砷(As)是一种广泛存在于自然界的类金属元素,为细胞原浆毒物。近年来,国内外有关学者从流行病学、生理病理学及毒理学的角度,对砷的毒性机制作了系统的研究,结果表明,砷对机体的各组织器官均存在不同程度的损伤。一般情况下,机体免疫毒性的阈值较小,长期小剂量接触某些外源性化学物质后,其实质 Arsenic (As) is a kind of metalloid element widely existed in nature, which is a cell puree poison. In recent years, domestic and foreign scholars have systematically studied arsenic toxicity mechanisms from the perspectives of epidemiology, physiology and pathology and toxicology. The results show that arsenic has various degrees of damage to tissues and organs of the body. Under normal circumstances, the body’s immune toxicity threshold is small, long-term low-dose exposure to certain exogenous chemicals, the essence