【摘要】 在HAc-NaAc的缓冲溶液中 ,银离子与过量的溴离子反应生成的配阴离子能与阳离子表面活性剂十六烷基三甲基溴化铵 (CTMAB)反应 ,生成白色的离子缔合物沉淀 ,该沉淀经离心分离后 ,用氨水溶解 ,以火焰原子吸收分光光度计测定溶液中银的吸收值 ,从而可间接求得阳离子表面活性剂CTMAB的含量 ;该法的线性范围为8.0～120.0mg/L,方法可应用于合成水样和护发素样品中CTMAB含量的分析,加入回收试验的回收率在95 %～106 %。更多还原

【Abstract】 An indirect method for the determination of cationic surfactant cetyl trimethyl ammonium bromide(CTMAB)is reported by flame atomic absorption spectrometry in the HAc-NaAc buffer solution.The silver ion reacts with the excess bromide ions to forman anionic complex ion,and the resulting anionic complex ion combines with CTMAB to form a white precipitation of ion_association complex.The amount of silver ion in the complex can be determined by FAAS after separated and dissolved in ammonia solution,thus the amount of CTMAB can be calculated.The recovery of the method is in the range of95%～106%.The proposed method was successfully applied to the determination of CTMAB in some samples.更多还原