砷及其化合物--qsf999的安全生产小屋

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砷及其化合物 | 2013-7-15 11:21:00

砷及其化合物

砷是冶金中最常见的挥发性物质，所以，在火法冶炼中，极易形成粉尘、烟雾或蒸汽，污染操作环境。

元素砷毒性很小，而它的氧化物、盐类及有机化合物等均有毒性。据测定，砷及其化合物口服致死量为100~200mg，中毒剂量为10~50mg，敏感者其量更低。砷中毒既是常说的砒霜中毒，三价砷的毒性比五价砷的毒性达，砷化氢是剧毒物质。

砷及其化合物作用于神经系统时，会使植物神经技能紊乱，进入血液循环时，导致血管扩张，增强其渗透性。除AsH3可引起皮疹、皮肤干裂、指甲病变，慢性砷中毒常致皮肤合黏膜损害。溃疡、硬皮疹、毛发脱落、结膜炎等；重者可出现剥脱性皮炎、疲倦、眩晕、供给失调、腹痛腹泻、肛大、黄亘、消瘦、贫血、多发性神经炎肝硬化及皮肤癌等。

职业性砷中毒主要由呼吸道引起，它可分布于肝肾及其他组织内，而最易在指（趾）甲和毛发中初留。主要通过肾和消化道排出砷，三价砷化物比五价砷化物毒性高的化合物与肝肾结合迅速且牢固，因此较难排除。

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