各種プラスチックバッグの有機溶剤蒸気濃度の保持率について : 第5報プラスチックバッグ内有機剤蒸気の濃度補正法に関する検討

概要

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The concentration of organic solvents in plastic bags is decreased with time elapsed. It was supposed to permeate in plastic films. Therefore, we assumed that this phenomenon will be approxiamately regulated by the first order reaction (C=C_0e^<-kt>). We got the permeation coefficient (K) by experiments and used in to correct organic solvent concentrations in the plastic bags. In the present experiment, we used Tedlar bags, toluene and ethyl methyl ketone (MEK) as organic solvents and determined the values by gas chromatography. Initial organic solvents concentration and that after t hr standing being taken as C_0 and C. k Values are obtained by the formula C=C_0e^<-kt>. Mean values of k about toluene and MEK were found: k^^-=6.00×10^<-3> and k^^-=4.86×10^<-3>. The results by this correction were as follows: Retention of toluene concentration in 24 hr standing bags showed to increase from 81% to 93%, or, in the case of 96 hr standing bags, it was shown to increase from 56% to 100%. Retention of MEK concentration in 24 hr standing bags showed to increase from 86% to 97%, or, in the case of 96 hr standing bags, it was shown to increase from 68% to 109%.
社団法人日本産業衛生学会の論文
1981-11-20