Ding Maobai, a researcher at the China Center for Disease Control and Prevention Center for Poisoning Control, has not received any attention because of the undue cadmium overwhelming rice in the previous section. A recent report about the gradual spread of heavy metal-contaminated land surrounding the main production areas of Yungui Xiangguichuan and other heavy metal mines has caused everyone to Panic. Soil pollution incidents have occurred in China in recent years. What are the adverse effects of soil heavy metal pollution? Please see -

Major soil pollution incidents have occurred frequently In recent years, arsenic and cadmium have been prominent in major heavy metal-contaminated soil incidents. Among them, the arsenic pollution incident at the Pearl River Yangzonghai Plateau at the junction of Kunming City and Yuxi City has the largest response: 2008, Yunnan The illegal discharge of a chemical plant actually turned the pearl of the plateau into a poisonous lake. The arsenic content in Yangzonghai is 0.16mg/liter (the standard for arsenic in drinking water is 0.05mg/liter), which is equivalent to nearly 70 tons of high-purity arsenic entering the water body. The cost of governance is as high as billions of dollars, harming or delaying for several years. In 2009, Chengcheng Company located in Minquan County, in the upper reaches of the Dasha River, used inferior quality ore to produce sulfuric acid. A large amount of arsenic was directly discharged into the Dasha River with wastewater, causing the concentration of arsenic in the river water to exceed 899 times.

In recent years, cadmium pollution incidents have also occurred frequently. For example, in Xinma Village of Majiahe Town, Zhuzhou City, Hunan Province, cadmium pollution incidents that plagued the country in January 2006 have caused health hazards to nearby villagers. There was also an excessive discharge of cadmium from a factory in Zhentou Town, Liuyang City, Hunan Province, which caused environmental pollution; the sewage treatment at Shaoguan smelter during the inspection period shortened the construction period and severely exceeded the discharge of cadmium-containing slag.

The lesson of health damages The painful soil heavy metal pollution is caused by excessive heavy metal content in the soil caused by excessive deposition of heavy metals in the waste. The main sources of pollution are tailings from mining, slag discharge from smelting plants, degradation of arsenic-containing pesticides, discharge of metal-containing wastewater from industrial manufacturing plants, hundreds of millions of discarded batteries, and atmospheric deposition. Pollution patterns are often associated with wastewater discharge. The heavy metals contaminated by the soil mainly include elements with strong biological toxicity such as mercury, cadmium, lead, chromium, and metalloid arsenic. Heavy metal pollution is characterized by a wide range of pollution, long duration, and high pollution concealment, and most of them cannot be biodegraded and remain for a long time. Some can be absorbed and transformed by plants, but can cause plant physiological dysfunction, malnutrition; some can be enriched in crop seeds, and even can be transformed into more toxic methyl compounds. Most of the heavy metals that contaminate the soil will further contaminate the water source, which is the main way to cause health hazards.

The painful disease caused by cadmium poisoning in Japan in the 1950s has been recorded as a typical example of environmental pollution in historical archives. The disease was first popular in the Shentongchuan watershed in Toyama Prefecture, Japan. The survey found that waste water containing cadmium discharged from a lead-zinc mine in the upper reaches of the river had polluted the downstream soil and water sources. Residents were sick due to prolonged exposure to contaminated cadmium, which caused bone deformation due to osteoporosis. The patient is susceptible to multiple pathological fractures under mild trauma. The major lesions are osteomalacia and renal tubular lesions. The basic pathophysiology is due to tubular damage and loss of calcium. Pregnancy, breast-feeding, calcium deficiency and prone to inducement. The late stage of patient disuse atrophy due to skeletal deformation, long-term bedridden, and physical weakness, often due to secondary infection.

Arsenic pollution can cause skin cancer and lung cancer Arsenic is an ancient poison. A variety of inorganic arsenic 100mg can cause poisoning. It can form a stable complex with the sulfhydryl group of the enzyme, enter into all tissues in the human body, and is concentrated in the hair, skin, and nails with more keratin protein. Arsenic can affect the fetus through the placenta, with a half-life in blood of 60 hours. After arsenic contaminates the soil, it can cause long-term chronic exposure and poisoning. In addition to headaches, dizziness and other symptoms, the poisoned person has prominent skin damage, manifested as skin pigmentation, hyperkeratosis, verrucous hyperplasia and skin cancer, and may also have gastrointestinal dysfunction, hepatomegaly, and numbness of limbs. Symptoms, severe liver function has significant damage. Recent surveys have confirmed that long-term exposure to arsenic can cause lung cancer.

Cadmium pollution easily leads to kidney damage. Cadmium is a silver-white, shiny metal that is mostly present in the form of compounds such as cadmium oxide and cadmium chloride. Cadmium is mainly used for electroplating of steel, iron, copper, brass and other metals, and is also used extensively for the production of pigments and phosphors. Cadmium can also be used to make small and large-capacity batteries. The toxicity of cadmium is greater, and the air and food contaminated by cadmium are harmful to the human body.

Long-term exposure to cadmium and its compounds can cause kidney damage, the main manifestations of patients with large amounts of low-molecular-weight protein in the urine, decreased tubular absorption, increased urinary cadmium discharge. Severe cases can also cause muscle atrophy, joint deformation, unbearable bone pain, pathological fractures, and even death.