Zinc and copper are the most important metals in the study of the problem of pollution, as they are widespread in the world and have toxic properties. Camdia and zinc (as well as lead and mercury) are found mainly in sulphide sediments. As a result of atmospheric processes, these elements easily fall into the oceans. The soils contain approximately 4.5×10 -4%. Vegetation contains a different amount of both elements, but the zinc content in the plant ash is relatively high -0.14, since this element plays a significant role in plant nutrition.
About 1 million kg of gum fall into the atmosphere annually as a result of the smelters’ operations, which is about 45% of the total pollution of this element. 52% of the contamination comes from the burning or processing of products containing stones. Camdium has a relatively high volatility, so it easily penetrates the atmosphere. Sources of atmospheric contamination with zinc are the same as those in the campium.
The contact of a stone in natural waters occurs as a result of its application in galvanic processes and technology. The most serious sources of zinc water pollution are zinc smelting plants and galvanic plants.
Fertilizers are a potential source of contamination by the campium. In this case, the stones are introduced into the plants used by man for food, and at the end of the chain they pass into the human body. Camdia and zinc easily penetrate into the sea water and the ocean through a network of surface and groundwater.
Camdia and zinc accumulate in certain organs of animals (especially in the liver and kidneys).
Zinc is the least toxic of all of the above heavy metals. Nevertheless, all elements become toxic if they come in excess; Zinc is no exception. The physiological effect of zinc is to act as an activator of enzymes. In large quantities, it causes vomiting, this dose is approximately 150 mg for an adult.
Camdia is much more toxic than zinc. He and his compounds belong to the first class of danger. It penetrates into the human body for an extended period. Inhaling air for 8 hours at a concentration of 5 mg / m3 of can lead to death.
When chronic poisoning with a cathode in the urine appears protein, blood pressure rises.
When investigating the presence of the cadmium in food, it was found that the secretions of the human body rarely contain as much of the stones as were absorbed. There is no single world opinion on the acceptable safe keeping of the foodstuff in the food.
One of their effective ways to prevent the entry of stones and zinc in the form of contaminants is to control the content of these metals in the emissions of smelters and other industrial enterprises.
In addition to the metals considered earlier (mercury, lead, cadmium, zinc), there are other toxic elements, which, as a result of people’s activity, cause serious concern to the environment of organisms.