Question 1: What is the cause of excessive lead? 1. In the atmosphere. It mainly refers to lead emissions from industrial production, life and transportation. The discharge of lead poison comes from unavoidable industrial waste gas. Leaded gasoline, automobile exhaust, coal burning, iron and steel metallurgy, chemical factory emissions. 2. In soil and dust. Under normal circumstances, soil lead contains 10~50mg/kg, but in urban areas, the lead content in soil may be high. It is hundreds or even thousands of times higher. Indoor lead dust is also one of the important sources of children's lead exposure. 3. Water. Wastewater contamination of drinking water bodies can cause the lead content in the water to increase. Although the lead content in tap water is not high, it is The bioavailability of lead is often higher than that in food. 4. Lead is found in daily necessities and decorative materials. Home decoration materials (paints, coatings), cigarette smoke, cosmetics (lipstick, talcum powder), lead-containing containers, metal tableware, etc. Pollution is also one of the main reasons for current lead exposure.

Since the absorption pathway of lead in the body can compete with calcium, iron, zinc, and selenium, the diet is rich in calcium, iron, zinc, and selenium. , can reduce the absorption of lead. Especially milk, the protein contained in it can combine with lead in the body to form an insoluble compound, thereby greatly reducing the body's absorption of lead. In addition, vitamin C can form a relatively soluble form with lead in the intestines. Low ascorbate lead salts are excreted with feces to reduce the absorption of lead in the intestines. Therefore, eating more vegetables and fruits rich in vitamin C can also help to excrete lead from the body. Especially recommended, mung bean stew every week Drink it four times and clear it in three months. It will relieve the heat and eliminate lead. I hope it will be helpful to you!

Question 2: What is the cause of excessive lead in children? High-quality answer report

The following are the reasons for excessive lead in children

1. Widespread use of leaded gasoline: Due to various reasons, unleaded gasoline has not been widely used in our country, but the number of cars is increasing at an extremely fast rate.

2 Industrial pollution: Lead is widely used in battery manufacturing, metal smelting, printing and other industries. Industrial lead pollution in my country is very serious.

3. Contamination of the home environment by lead workers: Workers do not pay attention to health and safety and bring home lead from the workplace to pollute the home environment.

4. Contamination of school supplies and toys: So far, lead is still widely used in the production of paint. Among school supplies, the paint layer on desks, textbook covers and color pages, and dark pencil paint layers have the highest soluble lead content. Since young children often have the habit of sucking their fingers and chewing toys, the absorption rate of soluble lead contained in toys and school supplies is very high in gastric juice.

5 Food contamination: Children have a higher absorption rate of lead than adults, about 50%. Therefore, children should be discouraged from eating certain foods with higher lead content.

For example: Popcorn: The furnace and lid of traditional popcorn machines are made of leaded pig iron. The melting point and boiling point of lead are relatively low, so it is highly volatile when heated in a closed manner. and mixed into popcorn.

Preserved eggs (preserved eggs): In the traditional production process, lead oxide is added as a food additive to speed up their ripening. Therefore, the lead content of preserved eggs is also higher.

Fruit skin: Lead arsenate is widely used as a pesticide in fruit gardens, so the lead content in the fruit skin is also very high. It should be thoroughly cleaned or peeled before eating, which can greatly reduce lead. intake.

So how to remove lead?

Children must have lead evacuation if their lead content exceeds the standard. There are many ways to remove lead, but the safest for children is nutrient intervention. The only "Yitong Growth Lead Exclusion Oral Liquid" approved by the Ministry of Health of the State Food and Drug Administration with the function of "promoting lead excretion + enhancing immunity" is available. As a prevention, dietary therapy can block the absorption of some external lead and partially excrete lead in the blood. At ordinary times, you should pay attention to your diet, drink more milk and less drinks; eat more fish, shrimp, lean meat, soy products, eggs and shellfish, eat less preserved eggs, fried and puffed foods; eat more fruits and vegetables, such as kelp, Onions, garlic, carrots, tomatoes, kiwi and sea buckthorn, etc.

Question 3: What are the common reasons that lead to excessive lead in babies? If the baby smells car exhaust and eats too much popcorn and preserved eggs, it will lead to excessive lead. It is best to eliminate lead through dietary therapy, such as vitamin C, pectin, yogurt, protein foods, animal blood, garlic, kiwi, carrots, etc., which can eliminate lead.

