Colloid: a substance that does not dissolve, nor is suspended in a liquid, but is dispersed in a liquid.
胶质：既不溶解也不悬浮，但分散于液体中的物质。
It generates simple substance arsenic by reduction reaction in the colloid system with the existence of protection agent that plays a role of bi-template, dispersing and stabilizing simple substance.
其制备方法是在保护剂存在的胶体体系中，将砷化合物加还原剂还原形成单质砷。
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