镉,是一种重金属,银白色,有光泽,化学符号Cd。镉是人们在焙烧矿石及湿法取矿时,被释放到废水废渣中的,并通过水源进人农田,进而使水稻吸收了镉。医学研究表明,镉进人人体,主要在肝、肾部积累,并不会自然消失,经过数年甚至数十年慢性积累后,人会出现镉中毒症状:损伤肾功能,骨骼生长代谢障碍,骨痛、骨 Cadmium, is a heavy metal, silvery white, shiny, chemical symbol Cd. Cadmium is released into wastewater and waste residue during roasting and wet extraction, and enters the farmland through water sources, which in turn causes the rice to absorb cadmium. Medical research shows that cadmium enters the human body, mainly in the liver and kidney accumulation, and does not disappear naturally, after years or even decades of chronic accumulation, people will appear symptoms of cadmium poisoning: impairment of renal function, bone growth and metabolic disorders, Bone pain, bone