The impact of metals on food quality and safety

The effects of heavy metal contamination on food quality and safety are:

Mercury: It sinks directly into the liver after ingestion, and is extremely damaging to the brain's visual nerves. Natural water, which contains milligrams per liter of water, can be highly toxic. Drinking water containing trace amounts of mercury can cause cumulative poisoning when consumed for a long time.

Chromium: It can cause numbness of the limbs and mental abnormalities.

Arsenic: can cause hyperpigmentation and lead to abnormal keratinization.

Cadmium: causes high blood pressure, causes cardiovascular and cerebrovascular diseases; Destroys bone calcium, causing kidney dysfunction.

Lead: It is one of the most toxic heavy metal pollutions, and it is difficult to eliminate it once it enters the human body. Direct damage to human brain cells, especially the fetal neurosperm plate, can cause congenital cerebral sulcus shallow and mental retardation; It causes dementia and brain death in the elderly.

Cobalt: It can cause radiation damage to **.

Vanadium: hurts people's hearts and lungs, and causes abnormal cholesterol metabolism.

Antimony: and arsenic can make silver hand ornaments brick red, and have radioactive damage to **.

Thallium: It can cause more and more neurosis in people.

Manganese: When excessive, it can cause hyperthyroidism.

Tin: and lead are important components in the ancient giant poison 'plover', which solidified into a lump after entering the abdomen and fell to death.

Zinc: Zinc fever can occur in excess.

Iron: It has a catalytic effect on oxidation in the human body, but when there is too much iron, it can damage the basic components of cells, such as lipacenic acid, proteins, nucleic acids, etc.; This leads to an imbalance of other trace elements, especially calcium and magnesium requirements.

Any one of these heavy metals can cause headaches, dizziness, insomnia, forgetfulness, confusion, joint pain, stones, cancer (such as liver cancer, stomach cancer, bowel cancer, bladder cancer, breast cancer, prostate cancer, blackfoot disease and deformities). In particular, it is serious to destroy the cells, organs, bones, and spirits of the digestive system and urinary system.

1. Lead is widely distributed in nature and is an important raw material in industrial production. Lead is also widely used in life, such as colored glazed ceramics, books printed with color pictures, plastic products, enamel, tinplate food solder, gasoline antiknock agent and so on contain lead. The route by which lead and its compounds invade the human body, mainly the respiratory tract, followed by the digestive tract, cannot be absorbed by the intact **;

2. Arsenic is widely distributed in nature, and trace amounts of arsenic are contained in animal and plant organisms. Farmland water pollution and the widespread use of arsenic-containing pesticides are the main causes of crop pollution. Arsenic was detected in vegetables in most parts of China with a detection rate of nearly 100%.

Grains, fruits, vegetables, meat, milk, eggs, fish and their products, tea and other foods have been detected, and some exceed food safety and hygiene standards;

3. Mercury is very easy to be polluted by pollutants in the environment through various ways, which directly affects people's dietary safety and endangers human health. Since the use of mercury-containing acaricides in agriculture in the late fifties of the last century, mercury has become increasingly polluting the soil, natural water system and atmosphere. Mercury-containing wastewater discharged from factories is a major source of water pollution.

China's sanitary standards for drinking water quality stipulate that mercury does not exceed.

Legal basisArticle 2 of the Food Safety Law of the People's Republic of China.

Those who engage in the following activities within the territory of the People's Republic of China shall comply with this Law:

1) Food production and processing (hereinafter referred to as food production), food sales and catering services (hereinafter referred to as food business);

2) production and operation of food additives;

3) The production and operation of packaging materials, containers, detergents, disinfectants and tools and equipment used for food production and operation (hereinafter referred to as food-related products);

4) The use of food additives and food-related products by food producers and traders; Shed coarse.

5) storage and transportation of food;

6) Safety management of food, food additives, and food collapse related products.

Heavy metals usually refer to metals with a specific gravity greater than 5. Changchun** pointed out that heavy metals in the daily environment mainly come from the mining and smelting industries, and are mainly released into the daily environment through the discharge of "three wastes". For example, industrial wastewater, which accounts for 60%-80% of the total amount of wastewater, has complex compositions and contains heavy metals that are difficult to biodegrade to varying degrees.

Heavy metals in food are harmful to the human bodyThe effects of heavy metals on the human body are slow and long-term, and once they enter the body, they are very difficult to metabolize. Taking lead as an example, Xinhuanet pointed out that lead has accumulation in living organisms, and long-term low-concentration exposure to lead can affect the development of cardiovascular, central nervous system and other systems, and fetuses and infants are especially sensitive to lead. Long-term intake of foods with excessive lead content will affect the nervous system and intellectual development, and endanger human health.

How to prevent excessive heavy metals? Experts recommend not eating food produced in one place for a long time to reduce the risk of excessive heavy metals. At the same time, it is also necessary to actively control soil heavy metal pollution, improve legislation, strengthen research, and develop related industries.

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Heavy metals in various chemical states or chemical forms will retain, accumulate and migrate after entering the environment or ecosystem, causing harm. For example, the heavy metals discharged with wastewater, even if the concentration is small, can accumulate in algae and sediment, and be adsorbed by the body surface of fish and shellfish, resulting in food chain concentration, thus causing public pollution.

For example, Minamata disease in Japan is caused by the presence of mercury in the wastewater discharged by the caustic soda manufacturing industry, which is turned into organic mercury by biological action; Another example is the pain disease, which is caused by cadmium emitted by the zinc smelting industry and the cadmium electroplating industry. The lead emitted by automobile exhaust enters the environment through atmospheric diffusion and other processes, resulting in a significant increase in the concentration of lead on the surface at present, resulting in an increase of about 100 times in the absorption of lead in modern humans compared with primitive humans, which damages human health. Heavy metals are extremely harmful to the human body.

Common mercury: Mercury sinks directly into the liver after ingestion, which is extremely damaging to the brain, nerves, and vision. Natural water contains milligrams per liter of water, which can cause poisoning in people.

Cadmium: causes high blood pressure, causes cardiovascular and cerebrovascular diseases; Destroys bones, liver and kidneys, and causes kidney failure.

Lead: It is one of the most toxic heavy metal pollutions, and it will be difficult to eliminate once it enters the human body. It can directly harm human brain cells, especially the nervous system of the fetus, and can cause congenital mental retardation.

Cobalt: It can cause radiation damage to **.

Vanadium: hurts people's hearts and lungs, and causes abnormal cholesterol metabolism.

Antimony: and arsenic can make silver hand ornaments brick red, and have radioactive damage to **.

Thallium: can cause polyneuritis in people.

Manganese: When excessive, it can cause hyperthyroidism. It can also harm vital organs.

Arsenic: It is one of the components of arsenic, which is highly toxic and can cause rapid death. Long-term exposure to small amounts can lead to chronic poisoning. In addition, there is carcinogenicity.

Any of these heavy metals can cause headaches, dizziness, insomnia, forgetfulness, confusion, joint pain, stones, and cancer.