色素を用いるイオン性界面活性剤の定量法 (第2報)
トルイジンブルー法
1959 年 79 巻 4 号 p. 526-530
詳細
1959 年 79 巻 4 号 p. 526-530
In a two-phase titration using anionic surface-active agent as a titrant, toluidine blue was found to be the best indicator. Titration of a solution adjusted to pH 8, in the presence of chloroform, with this dye as an indicator results in the change of chloroform layer from crimson to blue and determination of the end-point can be made easily and accurately. Using 0.005M anionic surface-active agent as a titrant, 5-20mg. of cationic and anionic surface-active agent can be titrated with accuracy of ±0.2% or less. It was also shown that toluidine blue can be used as a reagent for colorimetric determination of anionic surface-active agents in a concentration range of 1×10-6 to 1.5×10-5M.
