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TDA(甲苯二胺)和DNT(二硝基甲苯)是合成柔性的聚胺基甲酸乙酯泡沫塑料单体所必需的两种化学品。根据现在的研究表明,这两种化学品会造成男性生殖系统的中毒。在美国肯塔基州勃兰登堡一家化工厂有一位工人,他怀疑他妻子的几次流产是否和他接触工厂里的化学品有关,于是找医生进行鉴定,医生发现他的畸形精子数目很大(尤其是尖头形精子)。这一发现使其他男性工人也纷纷去寻求鉴定,于是美国职业安全卫生研究所便开始插手这个问题。1981年5月8日《发病率及死亡率周报》
TDA (tolylenediamine) and DNT (dinitrotoluene) are two of the chemicals necessary for the synthesis of flexible polyurethane foam monomers. According to current research, both chemicals cause male reproductive system poisoning. At a chemical plant in Brandenburg, Kentucky, there was a worker who questioned whether his wife’s miscarriage had been linked to chemicals in the factory. Then he was asked to find a doctor and the doctor found that he had a large number of abnormal sperm Especially pointy sperm). The discovery prompted other men to seek identification as well, and the Institute for Occupational Health and Safety began to intervene. May 8, 1981 “Morbidity and Mortality Weekly”