Cadmium is a toxic element and its compounds are more toxic. It was meant to be a compound that didn't interact with human life, but the industrial revolution unleashed that demon. Some foreign studies have estimated that 22,000 tons of cadmium enters the soil every year. Cadmium compounds have different toxicity in nature. Cadmium sulphide and cadmium selenesulfonic acid were less toxic, cadmium oxide, cadmium chloride and cadmium sulfate were more toxic. The average dose of cadmium poisoning is 100mg. Acute poisoning symptoms are mainly manifested as nausea, salivation, vomiting, abdominal pain, diarrhea, followed by central nervous poisoning symptoms. In severe cases, death may result from prostration.
Simultaneously Cadmium is not an essential element for human body, and it is an environmental pollutant. In general, excessive intake of cadmium can lead to cadmium poisoning. The world health organization (who) lists cadmium as a major food pollutant; Cadmium is classified as a human carcinogen by the international agency for research on cancer (IARC) and can cause serious health damage to humans. The us registry of poisons and diseases (ATSDR) lists cadmium as the seventh most hazardous substance to human health. China has also listed cadmium as one of the key monitoring indicators for the implementation of total emission control.
Long-term intake of food containing cadmium can cause chronic poisoning of the kidneys, mainly damaging the renal tubules and glomeruli, resulting in proteinuria, amino acid urine and diabetes. At the same time, as cadmium ions replace calcium ions in bone, calcium deposition on bone is impeded, and bone collagen is also prevented from curing and maturation, leading to rickets.
The prevention and treatment of cadmium in the environment: cadmium is one of the main toxic substances in environmental pollution, and once cadmium is polluted in the environment, it is difficult to eliminate it. Cadmium contaminated soil can be treated with soil improvement measures, such as adding lime to the soil to increase the pH value of the soil; Phosphate fertilizers are used to form cadmium phosphate deposits, thereby reducing the uptake of cadmium by plants. Activated carbon, montmorillonite, kaolin, bentonite, weathered coal, sulfonated coal, high temperature slag and zeolite, chitosan and carboxymethyl chitosan, diatomite, improved fiber, eggshell, active humus oxide, nano materials such as adsorbent due to its surface area is large, complex structure and other properties, can have very good adsorption of cadmium in soil and water. For animals fed with a high content of cadmium, antagonistic elements with cadmium such as zinc, iron, copper, calcium, selenium and vitamin C can be added to reduce the toxicity of cadmium to animals.