论文部分内容阅读
本文利用季铵离子(十六烷基二甲基苯胺,CDMBA~+)对溴甲酚紫(BCP)的变色反应,研究了一种直接测定水中阴离子表面活性剂(十二烷基硫酸钠(Na·LS))的快速方法。其原理是CDMBA~+在pH 8左右与BCP反应后,在波长588 nm处的吸光度很低,当有LS~-时,CDMBA~+与LS~-形成离子缔合物而游离出蓝色的BCP,并且BCP颜色与LS~-的浓度成正比。本法检出限LS~-浓度在0～1.7×10~5M(约5ppm)范围符合比耳定律,摩尔吸光率约为6×10~4L/mole·cm,方法操作简便,大量阴离子共存对测定无影响,还可用目视比色法对
In this paper, the color reaction of bromocresol purple (BCP) with quaternary ammonium ions (hexadecyldimethylaniline, CDMBA ~ +) was studied. A direct method for the determination of anionic surfactant (sodium lauryl sulfate Na · LS)). The principle is that CDMBA ~ + has a very low absorbance at a wavelength of 588 nm after reaction with BCP at a pH of about 8. When LS ~ - is present, CDMBA ~ + forms an ion association with LS ~ - and leaves a blue BCP, and BCP color is proportional to the concentration of LS ~ -. The detection limit of this method LS ~ - concentration in the range of 0 ~ 1.7 × 10 ~ 5M (about 5ppm) Beer’s law consistent with the molar absorptivity of about 6 × 10 ~ 4L / mole · cm, the method is simple and convenient, a large number of anion coexistence Determination of no effect, but also visual colorimetric method