前文研究了水相中铍试剂Ⅲ测定硼的最佳条件,建立了一个过量显色剂隐色新体系。本文在此基础上讨论了有关隐色速率和痕量硼的一阶导数分光光度测量。相当摩尔吸收系数为1.9×10~5L·mol~(-1)·cm~(-1)。将有关水相测定硼的方法与隐色体系做了比较,本法是迄今显色速度最快和灵敏度最高的方法。 In the previous study, the optimum conditions for the determination of boron by beryllium reagent Ⅲ in aqueous phase were studied, and a new system of leuco color of excess developer was established. In this paper, the first derivative spectrophotometric measurement of leuco rate and trace boron was discussed. The equivalent molar absorption coefficient is 1.9 × 10 ~ 5L · mol ~ (-1) · cm ~ (-1). The method for the determination of boron in the aqueous phase is compared with the leuco-vapors system, which is by far the fastest method of color development and the highest sensitivity.