1. The harmfulness of lead Lead poison obviously affects the human body and intelligence. It is more obvious to children and pregnant women. Due to the physiological characteristics of growth and development, pregnant women with severe lead poisoning will have premature birth and miscarriage. Lead poisoning can affect the growth and mental development of infants and young children, and severe cases can cause dementia. We only need to reduce the lead content in drinking water to ensure people's intake of lead. 2, the role of copper. Copper is an indispensable trace element in the human body. It is an important component of proteins and enzymes in the body. It acts on the metabolic processes of the body and promotes many functions of the human body. Copper also inhibits bacterial growth and keeps drinking water clean and hygienic. More than 99% of the bacteria in the water disappeared after entering the copper pipeline for five hours. Copper is impervious, and its harmful properties such as grease, bacteria, viruses, oxygen and ultraviolet rays cannot pass through it and pollute the water! Copper pipes can play a positive role in the health of the human body. The danger of copper exceeding the standard: Although copper is an important essential trace element, it can easily cause poisoning if it exceeds the standard. Mainly caused by the heavy metal ion copper. When a large amount of heavy metals remain in the human body, it is easy to burden the organs in the body, especially the liver and gallbladder. When there are problems in these two organs, the metabolism in the human body will be disordered, cirrhosis, liver. Ascites is even more serious. 3, the harm of cadmium to the human body Causes high blood pressure, causing cardiovascular and cerebrovascular diseases; destroys bone calcium and causes renal dysfunction. 4, the harm of chromium to the human body It can cause numbness in the limbs and mental disorders. 5, the harm of arsenic to the human body It can cause skin pigmentation and lead to abnormal keratinization. The carcinogenic effects of arsenic have been confirmed by IARC and have long-term effects with long incubation periods. In addition to causing skin cancer and lung cancer, arsenic has been reported to cause visceral tumors and leukemia such as liver, esophagus, intestine, kidney, and bladder. Galvanized Steel Coil,Prepainted Steel Coil,Cold Rolled Steel Coil Color Coated Steel Coil Co., Ltd , http://www.nssteel-coil.com