【摘要】 研究了在吐温-60存在下铬(Ⅲ)与4,5-二溴苯基萤光酮(称 Br-PF)的显色反应。结果表明,在 pH 7.5～9.0在85℃水浴中加热10分钟,Cr(Ⅲ)与 Br-PF 形成了灵敏度很高的配合物。其ε(?)为1.74×10(?),其组成比为 Cr(Ⅲ)∶Br-PF=1∶2。Cr(Ⅲ)浓度在0～6μg/25 ml 内遵守比耳定律。本法已用于天然水、电镀废液及土壤中微量铬的测定,结果较为满意。更多还原

【Abstract】 A highly sensitive method for the determina-tion of obromium（Ⅲ）has been establishedwith 4,5-dibromophenylfluorone（Br-PF）in thepresence of Tween-60.The optimum conditionsfor the formation of the complex is at pH 7.5～9.0 by heating at 85℃ for 10 min The apparentmolar absorptivity of the complex is 1.74×10^?l·mol^-1·cm^-1at 585nm.The molar ratio of Cr（Ⅲ）/Br-PF is estimated to be 1:2.Beer’s law isobeyed for chromium（Ⅲ）in the range of 0～6μg/25ml Tolerance limits have been given for 28foreign ions in the presence of masking agents.The simple and rapid method has been success-fully applied to the direcl determination of tracechromium（Ⅲ）in natural water,chromium-plat-ing wastewater and soil.更多还原