在Mn(Ⅱ)下二安替比林对甲氧基苯基甲烷与Cr(Ⅵ)的光度法研究

Application of Diantipyryl Methoxy-Phenyl Methane Spectrophotometry in the Determination of Cr(Ⅵ)with the Presence of Mn(Ⅱ)

在Mn(Ⅱ)和1%(体积比)Tween-20条件下,研究了二安替比林对甲氧基苯基甲烷(DAPMM)与Cr(Ⅵ的显色反应条件,研究结果表明,最大吸收波长λ_(max)=450 nm,表观摩尔吸光系数ε=6.18×10~4L·mol^(-1)·cm^(-1);在50m L溶液中Cr(Ⅵ)的浓度在0~0.7μg/m L范围内符合朗伯-比尔定律。该体系对Cr(Ⅵ)选择性好,稳定性好,可用于微量及痕量Cr(Ⅵ)的样品测定,结果满意。

This paper studies the optimum conditions of diantipyrine methoxy-phenyl methane （ DAPMM ） speetrophotometry in the determination of Cr （Ⅵ） with the presence of Mn （Ⅱ） and 1% （ V/ V ） Tween-20. The results show that the maximum absorbance of the system is at 450 nm. The apparentmolar absorptivity is ε=6.18×10^4L·mol^-1. In 50mL solution, the Lambert Beer＇ s law is obeyed with the concentration of the Cr （Ⅵ） in the range of 0-0.7μg/mL. The system has good selectivity and is stable for a long time, can be applied to determine trace Cr （Ⅵ） in the samples with satisfactory results.