氨含量不合格是制备注射用水较棘手的问题,影响其质量的因素关键是常水中含有较多的有机物质及蒸馏器锅内水存放过久,杂质过多造成。我院1985～1989年曾因常水质量因素造成注射用水氨含量不合格。我们采用常水用高锰酸钾予处理;从重蒸馏器蒸发塔处加入乳酸5～10ml 即可制备氨含量附合药典规定的注射用水30～40万ml。 Unqualified ammonia content is more difficult to prepare water for injection, the key factors affecting the quality of the water is often contained in more organic matter and distiller pot water stored too long, caused by excessive impurities. Our hospital from 1985 to 1989 caused by water quality factors injection water ammonia content unqualified. We use Changshui with potassium permanganate pretreatment; distilled water from the distillation column at the lactic acid added 5 ~ 10ml can be prepared with ammonia content of Pharmacopoeia injection of 300,000 to 400,000 ml.