Cadmium is not as well known as mercury or lead . Cadmium is an element harmful to the human body. It is mostly in a chemical state in the natural state. The content is very low. The cadmium content in the atmosphere is generally not more than 0.003 μg/m3, and the water is not more than 10 μg/L, not more than 0.5 per kg of soil. Mg. Such low concentrations will not affect human health. Cadmium is often associated with zinc , lead and the like. According to environmental experts, cadmium is widely present in the environment from heaven to earth. After the environment is contaminated with cadmium, cadmium can be enriched in the living body, enriched in other organisms through the food chain, and then enters the human body through food, water, smoking or other means. When the concentration of cadmium reaches a certain level, it will occur. Cadmium poisoning. At the same time, cadmium is a kind of benefit humanity heavy metal, widely used in electroplating industry, chemical industry, electronics industry and the nuclear industry and other fields.
Since the discovery of cadmium in the early 20th century, the production of cadmium has increased year by year. Cadmium is widely used in the electroplating industry, chemical industry, electronics industry and nuclear industry. Cadmium is a by-product of the zinc smelting industry and is mainly used in batteries, dyes or plastic stabilizers, which are more easily adsorbed by crops than other heavy metals. A considerable amount of cadmium is discharged into the environment through waste gas, waste water, and waste residue, causing pollution. The main sources of pollution are lead-zinc ore, as well as non-ferrous metal smelting, electroplating and cadmium compounds as raw materials or catalysts.
The pollution of cadmium to the soil mainly includes gas and water. Gas-type pollution is mainly caused by the diffusion and natural sedimentation of cadmium-containing industrial waste gas, which is accumulated in the soil around the plant, and the cadmium concentration in the soil can reach 40 ppm. The pollution range can reach several kilometers. Water pollution is mainly caused by the ore dressing wastewater of lead-zinc ore and related industries (electroplating, alkaline batteries, etc.) discharged into surface water or infiltrated into groundwater.
The pollution of cadmium in water mainly comes from surface runoff and industrial wastewater. Sulfuric Acid pyrite and waste discharge when taken phosphate manufactured by the phosphate rock containing high cadmium per liter of waste water containing up to tens to several hundreds of micrograms of cadmium, lead and zinc in the atmosphere and non-ferrous metallurgy, combustion Cadmium particles formed by incineration of plastic products may enter the water; cadmium emitted from catalysts, pigments, plastic stabilizers, synthetic rubber vulcanizing agents, fungicides, etc., which are used as raw materials, may also cause pollution to water bodies. The cadmium content in drinking water is often increased due to contamination of containers and pipes.
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