本文提出了以非催化动力学法测定微量硒的新体系,实验结果表明:在一酸性介质中(pH=2.2),在100℃水浴中反应30分钟后,Se~(4+)可与盐酸肼反应产生一个粉红色的产物,此产物的吸光度与0.5—50μg/ml范围内的硒含量线性相关,加入少量的阿拉伯树胶和邻硝基酚可增加体系的稳定性,改善标准曲线的线性关系,提高方法的灵敏度。 In this paper, a new system for the determination of trace selenium by non-catalytic kinetic method is proposed. The experimental results show that Se ~ (4+) can react with hydrochloric acid in an acidic medium (pH = 2.2) The hydrazine reaction produces a pink product whose absorbance is linearly related to the selenium content in the range of 0.5-50 μg / ml. Adding a small amount of gum arabic and o-nitrophenol can increase the stability of the system and improve the linearity of the calibration curve , To increase the sensitivity of the method.