| 摘要 |
PURPOSE:To perform the quantitative analysis of SO4<--> with good accuracy, by a method wherein an aqueous solution containing NaNO3 or NaClO4 is added to a specimen solution and the resulting mixture is injected into an anion exchange resin column while a nitric acid solution of ferric nitrate to the column passing liquid to measure ultraviolet absorption. CONSTITUTION:A solution specimen 2 of an anionic surfactant and 0.01-0.5M solution of NaNO3 or NaClO4 from a liquid feed part 1 are sent to a specimen introducing part 3 and, after mixing, the solution mixture is injected into an anion exchange resin column 4. To the eluted liquid of the column 4, a 0.01- 1.0M nitric acid solution containing 0.001-0.1M of ferric nitrate is sent from a liquid feed part 6 and both of them are mixed in a mixing part 5 to measure ultraviolet absorption generated by the complex formation of SO4<--> in the eluted liquid and FE<3+> by a fluidized photometer 7 while the measured value is compared with the calibration curve preliminarily obtained from known SO4<--> concn. to record and display the SO4<--> concn. by a recording apparatus 8. By this method, SO4<--> is automatically measured in good efficiency without receiving the the obstruction of the substance coexisting in the specimen solution. |
