We know that many heavy metals are essential elements of the human body, but cadmium (Cd) described in this chapter, it is not an essential element in the human body, often exists in nature as a compound, the general content is very low, so in the normal environmental state will not affect human health. It is often associated with zinc and lead.
Of course, the above is said in the normal environmental state, but the environment is polluted by cadmium (has been polluted, visible cadmium content is not low), then it is different. Cadmium can be enriched in living organisms, through the food chain to the human body, resulting in chronic poisoning! Cadmium is found in soil, atmosphere and water. It is mainly absorbed through the respiratory tract and digestive tract, and skin absorption is also present, but relatively small.
Speaking of which, Hangzhou Modi, as an online water quality monitor manufacturer, takes this opportunity to understand the knowledge about cadmium pollution in water with you!
Sources of Cadmium Pollution in Water Bodies?
Cadmium in water The main sources of cadmium pollution are surface runoff and industrial wastewater. The cadmium content is relatively high in the wastewater discharged from pyrite to make sulfuric acid and phosphate rock to make phosphate fertilizer, and the amount of cadmium in each liter of wastewater can reach tens or hundreds of micrograms. In addition, cadmium particles formed by lead and zinc mines in the atmosphere and non-ferrous metal smelting, combustion, and incineration of plastic products may enter the water body. There are also some synthetic rubber vulcanization agents, fungicides and other emissions of cadmium will also cause pollution to the water body. In the process of urban water use, the cadmium content in drinking water will also increase due to the pollution of containers and pipes. The discharge of industrial wastewater can result in much higher cadmium content in offshore water and plankton than in the open sea, and the cadmium content in surface water in industrial areas is also higher than in non-industrial areas.
What are the Consequences of the Use of Cadmium-contaminated Water?
Since we all know that cadmium can cause water pollution, we should not directly use cadmium-contaminated water sources. Why is that? Because it is harmful to the human body!
Long-term drinking of cadmium-contaminated water sources is likely to lead to “pain pain disease”. The accumulation of excessive cadmium in the body impels the function of the kidney tubules, causing the loss of tene proteins from the urine, and over time, the formation of chondrosis and spontaneous fractures, which are the causes of chronic cadmium poisoning. Not only that, it also has an impact on human fertility, it can seriously damage the Y factor, so that more babies are born female. It can also cause anemia!
In the case of chronic cadmium poisoning mentioned above, there is also acute cadmium poisoning, which is caused by one-time inhalation or ingestion of large amounts of cadmium compounds in the production environment. Cadmium is present in large quantities and is a strong local irritant. If it enters the body through the respiratory tract and causes respiratory irritation symptoms, it is likely to develop pneumonia, pulmonary edema, and dyspnea. However, if it enters the human body from the digestive tract, there will be symptoms such as vomiting and abdominal pain, and serious cases will lead to liver and kidney syndrome death.
How to Avoid Using Cadmium-contaminated Water?
Environmental protection is a must! In addition, water quality monitors are installed at major sewage discharge outlets to monitor water quality changes in real time! To determine whether the pollutants in the water exceed the standard. As for monitoring the content of cadmium in water, a T8000-Cd total cadmium online analyzer produced by Hangzhou Modi-Tech is used to detect the content of cadmium in water. Colorimetric determination of dithizone by acid oxidation. The pre-treated water sample was injected into the digestion reaction tank through an injection pump. The water sample was first reacted with an acidic oxidizer, and then all forms of cadmium in the water sample were uniformly oxidized to cadmium divalent, and then the pH of the solution was adjusted to make it strong alkaline, and then the characteristic color developing agent was added for extraction color developing reaction. Within its measuring range, the degree of color change of the aqueous solution is proportional to the concentration of cadmium in the water sample, and by measuring the color change, the content of cadmium in the water sample can be calculated.
