Cadmium is a heavy metal, have relatively high toxicity for plants, animals, related to human health through food. It remained common in soil, rock bottom as ZnS, sfalerit, wientzite. The average land in reserves < 0.1 mg of Cd/kg. The movement of Cd in soil slows, study, learn the rules of change it in the ground is extremely complex. It depends on so many factors in the environment, and the impact of changes it makes the environment becomes more and more complicated. Also likely to be nutritious, it becomes toxic when the concentration exceeds the limit allowed. The absorption of Cd in soil environment fits in on a lot of factors such as the pH of the soil creator source, the sustainability of complex Cd in soil ... The-Cd in soil is also extremely complex. It depends on the species and varieties of plants, plant parts mooic ... Use the cleaning Cd in soil is very difficult and expensive. So to have the preventive measures from the start.
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