Cadmium rice

The rice with excessive cadmium content is called cadmium rice, which is mainly caused by excessive cadmium content in the soil, which causes plant absorption, and excessive use of chemical fertilizer is one of the reasons. Some cadmium content in the phosphate fertilizer and compound fertilizer exceeds the standard, which can make soil and crops not easy to absorb. Cadmium removed. Air and water cadmium pollution will also cause rice to absorb a large amount of cadmium during its survival.

Introduction

Due to the inherent toxicity of rice caused by environmental pollution, the "cadmium" component is seriously excessive, and it is referred to as "cadmium rice."

China has a large population of rice, and the trend of grain circulation may lead to an increase in the number of people who consume excessive amounts of cadmium. Existing research reveals the current status of cadmium pollution, but in clinical work, the confirmed cases of chronic cadmium poisoning caused by environmental pollution are still mostly cases. China's food cadmium limit health standards, rice cadmium content ≤ 0.2 mg / kg, flour cadmium content ≤ 0.1 mg / kg, meat fish cadmium content ≤ 0.1 mg / kg, egg cadmium content ≤ 0.05 mg / kg, etc., due to health The formulation of standards requires consideration of safety factors and the body's intrinsic metabolic capacity, so short-term intake of cadmium in excess of food does not mean that the injury will immediately appear.

Environmental cadmium pollution has significant regional characteristics. Urban residents have diversified sources of consumer rice, and the city’s food safety monitoring system is relatively complete. Therefore, people who face significant cadmium pollution threats are the groups that produce and consume themselves in the polluted areas.

harm

Cadmium and its compounds can enter the body through the respiratory and digestive tracts. Long-term exposure to a certain dose of cadmium mainly leads to kidney damage, manifested as urine contains a large number of low-molecular-weight proteins, due to impaired renal tubular function, resulting in calcium, phosphorus and vitamin D metabolism disorders, resulting in osteomalacia and osteoporosis, severe and easy Pathological fractures have severely affected the patient's ability to work and quality of life. Related epidemiological studies also suggest that patients with chronic cadmium poisoning may suffer damage to the nervous system, immune system, reproductive system, and high incidence of tumors.

Super rice: more severe cadmium pollution

Even if there is excessive cadmium in the market, the degree of exceeding the standard is not the same. Prof. Pan’s team once conducted an experiment in the school and found that the risk of excessive cadmium in hybrid rice and super rice is more serious than that of ordinary rice.

Experts collected black soil that can represent the neutral rice planted in southern China, an acid paddy soil with red paddy soil, and deliberately added cadmium in some soils. The experts found that in the soil without cadmium, Super rice has a 2.4-fold higher affinity for cadmium than conventional rice, and the cadmium content in grains is more than double that of ordinary hybrid rice. In the soils with cadmium added, the cadmium content in the grain of both soils increased significantly, and in the slashed soil, they were 5-6 times that of the soil without cadmium. In the acid red soil, cadmium was not added. 7-8 times of the soil.

The reason why super-rice is more severe than cadmium pollution is because its root system is well developed and it has a clear absorption tendency for cadmium in soil.

Solve the problem of super-rice's absorption of various cadmium in the soil due to multiple hybrids of super rice, which has superior genes, which makes super-rice's absorption of cadmium pollution more serious. Currently, there is no way to solve this problem. To overcome this problem, from the perspective of ensuring food production, super rice is an inevitable choice for rice cultivation.

At present, there is an urgent need to strengthen the screening and breeding of hybrid rice; to develop ways to control cadmium in acidic soils; and to arrange a reasonable soil layout according to crop varieties in production; in particular, varieties with strong cadmium absorption should not be as acidic or red earth as possible. Planting in rice.

Diet advice

Excessive cadmium pollution will cause harm to human bones and kidneys. It will cause "bone pain" and cause kidneys to fail to work properly. Moreover, excessive intake of cadmium will also cause "deterrent effects" and impede human body absorption. Indispensable trace element - absorption of zinc.

In China, about 10% of the commercially-available rice in the spot check exceeds the cadmium standard, but ordinary citizens do not need to worry too much. As long as the rice is eaten scientifically, the rice that we sell on the market is still safe, and we can reasonably avoid the risk of eating caused by excess cadmium. . Even if 10% of the cadmium pollution in the sale of rice exceeds the standard, it is still insignificant. Short-term consumption does not pose any risk to the body. The market for rice is still generally safe.

The risk of eating refers to those single rice varieties that have a very simple diet, eat a lot, eat less, eat less protein, and eat only a certain area for a long period of time. If this type of rice is exactly the same as “cadmium exceeded” In rice varieties, there is a risk of harming human health, and this risk is generally even greater for farmers who grow rice on land that is “self-eating” and cadmium-contaminated.

Our common people, although unable to identify from the naked eye what kind of rice cadmium pollution exceeded, but as long as the purchase of rice, more choice of different origin, different brands of rice varieties, while widely ingest other nutrients, mixed to take Food, eat more seafood, beans and other products with higher zinc, can reduce the risk of illness, while southerners should be more to eat northern varieties.

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