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在聚乙烯醇存在的1.8mol/L磷酸溶液中,夜蓝与阴离子表面活性剂形成离子缔合物。溶液由绿色变为蓝色,可用于水相直接光度测定阴离子表面活性剂。最大吸收波长555nm,摩尔吸光系数分别为5.72×10~4L·mol~(-1)·cm~(-1)(十二烷基苯磺酸钠),5.77×10~4 L·mol~(-1)·cm~(-1)(十二烷基硫酸钠),4.36×10~4 L·mol~(-1)·cm~(-1)(十二烷基磺酸钠)。方法简便、快速,具有良好的选择性。可用于河水和生活废水中10~(-6)—10~(-7)mol/L阴离子表面活性剂的测定。
In the presence of polyvinyl alcohol 1.8mol / L phosphoric acid solution, the night blue and anionic surfactants to form ion-association. Solution from green to blue, can be used for aqueous phase direct photometric anionic surfactant. The maximum absorption wavelength is 555 nm, the molar absorptivities are 5.72 × 10 4 L · mol -1 · cm -1 (sodium dodecyl benzene sulfonate), 5.77 × 10 4 L · mol ~ ( -1) · cm -1 (sodium dodecyl sulfate), 4.36 × 10 -4 L · cm -1 (sodium dodecyl sulfate). The method is simple, fast and has good selectivity. It can be used for the determination of 10 ~ (-6) -10 ~ (-7) mol / L anionic surfactant in river water and domestic wastewater.