1987年9月18日下午3时许,青岛某铝加工厂氧化车间,由于金属酸洗槽质量不佳,槽内约3吨硝酸浸透氧化腐蚀铁质阀门,形成大量棕黄色硝烟雾外溢,弥散于整个车间空气中(未测定当时车间毒物浓度)。全厂百余名职工在仅戴普通纱布口罩的情况下进入现场抢修,出入持续30～60分钟时 September 18, 1987 3 o’clock in the afternoon, Qingdao, an aluminum plant oxidation workshop, due to poor quality metal pickling tank, the tank about 3 tons of nitric acid infiltration iron oxide corrosion valve, the formation of a large number of brown smoke overflow, diffuse In the entire workshop in the air (not determined when the workshop concentration of poison). More than 100 factory workers in the case of wearing ordinary gauze masks to enter the scene repair, access for 30 to 60 minutes