Is copper patina poisonous?

Verdigris is poisonous, so when you come into contact with or use verdigris, you must have a more comprehensive and scientific understanding of some common sense about it. If you consume excessive amounts of verdigris every day, you may experience diarrhea, fatigue, etc., especially small babies are more prone to verdigris poisoning, so parents should have a more scientific understanding of these characteristics of verdigris.

Verdigris (also known as copper rust) is alkaline copper carbonate. The chemical formula of verdigris is CuCO3?Cu(OH)2. It is light green fine particles or amorphous powder, which is the main component of copper rust formed by copper in the air. Verdigris is toxic and unstable, and decomposes at 473K (200℃).

Is Verdigris Toxic?

When copper pipes are corroded, they will produce excessive verdigris. The copper content in the first water sample every morning far exceeds the human drinking water standard, and some reach more than 10 mg. People call this phenomenon "green water" or "blue water". For human health, the copper content in drinking water should be lower than 2 mg/L. If it is higher than 3 mg/L, the water will have an unpleasant odor. Daily intake of copper exceeding the standard will lead to vomiting, diarrhea, fatigue, cirrhosis, etc. Infants under 12 months old are extremely susceptible to poisoning. Since the mechanism of blue water generation is relatively complex, it is impossible to completely solve the blue water problem of copper pipes. Measures to be taken: When the water pipe has been stationary for more than 4 hours, drain about 10L of water before use.

Copper material is relatively soft and will corrode severely when the water flow rate is large, greater than 2 meters per second. The main factor of corrosion is excessive water flow. The greater the water flow, the more likely it is to cause corrosion, and copper pipes that are used for a long time will inevitably produce verdigris.

The main components of verdigris are copper sulfate and copper carbonate, and it is green in color. Verdigris is toxic, easily weathered, and easily soluble in water. It has antifungal effect but poor antibacterial effect and can be used as an insecticide. Copper ions Gu+2 can coagulate proteins - the principle of insecticides (also the principle of killing people),

The above is some common knowledge about verdigris. Through these people, we know how unstable verdigris is. It is highly soluble in water, but it can inhibit bacteria and is often used as an insecticide. However, because it is a toxic substance, human body contact or medication must be cautious and used under the guidance of professionals.