Iron ion and chromiumion with single electron can absorb the visible light and come into being color.
铁、铬等致色离子存在不成对电子，单个电子吸收可见光，发生跃迁，使含有铁、铬离子的矿物产生颜色。
2
METHODS: Osteoblasts cultured in vitro were divided into two groups: control group with normal saline and ion group with cobalt and chromium ions.
方法：体外培养成骨细胞，实验分两组，对照组给予生理盐水，离子组给予钴、铬离子干预。
3
The results showed that the toxicity of the treated wastes was greatly reduced, and the concentration of Arsenic ion and Chromiumion in the leachate reached the allowable level.