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一九八六年11月13日上午7点半,上海市南汇区周浦污水处理厂4位男工人进入尚未改造好的污水处理池内涂氯磺化聚乙烯防腐涂料。污水池高12米,直径8米,顶上口径为2.3米,池顶上口被盖住,在池底部有一直径为1米的进出口。这四位工人既没带防毒面具,池内又无排风设备,加上当时天下小雨;气压低,池内空气对流极差,工作场所苯浓度很高。9点钟时工人们曾出来休息半小时,到11点钟发现四人全部昏迷在池内。
At half past seven on November 13, 1986, four male workers from Zhoupu Sewage Treatment Plant in Nanhui District of Shanghai entered the sewage treatment tank which was not yet reconstructed and coated with chlorosulfonated polyethylene anti-corrosion coating. Cesspool 12 meters high, 8 meters in diameter, the top diameter of 2.3 meters, the top of the pool was covered, the bottom of the pool has a diameter of 1 meter import and export. The four workers either did not wear gas masks and did not have ventilation equipment in the pool. In addition, the weather was drizzly rainy day. The air pressure was low, the air convection in the pool was extremely poor and the benzene concentration in the workplace was high. At nine o’clock the workers had come out to rest for half an hour, and at eleven o’clock they found all four in a coma within the pool.