摘要
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。
A spectrophotometric method has been developed for the determination of anionic surfactants based on the formation of ion-associate compounds of night blue with anionic surfactants in aqueous solution in the presence of polyvinyl alcohol. The desirable acidity ranges from. 1.8 to 2.0mol/L of H_3PO_4. The maximum absorption exhibits at 555nm and the molar absorptivities are 5.72 ×10~4L·mol^(-1)·cm^(-1) for dodecylbenzenesulfonate, 5.77×10~4L·mol^(-1) ·cm^(-1) for dodecylsulfate and 4.36×10~4 L· mol^(-1)·cm^(-1) for dodecylsulfonate. The effect of coexisting ion (>20) and detergent additive was examined in detail by the standard procedure. The result indicated that the colour reaction sensitivity and selectivity are fairly good and the method can be applied to direct spectrophotometric determination of aniomic surfactants in river water and waste water. The recovery is 94%—106% and the coefficient of variation ±1.73% (n=11).
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1989年第11期1018-1022,共5页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金
关键词
水
夜蓝
吸光光度法
表面活性剂
Anionic surfactants
Spectrophotometry
Night blue