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乾性油の促進黄変試験 AN ACCELERATED TEST OF THE YELLOWING OF DRYING OILS 竹下, 寿雄 TAKESHITA, Toshio 宮内, 徳之 MIYAUCHI, Noriyuki 576 An accelerated test using filter paper for the determination of the yellowing of drying oils is described. The method is as follows: 50mg of sample are placed drop by drop in the center of a 40x40mm square of Toyo No. 3 filter paper, then the unit is placed in a desiccator filled nitrogen for about 1 hr. for the purpose of diffusing the sample over the surface of the paper. The filter paper film is then placed in a desiccater containing NaCl saturated aq. solution. The desiccator is put in an forced draft oven keeped at 50°C or 75°C, and the amount of yellowing is determined by the difference in the absorbance measurements at 440mμ and 720mμ, using a clean white filter paper as reference standard, which is measured once a day for 5 days (75°C) or 10 days (50°C) in a Hitachi Model EPU-2 spectrophotometer, equipped with a reflectance accesory. Results of the tests on a number of common drying oils showed good agreement with the obserbed yellowing. departmental bulletin paper 鹿児島大学 Kagoshima University 1965-09 VoR application/pdf 鹿児島大学工学部研究報告 5 109 111 The research reports of the Faculty of Engineering, Kagoshima University 0451212X AN00040363 https://ir.kagoshima-u.ac.jp/record/12675/files/AN00040363_v5_p109-111.pdf http://hdl.handle.net/10232/10804 https://ir.kagoshima-u.ac.jp/records/12675 jpn open access