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CAS :
nature : chemical elements in the environment of space and the location of mobile elements caused enrichment, scattered or disappeared process. Often accompanied by elements of the valence state of change and chemical transformation. Relocation of the main mechanical movement, the physical-chemical and biological migration migration. Factors affecting the movement itself has elements of the physical and chemical nature, geographic conditions and the external environment on the physical and chemical properties; Artificial role have some influence. Relocation of the direction and intensity of environmental and ecological effects also vary. If phenol, cyanide and other organic pollutants in the migration flow may be diluted or microbial decomposition, conversion, and help improve the environmental quality; Heavy metals mercury, cadmium, etc. migration in the food chain through animal and plant enrichment in vivo, as well as on the human body chronic poisoning.
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