Chemical Industry makes our exciting and comfortable.But there is a downside - the emergence of environmental substances that are not natural for her.Surely everyone has heard anything about the heavy metals.But not everyone knows the definition of this category of substances.
Heavy metals - substances which have a density of more iron in the natural environment and are found in small quantities.But the new man-made environment, they have a very strong effect on plants, animals and humans.The thing is that they sometimes become too much for maladjusted to such systems, concentration of the substance, whether it is the human body, the body of an animal or plant.
Heavy metals in the water from time to time appear in different parts of the world.This was in Japan.A condition caused by rising concentrations of mercury, called Minamata disease.From her more than a hundred people died, and the number counted in thousands ill.Unhappy people feel extreme weakness, it is very difficult to say, became awkward gait, the field of vision narrows legs numb.In severe cases, it came to a complete loss of vision, and death.It happened this sad event in 1953godu.
The reason was that in Minamata Bay empties into the river.And it merged waste chemical plant.The decaying aquatic vegetation of mercury was obtained methyl mercury - an extremely poisonous substance.The higher up the food chain, it was taken up, the stronger grew the concentration.Most poison accumulates in predatory fish.When methylmercury fall into the human body, it accumulates in the brain, gradually causing all the described problems with the central nervous system.
Also in Japan, there was a story in the basin Dzintsu in the 20s of the 20th century.There's a long time there was a terrible disease: people have deformed bones, and they died with groans, translated into Russian as "sick!".This horror lasted until the 70th, when patients contacted and a claim against the company, which merged into rivers cadmium in the composition of the waste pits.
Heavy metals in the soil are less common, but still recommended to farmers to check their presence in the soil before plant your plants.After all, if you do not suffer, and people and animals, and plants.And it is not only morally unacceptable and punishable, but also profitable.
What is most often found in the soil?Above all, it leads.Where he's from?From the exhaust gases.That is why it is not necessary to collect berries and mushrooms right by the road.And if there is a field?In civilized countries have long standing special fences.Sometimes, the lead gets into the soil with poor-quality insect repellents.So when buying pesticides to testify, be sure to learn at least the ins and outs of the Internet.About
cadmium we said.It may be in the soil.His earlier introduced into the ground with phosphorus fertilizers.Then people became more attentive, but sometimes high concentrations of cadmium in this category fertilizer meets today.
Arsenic is found in the products of recycling, in which the concentration increases, so it is doubtful that the processing of waste - a panacea for environmental well-being.
Previously, the bulk of the pollution with heavy metals useful in developed countries emissions of the chemical industry, now the main problem is related to their high numbers in some fertilizers.Potash did not have the ability to contain cadmium, but the phosphorus can.Therefore it is better to prefer foreign, there are much stricter control.
not worth much to be afraid of heavy metals, but if your area were marked by elevated levels of their content, you need at least one month a year in clean ecological environment.
