摘要
以二甲酚橙为显色剂,采用双波长分光光度法测定水中溴化十六烷基三甲基铵。实验确定的测定条件为:最大吸收波长为590 nm,等吸光度点的波长点为509 nm,选择pH为6.86的Na3PO4-Na2HPO4缓冲溶液3.50 mL,0.80 g/L二甲酚橙显色剂2.0 mL,显色时间为5 min。试剂加入顺序对测定结果基本无影响。CTMAB的质量浓度在0~1.2 mg/mL范围内符合比尔定律,标准曲线为ΔA=0.0123ρ+0.0825,相关系数为R2=0.9998,样品加标回收率为99.6%~101.3%。
A method for the determination of cetyhrimethylarnmonium bromide (CTMAB) by dual-wavelength spectrophotometry with xylenol orange as a coloring reagent was proposed. The optimal conditions were as following- the maximum absorbance wavelength was 590 nm, the isosbestic point was at 509 nm, 3.5 mL of phosphate buffer solution (pH 6.86) and 2.0 mL of 0.80 g/L xylenol orange were used, and the coloring time was 5 min. The order of reagents added has no effect on the results. Beer's law was obeyed for CTMAB in the range of 0- 1.2 mg/mL, and the linear regression equation was △A = 0.0123ρ + 0.0825 with the correlation coefficient of 0.9998. The recoveries were 99.6% - 101.3%.
出处
《分析试验室》
CAS
CSCD
北大核心
2008年第5期58-60,共3页
Chinese Journal of Analysis Laboratory
基金
辽宁省教委科研基金(200293080)
沈阳市科学计划(1053125-1-29)项目资助
关键词
溴化十六烷基三甲基铵
双波长分光光度法
二甲酚橙
Cationic surfactants
Cetyltrimethylammonium bromide
Dual-wavelength speetrophotometry
Xylenol orange