制备大输液,需用大量的注射用水。一般常水中含有大量的悬浮物、盐类、有机物、细菌及热原等杂质,不能直接用来制造注射剂,必须将它通过一定的净化流程,除去杂质,才能得到注射用水。制取注射用水的方法,各国药典都有明确的规定。用蒸馏法制备注射用水,是应用较广的传统方法,同时,由于热原的不挥发性,也常被视为制取注射用水最可靠的方法。但实际 Preparation of large infusion, need a lot of water for injection. Normal water contains a lot of suspended solids, salts, organic matter, bacteria and pyrogen and other impurities, can not be used directly to create injection, it must be through a certain purification process, remove impurities in order to get water for injection. Preparation of water for injection method, each country Pharmacopoeia has a clear rule. The preparation of water for injection by distillation is a more widely used traditional method and is often regarded as the most reliable method of preparing water for injection because of its non-volatility. But actually