The harm of heavy metal poisoning?

summary

Heavy metals refer to metals with a density greater than 4.5 g / cm3, such as lead, copper, zinc, cadmium, etc. Although some of them are essential trace elements for human body, once they exceed a certain concentration, they will lead to heavy metal poisoning. So what harm does heavy metal poisoning have to human health? Most people don't know much about it. In fact, the harm of each heavy metal to the human body is different, but usually there will be dizziness, headache, insomnia and other phenomena. The harm of heavy metal poisoning? Come and study with me.

The harm of heavy metal poisoning?

Naturalness: human beings living in the natural environment for a long time have strong adaptability to natural materials. Some people analyzed the distribution of more than 60 common elements in human body, and found that the percentages of most elements in human blood are very similar to their percentages in the earth's crust. However, human tolerance to synthetic chemicals is much less. Therefore, to distinguish the natural or artificial properties of pollutants is helpful to estimate their harm to human beings.

Toxicity: the main factors determining the toxicity of pollutants are their properties, contents and existing forms. For example, chromium has three forms: bivalent, trivalent and hexavalent. Among them, hexavalent chromium is highly toxic, and trivalent chromium is one of the important elements in human metabolism. In natural water, the toxic range of heavy metals is about 1-10mg / L, while the toxic range of mercury and cadmium is 0.01-0.001mg/l.

Spatiotemporal distribution: after entering the environment, pollutants are diluted and diffused with the flow of water and air, which may cause a larger range of pollution from point source to non-point source. Moreover, in different spatial locations, the concentration and intensity distribution of pollutants vary with time.

matters needing attention

Don't let children suck their fingers; Don't let them put foreign matters into their mouth, and form the habit of washing hands before eating; When using food, prevent the words, pictures or trademarks on plastic bags from directly contacting with food, especially fatty food and acidic food (such as fried dough sticks, hawthorn cake, etc.); Avoid using pottery or bowls with colored patterns to hold food, especially acidic drinks; Don't use paint to beautify the walls at home, and teach children not to put painted toys or appliances into their mouths; Don't bring children to play or stay for a long time near the road with cars; Do not give children to eat food with high lead content, such as Songhua eggs. At the same time, parents should pay attention to children's nutritional status, especially the adequate supply of calcium, zinc, iron, vitamin C, vitamin B and protein in the diet, which is beneficial to reduce the load and harm of lead in the body.