solutions to mercury pollution,
May 11, 2020

Solutions To Mercury Pollution.Mercury and its risks.Mercury, a heavy metal that accumulates throughout the food chain, peaks in fish. Mercury is one of the common contaminants in food. The risk that it supposes for the health depends on the type of food, of its origin. and of the average content in the same.

What Are Crescent Solutions of Mercury Pollution 2020

solutions to mercury pollution,Above all and this is very important, on the quantity that of that food ingests a population or a determined individual.
Mercury in its natural state is not toxic,

but the various forms that it can take either in nature or as a consequence of industrial or transformation processes are.

As it appears from the extensive bibliography on this heavy metal,

mercury powders and vapors are almost completely resorbed by the pulmonary route. Mercury salts cause skin and mucosal lesions.

And methylmercury, one of the most toxic forms known, readily dissolves in fat and passes the blood-brain barrier and the placenta.

It has mutagenic and teratogenic potential (as a substance proven harmful to fetuses), which is why it has been included in the list of substances that affect pregnancy.

What Are Crescent Solutions of Mercury Pollution 2020

The World Health Organization (WHO) and the Food and Agriculture Organization of the United Nations (FAO),

are the organisms in charge of establishing the maximum permitted limits of contaminants,

which is known as the Acceptable Daily Intake (ADI ). However, each country can establish the maximum permitted levels of contaminants in different foods.

This is also the case with mercury: in 1988 the Canadian authorities divided the ADI for this metal in food by two for children and women of childbearing age.

while almost at the same time the North American FDA divided the tolerable weekly dose by five.

What Are Crescent Solutions of Mercury Pollution 2020

Since the 1980s, the WHO has been especially concerned with the risk to children.

For the adult, it is considered that, with less than 50 micrograms per gram (µg / g) of capillary mercury (an index that reflects the concentration of mercury in the blood; easier to use,

this indicator is the one used in most studies ), there is no problem.

But the child, and even more the fetus whose nervous system is under construction,

have a sensitivity of five to ten times higher than that of the adult.

In the current state of knowledge, the WHO indicates that developmental delays may occur in the child at maternal levels of capillary mercury of 10 to 20 µg / g.

What Are Crescent Solutions of Mercury Pollution 2020

In France, a person ingests an average of 112 µg of mercury per week throughout his life.

It’s not much – a thousand times less than the amounts absorbed by Japanese victims of the catastrophic Minamata pollution during the 1950s.

and just slightly more than a third of the WHO-defined tolerable weekly dose.

According to this organism, the dose that can be consumed weekly throughout life, without negative incidence on health,

is 0.47 µg / d / Kg, considering an average body weight of 60 Kg.

In these conditions, intake of mercury should not exceed 300 µg, 200 µg of which corresponds to methylmercury.

 

Acceptable Daily Intake (ADI )

The World Health Organization (WHO) and the Food and Agriculture Organization of the United Nations (FAO).

are the organisms in charge of establishing the maximum permitted limits of contaminants, which is known as the Acceptable Daily Intake (ADI ).

However, each country can establish the maximum permitted levels of contaminants in different foods.

This is also the case with mercury: in 1988 the Canadian authorities divided the ADI for this metal in food by two for children and women of childbearing age, while almost at the same time the North American FDA divided the tolerable weekly dose by five.

the concentration of mercury in the blood

Since the 1980s, the WHO has been especially concerned with the risk to children.

For the adult, it is considered that, with less than 50 micrograms per gram (µg / g) of capillary mercury (an index that reflects the concentration of mercury in the blood.

easier to use, this indicator is the one used in most studies ), there is no problem.

But the child, and even more the fetus whose nervous system is under construction,

have a sensitivity of five to ten times higher than that of the adult.

In the current state of knowledge, the WHO indicates that developmental delays may occur in the child at maternal levels of capillary mercury of 10 to 20 µg / g.

Consumption limits

In large marine fish, the accumulation of mercury can exceed 500 times the concentration in water Internationally.

both the FDA (Food and Drug Administration of the United States) and the FSA (British Food Agency) have recommended.

limiting the consumption of tuna canned in pregnant women due to its mercury content.

and its possible preventive relationship in countries where tuna is the most consumed species (and almost only),

but not in those countries where the variety in fish consumption is much wider.

