...在烟草及其烟气中生成的具有致癌性极强的有机化合物,在收获的绿色烟叶中并不存在,而是在烟草加工烘烤、发酵阶段以及烟草成品变陈期间形成的。1·3 3,4-苯并芘属于稠环芳香烃,是致癌性很强的有机化合物。1·4硫氰酸钠(NaSCN)是无色潮解性晶体或白色粉末,溶于水,有毒,用于染色等工业。
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Results indicate that all organic impurities can be cleaned out from NaSCN solution with this method.
结果表明，利用高温净化除杂方法，可以把硫氰酸钠中的有机杂质全部去除干净。
Basic NaSCN principle of high - temperature - cleaning is expatiated. A kind of new cleaning method has been suggested here on the foundation of this principle.
论述了硫氰酸钠高温净化除杂的基本原理，以此原理为基础建立起高温净化除杂的新型实施方法。
Using NaSCN as solvent, acrylic fiber was produced by one-step wet spinning process. The effect of spinneret negative draw ratio on fiber formation was discussed.
采用硫氰酸钠为溶剂，湿纺一步法工艺生产腈纶，探讨了喷丝头负拉伸率对纤维成形的影响。
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