煙草の煙粒子に関する研究

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  • 森口 実
    東京医科歯科大学医学部衞生学教室

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タイトル別名
  • Studies on the Cigarette Smoke Particles
  • タバコ ノ エン リュウシ ニ カンスル ケンキュウ

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The recent investigations on the physiological effects of tobacco smoke suggest that the study of the particle size distribution and the filtrative characteristics of the cigarette smoke would be of interest, because such information is of value in studying the retention of the smoke at lung alveoli or the upper respiratory tract.<br>For this purpose, the cigarette smoke, produced under various realistic conditions, was sampled with an oscillating thermal precipitator, improved by the author, and the samples were observed electronmicroscopically, on the other hand, the smoke was collected with a three stage cascade impactor, and the weight of the sample of each stage was measured.<br>The results obtained were as follows.<br>1) In the general feature of the cigarette smoke droplets, many of the larger size droplets contained small particles, probably of carbon black.<br>2) The cigarette smoke particles had conspicuously hygroscopic character, and they the tendency of rapid coagulation.<br>3) The paritcle size distribution of the smoke was variable according to the smoking portion of the cigarette or the smoking power of the smoker. In general, it could be fitted to the logarithmic gamma distribution with rather goodness.<br>4) The parameters of each particle size distribution were calculated, but there was no appreciable diference between plain and filter cigarette smoke.<br>5) From the average or the mode of the smoke particle diameter, it was evident that the stronger the smoking power was the smaller the particles were produced, and in comparison with the smoking portion the smoking of the head portion produced smaller particles.<br>6) From the weight of the smoke in one puff, it could be said that the smoke weight ratio of the head smoking to the rear smoking was about 1:2 and the head smoking with weak smoking power produced the smallest smoke weight.<br>7) As the results of the filtration efficiency test of filer-tip, the tip was more effective to the larger particles but there was no appreciable effect to smaller particles.

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