At a European level, a 1993 Commission decision sets the limit for total mercury in marketable fish at 0.5 µg / g of fresh produce, a value that is currently convincing toxicologists.

fish, mollusks, and crustaceans,-

In a total diet study carried out in Spain,

it was observed that the intake of mercury was well below the ADI for this metal and that it was the group of fish, mollusks, and crustaceans,

the main supplier of mercury to the diet, as it happens in the rest of the world. Interestingly, despite the high consumption of fish in our country, the total dietary intake of mercury was well below the ADI.

The recommended daily intake of mercury –

that is, the amount not to be exceeded – is on the order of 46 micrograms per day.

Studies carried out in our country confirm that we did not exceed these indices.

Among the autonomous communities studied, Andalusia is the one that ingests the greatest amount per person and day of this metal.

Even so, the 7.93 micrograms registered there do not reach 18% of the recommended ADIs.

The WHO-defined tolerable weekly dose

In France, a person ingests an average of 112 µg of mercury per week throughout his life. It’s not much – a thousand times less than the amounts absorbed by Japanese victims of the catastrophic Minamata pollution during the 1950s, and just slightly more than a third of the WHO-defined tolerable weekly dose. According to this organism, the dose that can be consumed weekly throughout life, without negative incidence on health, is 0.47 µg / d / Kg, considering an average body weight of 60 Kg.

MERCURY IN THE FOOD CHAIN

Its color is silvery white and it is found in native mines, but mainly in combination with sulfur. However, it is a metal that can be found everywhere: freshwater contains on average 0.1 µg / l; sea water 0.03 µg / l and air 0.005-0.06 ng / m3. The Earth’s crust contains an average of approximately 0.02 ppm of mercury and its most widespread ore is cinnabar (HgS).

solutions to mercury pollution,
solutions to mercury pollution,

It dissolves numerous metals such as gold and silver giving amalgams and is attacked by chlorine and nitric acid. World mercury production, in continuous decline since the 1970s, comes mainly from Russia, Spain, China, the United States, Mexico, and Algeria.

Mercury is used in the manufacture of batteries and pesticides, in the medicinal sector for amalgams and disinfectants, in lighting technology for electric bulbs and components, as well as in barometers and thermometers. For toxicological reasons, it has been discontinued in ointments and disinfectants.

As food chains go up, the doses measured in predators are therefore increasing.

At the earth’s surface level, the mercury that accumulates in the soil is degraded by microorganisms (biomethylation) or oxidizes to form Hg2 +.

Methylation produces methylmercury that escapes into the atmosphere and decomposes to form elemental mercury; it is washed away by rainfall.

Studies in Canada have shown that soils with high levels of mercury (presumably natural) that are flooded by water produce high rates of metal, in turn giving rise to a high accumulation of mercury in fish.

On the other hand, the accumulation of mercury in both plankton and aquatic fauna can increase up to 500 times the existing concentration in seawater.

Solid mercury as a pure metal is not toxic to humans and therefore does not pose a threat. However, mercury powders, salts, and vapors are highly toxic.

intake of copper, zinc, or lead.

In humans, the highest intake of mercury is due to food. Especially,

to the consumption of fish and its derived products due to its high retention of methylmercury.

The same is due to dental amalgams.

The accumulation of mercury is located in the liver and kidneys. However,

the effects of mercury accumulation are enhanced by the simultaneous intake of copper, zinc, or lead.

Studies carried out in various parts of the globe point to swordfish, sharks,

and fresh tunas as the most consumed species and in which a greater amount of mercury is found.

In lower concentrations, it is also found in crustaceans, salmon and farmed trout.

solutions to mercury pollution,

SPECIAL OFFER FOR WOMENS FAT LOSS

World Largest Online Earning Methods 2020

World Largest Online Earning Methods 2020

BRAND NEW 2020 MANIFESTATION MAGIC @ BIG OFFER

Leave a Reply

Your email address will not be published. Required fields are marked *