【摘要】 <正> 自离子色谱法问世以来,已被广泛应用于微量卤离子的分析,但多用电导检测器检测。近几年来Dionex公司提出了电化学检测器测定卤离子可获得比电导检测更高的灵敏度。为了进一步开发应用,有必要研究有关电化学检测时离子色谱的行为。本文应用银工作电极的电化学检测器研究了氯离子和溴离子的离子色谱,考察了氯和溴离子色谱中负峰的性质,提出应用电化学检测器和电导检测器同时进行测定不同数量级的卤离子的可能性。更多还原

【Abstract】 The results show that when chloride has all been eluted there is no longer chloride in the solution next to the electrode. The large negative dip following the hloride peak is caused, however, in the case of bromide the negative dip is not obvious. This reducing reaction is incomplete which has been proved by conductivity detection. There is extremely small quantities of halides to deposit on the working electrode surface, but after different concentrations of chloride go through electrode reaction it shows that conductivity of chloride is still linear with concentration of chloricle. With the understanding of above reaction process simultaneous determination of small amount of bromide and large amount of chloride by ion chroma tography with dual-detectors is achieved. The available concentration ratio of them amount to 1:2500.更多还原