据研究,过量的重金属镉(化学元素符号为Cd)会对生物体产生毒害,甚至引发癌变。为此,欧洲国家制定了不同食物中镉含量标准。例如,禾谷类作物以0.1毫克/千克为警戒线,0.2毫克/千克为最高限。上世纪90年代初,部分由美国北达卡塔州生产的硬质小麦,在销往欧洲国家时被检出含有超量的 According to the study, excessive cadmium (chemical element symbol Cd) will be toxic to organisms, and even lead to cancer. To this end, European countries have developed a cadmium content of different food standards. For example, cereal crops at a warning level of 0.1 mg / kg and a maximum of 0.2 mg / kg. In the early 1990s, hard wheat, produced in part in North Dakata, U.S.A., was detected as containing excess