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在1.8—2.0mol/L的磷酸溶液中,在聚乙烯醇存在下,维多利亚蓝B可用于水相直接光度测定阴离子表面活性剂。测定波长在555nm,对于十二烷基苯磺酸钠和十二烷基硫酸钠摩尔吸光系数分剐为7.44×10~4L·mol~(-1)·cm~(-1)和7.48×10~4L·mol~(-1)·cm~(-1)。方法简便快速,毫克量的常见离子不干扰测定,本法可用于河水和生活废水中10~(-7)—10~(-6)mol/L的阴离子表面活性剂的测定,十二次测定变动系数为2.6％,回收率可达96—104％。
In 1.8-2.0mol / L phosphoric acid solution, in the presence of polyvinyl alcohol, Victoria Blue B can be used for aqueous phase direct photometric anionic surfactant. The measurement wavelength was at 555 nm. The molar absorptivities of sodium dodecyl benzene sulfonate and sodium dodecyl sulfate were 7.44 × 10 -4 L · mol -1 cm -1 and 7.48 × 10 ~ 4L · mol ~ (-1) · cm ~ (-1). The method is simple and rapid, and the milligram quantities of common ions do not interfere with the determination. The method can be applied to the determination of anionic surfactants of 10 -7 to 10 -6 mol / L in river water and domestic wastewater. Twelve determinations The coefficient of variation is 2.6% and the recovery rate can reach 96-104%.