摘要
Filtration with a membrane filter was studied to remove cationic surfactants (CS) which interfered with the spectrophotometric determination of nonionic surfactants (NS) with thiocyanateiron (III) or thiocyanate-cobalt (II). Materials of the filter, filter pore size and suction rate were studied to separate NS from CS. After the addition of anionic surfactants (AS) to a sample solution, the sample solution was filtered with a polyvinylidenedifluoride membrane filter (pore size 0.1 μm). NS in the sample solution was filtered through the filter, while CS associated with AS remained on the filter. The NS in the filtrate was extracted into toluene with thiocyanateiron (III), and was measured spectrophotometrically. The procedure was as follows one milliliter of LAS solution (0.5 mg/ml) was added to a 50 ml sample, which was filtered at a suction rate 3-6 ml/min. After washing the filter with water, 5 ml of a sodium chloride solution (2 M) and 10 ml of toluene were added to the filtrate and NS in the filtrate was extracted into toluene by shaking for 2 min. After standing for 30 min, 5 ml of a potassium thiocyanate solution (10 M), 5 ml of an iron (III) chloride solution (1 M) and 1 ml of a sodium chloride solution (2 M) were added to the toluene solution and the mixture was shaken for 2 min. NS associated with thiocyanate-iron (III) was formed in the toluene layer, and its absorbance was measured at 510 nm. Good results were obtained in recovery tests using sample solutions containing NS in the range of 0∼0.1 mg/50 ml as heptaoxyethylenedodecylether. This filtration method is easier than the usual ion exchange method.
摘要译文
烷滤波器进行了研究，以除去阳离子表面活性剂（CS），其与所述分光光度法测定非离子表面活性剂的（NS）与thiocyanateiron（III）或硫氰酸钴（II）的干扰。过滤器，滤芯孔径和吸率的材料进行了研究，从NS CS分开。添加阴离子表面活性剂（AS），以试样溶液后，将样品溶液过滤用聚偏膜过滤器（孔径0.1微米）。在样品溶液中的NS是通过过滤器过滤，而CS与AS关联留在过滤器。在滤液中的NS萃取到甲苯与thiocyanateiron（Ⅲ），测定分光光度法。该程序如下的LAS溶液（0.5毫克/毫升）加入到50毫升的样品，将其过滤，在抽吸速率3-6毫升/分钟1毫升。洗涤过滤后用清水，将5ml氯化钠溶液（2M）和10毫升甲苯加入到滤液中的滤液和NS被摇动2分钟，萃取入甲苯中。静置30分钟后，将5ml一个硫氰酸钾溶液（10μM），5铁（III），氯化溶液（1M）和1ml的氯化钠溶液（2M）中的溶液加入到该甲苯溶液中，将混合物振摇2分钟。用硫氰酸铁（Ⅲ）相关联的NS形成于甲苯层，并且其测量吸光度在510nm处。了良好的结果在使用含有生理盐水中的0~0.1毫克/ 50 ml为heptaoxyethylenedodecylether范围样品溶液恢复试验获得。这种过滤方法是比通常的离子交换法更容易。
Shigenori MUKAI[1];Eiko NAKAMURA[1]. Spectrophotometric determination of nonionic surfactants after removing of cationic surfactants by filtration with a membrane filter[J]. BUNSEKI KAGAKU, 2001,50(10): 709-712