ニュートラルレッドを用いるアルキルベンゼンスルホン酸塩の溶媒抽出吸光光度定量法(ノート)

概要

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A small amount of alkylbenzenesulfonate (ABS) is well extracted into nitrobenzene with neutral red as an ion pair of ABS-neutral red. Maximum extraction is observed when the neutral red concentration is 1×10-4M in the aqueous solution buffered at pH 2.04.5 with acetate and 25 ml of the solution is shaken with 10 ml of nitrobenzene for one minute. A linear calibration curve is obtained over the concentration range of 0.44.0 ppm of ABS in the aqueous layer, and the absorbance of the extract, at 546 nm, is 0.244 per 1 ppm ABS in the aqueous layer. Nitrobenzene is an effective solvent for the extraction of the ion pair, and the color of the extract is very stable and more intense than that obtained by other solvents. The permissible concentration of diverse ions is as follows; sulfate, phosphate, 2000 ppm; common metal ions, such as Ca, Mg, Al, Fe (III), Pb, Zn and Cu, 200 ppm; chloride, 20 ppm; nitrite, bromide, 2 ppm. Nitrate, thiocyanate, iodide, laurylsulfate and p-toluenesulfonate are extracted similary to ABS and give positive error at the 2 ppm level.
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