Question 4: What habits can lead to high lead content? There are many factors that can lead to excessive lead levels in adults, including eating habits, tableware, cosmetics, furniture, etc., which may cause excessive accumulation in the human body. of lead. Lead poisoning may have no symptoms in the early stage, but it will affect the digestive system, nervous system, blood system, urinary system, etc., and in severe cases, it may be life-threatening. Liu Siren said that if you find that you have excess lead in your body, it is best to go to the hospital in time and follow the doctor's guidance and pay more attention in your life. The excess lead in the body can be excreted from the body. ■There are many causes of lead poisoning. Dr. Liu Siren said that there are many causes of lead poisoning, including eating lead-containing foods, such as preserved eggs, popcorn, canned foods with lead solder, fruit peels, etc.; frequent contact with color-printed food packaging, paint-based items, and other products containing lead. Lead cosmetics, hair dyes, lead-contaminated clothing, car exhaust, lead-containing drugs; lighting candles containing lead, especially scented and slow-burning candles. For adults who have little contact with lead, the use of unqualified glazed tableware may be an important reason for excessive lead levels in the body. According to reports, heavy metals such as lead and cadmium in unqualified porcelain can easily dissolve from the beautiful glaze, causing chronic harm to human health. Ceramic foodware is usually glazed to decorate its surface, which contains heavy metals such as lead and cadmium. When exposed to acidic food, excessive amounts of lead and cadmium will dissolve into the food in poor-quality products. If people eat food containing products with high lead and cadmium content for a long time, lead will be deposited in the blood, causing damage to the central nervous system of the brain, kidneys and other organs. In-glaze and underglaze ceramics with smooth surfaces like glass have very little or no leaching of lead and cadmium, so you can buy them with confidence; while overglaze ceramics with uneven surfaces should try to choose products with fewer surface decorations. For products that you are not sure about, you can soak them in vinegar for a few hours. If you find that the color has changed significantly, you should discard them. ■Lead poisoning can be life-threatening. Dr. Liu Siren said that lead and its compounds are toxic to a certain extent. After entering the body, they will cause harm to multiple systems such as nerves, hematopoiesis, digestion, kidneys, cardiovascular and endocrine systems. Most common lead poisoning at present is mild chronic lead poisoning. The main pathology is the impact of lead on metal ions and enzyme systems in the body, causing autonomic nerve dysfunction, anemia, low immunity, etc. Lead poisoning can affect many organs of the human body, and its symptoms include nausea, vomiting, loss of appetite, abdominal distension, constipation, bloody stools, abdominal cramps, dizziness, irritability, insomnia, drowsiness, irritability, pale complexion, palpitations, shortness of breath, Low back pain, edema, proteinuria, hematuria, cast urine, and in severe cases, renal failure. If pregnant women are accidentally exposed to lead poisoning during pregnancy, it can also cause miscarriage, stillbirth or deformed babies. ■Prevent lead poisoning in many aspects. To prevent lead poisoning, we should start from many aspects such as diet and living habits. First of all, in terms of diet, newspapers and other printed matter cannot be used as food packaging. When using food bags to hold food, you should avoid direct contact with the food, especially acidic food; vegetables and fruits should be washed before eating. Peel the skin as much as possible to prevent lead content in pesticides from remaining. In terms of living, try not to use lead-based paint to decorate the walls, floors and furniture of your home. Otherwise, once the paint chips peel off, the lead in the paint can easily cause lead pollution in the home. Try to use lead-free cosmetics, hair dyes, etc. In addition, don't walk near roads with frequent car traffic, because there is a lot of lead in car exhaust and the soil around the roads. The diet should contain a sufficient amount of high-quality protein, such as eggs, lean meat, poultry, fish and shrimp, soybeans and soy products, which should account for more than 1/2. When preparing meals, you should choose foods rich in vitamins, especially vitamin C.

Question 5: What causes heavy metals to exceed the standard? Heavy metals that exist in various chemical states or chemical forms will persist, accumulate and migrate after entering the environment or ecosystem, causing harm. For example, heavy metals discharged with wastewater, even if the concentration is small, can accumulate in algae and sediment, and be adsorbed by the surface of fish and shellfish, causing concentration in the food chain, thus causing public nuisance. For example, Minamata disease in Japan is caused by mercury contained in wastewater discharged from the caustic soda manufacturing industry, which is transformed into organic mercury through biological processes; and Itai-itai disease is caused by cadmium discharged by the zinc smelting industry and the cadmium electroplating industry. To. Lead emitted from automobile exhaust enters the environment through atmospheric diffusion and other processes, resulting in a significant increase in the concentration of lead on the surface. As a result, the amount of lead absorbed in the human body in modern times has increased by about 100 times compared with primitive people, damaging human health. Heavy metals are extremely harmful to the human body. Common ones include:

Children harmed by heavy metal pollution

Mercury: After ingestion, it sinks directly into the liver, causing great damage to the brain, nerves, and vision. Natural water contains 0.01 mg per liter of water, which can cause poisoning.

Cadmium: Causes high blood pressure, causes cardiovascular and cerebrovascular diseases; destroys bones, liver and kidneys, and causes renal failure.

Lead: It is the most toxic type of heavy metal pollution. Once it enters the human body, it will be difficult to eliminate. It can directly damage human brain cells, especially the fetal nervous system, and can cause congenital mental retardation.

Cobalt: Can cause radioactive damage to the skin.

Vanadium: Harms the heart and lungs, causing abnormal cholesterol metabolism.

Antimony: Together with arsenic, it can turn silver jewelry into brick red and cause radioactive damage to the skin.

Thallium: can cause polyneuritis in people.

Manganese: excessive amounts can cause hyperthyroidism. It can also damage vital organs.

Arsenic: It is one of the components of arsenic. It is highly toxic and can cause rapid death. Long-term exposure to small amounts can lead to chronic poisoning. It is also carcinogenic.

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

In recent years, heavy metal pollution incidents have become commonplace, ranging from the incident of excessive lead in the blood of children in Hunan, hundreds of children in Fengxiang, Shaanxi with excessive lead, to heavy metal contamination of "vegetable baskets", etc. Recently, Southern Weekend reported that the water dispenser contained Heavy metal pollution also exists, which shows that heavy metal pollution has affected our living environment. Our common plastic doors and windows are also contaminated by heavy metal lead. Plastic doors and windows are PVC special-shaped materials. The heat stabilizer system for PVC special-shaped materials mainly includes lead salt, organic tin, calcium zinc and their composite stabilizers. Due to its good stabilizing effect, lead salt stabilizer has become the most commonly used stabilizer in the production of plastic doors and windows in China. However, due to the toxicity of lead, although it does not come into direct contact with the human body, it still poses a threat to the environment and human health. Lead stabilizers are not allowed in rigid PVC doors and windows in North America. Health Canada Document 1996-48, U.S. Consumer Product Safety Commission Document 96-150 and Document No. 4426 all clearly stipulate this. However, the pollution problem of lead salt stabilizers has not yet been taken seriously in China.