除草剤PCPの衛生学的研究 : 第2編 PCP微量分析の検討
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Report II. Discussion on Microdetermination Methods of PCP Pentachlorophenol (PCP) is oxidized through nitric acid treatment to chhloranil, which is colorimetrically determimined. Up to the present time, this PCP analytical method has been used in experimental studies on PCP. But this method is not safisfactory as regards sensitivity or accuracy, and more over, complicated and demands long operation time, so that we have not been able to determine PCP concentrations of the environmental air in industry by this method. Methylene blue method, which is an improved Hatkins's method by the author, and o-tolidine method deviced by author were compared each other. In point of sensitibity and accuracy, o-tolidine method is a little better than the methylene blue method, but the latter is far more concise. In conclusion it is said that the methylene blue method is better than the other in respect of industrial hygienic studies. Report III. Environment of a PCP Granulation Factory The author studied the environmental conditions of a pentachlorophenol (PCP) granulation factory, and discussed of improvement methods. About seventy employees are working in this factory, they are producing 10∼12 tons of products per day, and so this factory belongs to small or middle scale factories, but is has some environmental control equipments. Total output of the electric ventilating fans is 38.5 〓, and scrubbers consume 50∼60m^3 of water per hour. PCP concentrations of factory's environmental air were mainly less than the probable safe concentration limit 0.5mg/m^3 (Amer. Conference of Gov. Ind. Hyg. 1947). In samples of the air at a distance of about 100 meters from the factory, PCP concentrations of about 0.01mg/m^3 were detected. Exhausted water from scrubbers contain PCP of 3.5∼5.0 ppm, which may deteriorate the quality of water of the river and sea. PCP concentrations of LD 50 for 48 hours of fresh water fish was 0.3∼0.6 ppm. Methods of treatment of PCP in water is studied, and it was discovered that active carbon adsorbs some of PCP, though this method is too expensive. Free PCP dissolves only abut 12 ppm in acidic water, so the circulation-precipitation-filtration system may be the most adeguate method.
- 社団法人日本産業衛生学会の論文
- 1963-01-20
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- 除草剤PCPの衛生学的研究 : 第2編 PCP微量分析の検討
- 空気,尿中のペンタクロルフェノール,テトラクロルフェノールの同時定量
- PCP剤中のテトラクロルフェノール,ペンタクロルフェノールの比色定量
- 硝酸性,亜硝酸性窒素の一括定量法
- ο-トリジンによるペンタクロルフェノールの比色定量
- 空気中ニトログリコール,ニトログリセリンの定量