摘要:
介绍了一种纳米TiO2试样中铁含量的测定方法。试样用硫酸、硫酸铵溶解,用酒石酸铵掩蔽钛,在pH 5.5的乙酸—乙酸钠缓冲溶液中,邻菲罗啉与铁定量形成橙红色配合物,在分光光度计上510 nm处测量吸光度,表观摩尔吸光系数ε=4.7×104,在100 mL溶液中,铁量在0~100μg范围内符合比耳定律。该方法具有良好选择性,用于纳米二氧化钛样品中铁量的测定,相对标准偏差小于4%,平均回收率在94.95%~105.33%之间。
Abstract:
A determination method of iron content in nano-TiO2 was presented,in which the sample was dissolved into sulfuric acid and ammonium sulfate,the titania ion was masked by ammonium tartrate.The 1,10-phenanthrolin reacted with Fe2+ to form a stable orange-red complex in the medium of CH3COOH—CH3COONa(pH 5.5).The absorbance was measured at the wavelength of 510 nm.The apparent molar absorptivity is 4.7×104 and it is obeyed Beer law in the range of 0~100 μg/100 mL for iron concentration.The proposed method is of very good selectivity for determining iron in nanometer titania samples,the relative standard deviation is below 4%,and the recovery is in the range of 94.95%~105.33%.
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