| 摘要 |
A single-phase method for quantitatively measuring the anionic surfactant content of an aqueous machining fluid is provided. The method is carried out at a pH value of from about 1.5 to about 3.0 and from about 9.5 to about 10.6 and involves the addition of an excess of a standardized aqueous solution of 1,3-didecyl-2-methylimidazolium chloride to the sample of aqueous machining fluid and then back titrating the excess 1,3-didecyl-2-methylimidazolium chloride with a standardized aqueous solution of polyvinylsulfuric acid potassium salt in the presence of toluidine blue indicator. Values of the amount of 1,3-didecyl-2-methylimidazolium chloride amount corresponding to anionic surfactant concentration are produced by conducting the method using a series of standard aqueous solutions containing anionic surfactant at known concentrations. These values are used to quantitatively determine the anionic surfactant content of a sample of aqueous machining fluid of unknown anionic surfactant concentration from measured values of 1,3-didecyl-2-methylimidazolium chloride obtained according to the method using the sample. |
