単分子膜平衡レンズ法による水溶液中の油性汚れ測定法
1976 年 27 巻 2 号 p. 134-137
詳細
1976 年 27 巻 2 号 p. 134-137
In this paper, a method of determing a small amount of oily soil in aqueous solution is introduced.
The outline of the procedure is as follows : A suitable volume of the sample containing oily soil equivalent to 0.52mg stearic acid is evaporated to dryness on a water bath in a porcelain evaporating dish. After the evaporating dish is dry, the residue is transferred to a micro Soxhlet extractor with filter papers (free from oily soil) and extracted with benzen. The extract is transferred to 10 to 25 ml volumetric flask and made up to the mark with benzen. The amount of oily soil in the extract is estimated with the monomolecular film equilibrium lens method presented by T. Tachibana and his coworkers.
With the present method, oily soil, 0.54mg stearic acid equivalent, is determined within an error range of ±5%.
