【摘要】 <正> 石棉除能引起人类石棉肺外,已被公认为确定的致癌物质,它使接触者肺癌发病率大大提高,并可引起间皮瘤,因而引起广泛的关切。测定其在空气中的含量是必要的监测手段。我国沿用重量法测石棉尘,但此法不能区分采得的粉尘样品中有多少是石棉尘,因而不是理想方法。采用石棉纤维计数测定法,可对有致病意义的呼吸性石棉纤维进行计数,同时排除了其他杂质,在衡量石棉对健康的危害性上较为真实。目前国外所用石棉纤维计数测定的常规更多还原

【Abstract】 The surface structure, method of clarifying and efficacy of collecting fibres of two different Chinese made filter membranes were studied and compared with Millipore Membrane Type AA. The result shows that the Chinese millipore membrane is better than perchloride membrane and is similar to the membrane Type AA, according to the above mentioned properties. Hence this membrane is suggested to be used in China for the purpose of evaluating airborne asbestos fibres. An airflow rate of 2 L/min should be kept to during sampling, and clarification should better be done bY acetone vapour and triacetin method. The counting should be performed under the phase contrast microscope. A special gra ticule similar to Porton Graticule has been produced and is available. Some problems in the application of this method are discussed.更多还原