value of 80 µg vanadium per m3) (31). In spite of the
fact that the workers wore respirators, the changes in lung function developed within 24
hours and pre -exposure levels had not returned by the eighth day; however, the efficacy of
the respirators was low (about 9% leakage).
Respiratory effects after acute exposure to vanadium pentoxide dust were also observed
in a clinical study in which healthy volunteers were exposed to levels of 100, 200 and 1000
µg vanadium pentoxide per in for 8 hours (32). It was found that 98% of the particles were
smaller than 5 µm. Coughing, which persisted for several days, was the most characteristic
symptom at all three levels of exposure.
Chronic inhalation of vanadium pentoxide dusts in industry has resulted in rhinitis,
pharyngitis, bronchitis, chronic productive cough, wheezing, shortness of breath and fatigue.
Pneumonitis and bronchopneumonitis have also been observed (2, 3,16). It has been reported
that vanadium workers are more susceptible to colds and other respiratory illnesses than
others.
Respiratory effects after chronic exposure to vanadium pentoxide were described in
refinery workers (33) at an average level of 300 µg vanadium per m3 and at a maximum
concentration of about 1 mg vanadium per in (92% of the particles were smaller than 0.5
µm). In comparison to controls, a statistically significant higher incidence of symptoms,
described as cough with sputum production, eye, nose and throat irritation, injected pharynx
and green tongue were reported.
In workers exposed for several months to vanadium -containing dust in the range of 10-40
µg vanadium per in (concentrations were previously higher, 200-500 µg vanadium per m3), a
macroscopic and microscopic survey of the upper respiratory tract of 63 males was
performed (34). The results were compared with a control group of workers exposed to inert
dust only, and matched for age and smoking habits. Microscopic examination of nasal smears
revealed a statistically significant increase in neutrophils, and biopsies of nasal mucosa
showed significantly elevated numbers of plasma and round cells. The histological picture
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Chapter 6.12 Vanadium Air Quality Guidelines - Second Edition
was characteristic for an irritating effect of vanadium dust on the mucous membranes seen
earlier in exposed laboratory animals.
One study described a significant incidence (58%) of injected pharynx in workers
engaged in the refining of vanadium pentoxide from soot generated by the combustion of
heavy fuel -oil (35). Concentrations of vanadium in the air at various locations in the work
environment were all less than 400 µg/m3, with mean values of 1.2-12.0 µg/m3.
Vanadium compounds appear to be capable of inducing asthma bronchiale in previously
nonatopic subjects and continuing manifestations of asthmatic symptoms were reported 8
weeks after subjects had left the industry (vanadium pentoxide refinery) (36).
Some epidemiological data have shown positive correlations between the vanadium
content of urban air and mortality from bronchitis, pneumonia, nephritis, cancer (other than
lung cancer in males) (37) and "heart disease" (38). However, these analyses did not take into
account important, probably relevant, factors such as exposure to other chemicals, smoking
habits, etc. (16). In addition, most of these causes of excess mortality have not been reported
in workers occupationally exposed to vanadium compounds (3).
Evaluation of Human Health Risks
Exposure
The natural background level of vanadium in air has been reported to range from 0.02 to 1.9
ng/m3 in Canada (2). Vanadium concentrations recorded in rural areas varied from a few
nanograms to tenths of a nanogram per m3, and in urban areas from 50 to 200 ng/m3. In big
cities during winter, when high -vanadium fuel -oil was used for heating purposes,
concentrations as high as 2000 ng/m3 have been reported. Air pollution by industrial plants
may be less than that caused by power stations and heating equipment.
The concentrations of vanadium in workplace air (0.01-60 mg/m3) are much higher than
in the general environment.
Health risk evaluation
The acute and chronic effects of vanadium exposure on the respiratory system of
occupationally exposed workers should be regarded as the most significant factors when
establishing air quality guidelines. Most of the clinical symptoms reported reflect irritative
effects of vanadium on the upper respiratory tract, except at higher concentrations (above 1
mg vanadium per m3), when more serious effects on the lower respiratory tract are observed.
Clinical symptoms of acute exposure are reported (31) in workers exposed to concentrations
ranging from 80 µg/m3 to several mg vanadium per m3, and in healthy volunteers (32)
exposed to concentrations of 56-560 µg vanadium per m3 (Table 1).
A study of occupationally exposed groups provides data reasonably consistent with those
obtained from controlled acute human exposure experiments, suggesting that the lowest -
observed -adverse -effect level for acute exposure can be considered to be 60 µg vanadium per
In
Chronic exposure to vanadium compounds revealed a continuum in the respiratory
effects, ranging from slight changes in the upper respiratory tract, with irritation, coughing
and injection of pharynx, detectable at 20 µg vanadium per m3, to more serious effects such
as chronic bronchitis and pneumonitis, which occurred at levels above 1 mg/m3. Occupational
studies illustrate the concentration -effect relationship at low levels of exposure (33-35),
showing increased prevalence of irritative symptoms of the upper respiratory tract; this
suggests that 20 µg vanadium per m3 can be regarded as the lowest -observed -adverse -effect
level for chronic exposure (Table 1). There are no conclusive data on the health effects of
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Chapter 6.12 Vanadium Air Quality Guidelines - Second Edition
exposure to airborne vanadium at present concentrations in the general population, and a sus-
ceptible subpopulation is not known. However, vanadium is a potent respiratory irritant,
which would suggest that asthmatics should be considered a special group at risk.
There are no well documented animal data to support findings in human studies, although
one study reported systemic and local respiratory effects in rats at levels of 3.4-15 µg/m3 (28).
Guidelines
Available data from occupational studies suggest that the lowest -observed -adverse -effect
level of vanadium can be assumed to be 20 µg/m3, based on chronic upper respiratory tract
symptoms. Since the adverse nature of the observed effects on the upper respiratory tract
were minimal at this concentration and a susceptible subpopulation has not been identified, a
protection factor of 20 was selected. It is believed that below 1 µg/m3 (averaging time 24
hours) environmental exposure to vanadium is not likely to have adverse effects on health.
The available evidence indicates that the current vanadium levels generally found in
industrialized countries are not in the range associated with potentially harmful effects.
Table 1. Respiratory effects after acute and chronic exposures to low levels of vanadium
Type of exposure Vanadium Concentration in µg/m Symptoms Reference
compound
Compound Vanadium
Acute
Boiler cleaning
V205 523
80 Changes in parameters of lung (31)
V203
functions
Clinical study
V205 1000
560 Respiratory irritation: (32)
(experimental 8-
persistent and frequent cough,
hour exposure)
expiratory wheezes
V205 200
112 Persistent cough (7- 10 days)
V205 100
56 Slight cough for 4 days
Chronic
Vanadium refinery
V205
536 300 Respiratory irritation: cough, (33)
sputum, nose and throat
irritation, injected pharynx
Vanadium refinery
V205
18-71 10-40 Irritative changes of mucous (34)
membranes of upper
respiratory tract
Vanadium
V205
1.2-12.0 Respiratory irritation: injected (35)
processing
V203
pharynx
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Chapter 6.12 Vanadium Air Quality Guidelines - Second Edition
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Chapter 6.12 Vanadium Air Quality Guidelines - Second Edition
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