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在HAc—NaAc缓冲系中,Fe(Ⅱ)和Fe(Ⅲ)的邻二氮菲络合物的吸收光谱在390.5nm有等吸收交叉点,同时Fe(Ⅱ)络合物的最大吸收波长为510nm.在此波长下Fe(Ⅲ)也有吸收.本文选择上述两波长,按双组分分光光度计算法,导出了吸光度与Fe(Ⅱ)和Fe(Ⅲ)浓度的相关计算公式.在0～15μg/mL Fe(Ⅱ)及0～25μg/mL Fe(Ⅲ)范围服从Beer定律.标准混合物测定误差Fe(Ⅱ)为-3.43％～2.33％;Fe(Ⅲ)为-1.15％～+1.55％.并用于水稻土中Fe(Ⅱ)和Fe(Ⅲ)的同时测定.铁的回收率为Fe(Ⅱ)90,6％～98,3％;Fe(Ⅲ)97.4％～102％.对19种阴阳离子作了干扰试验。
In the HAc-NaAc buffer system, the absorption spectra of the phenanthroline complexes of Fe (Ⅱ) and Fe (Ⅲ) have equal absorption crossovers at 390.5 nm, and the maximum absorption wavelength of Fe (Ⅱ) complexes is 510 nm. At this wavelength, Fe (Ⅲ) is also absorbed.In this paper, we choose the above two wavelengths and calculate the correlation between absorbance and Fe (Ⅱ) and Fe (Ⅲ) concentration by two- The Beer’s law was obeyed for the range of 15 μg / mL Fe (Ⅱ) and 0-25 μg / mL Fe (Ⅲ) .The error of the standard mixture was -3.43% -2.33% and the Fe (Ⅲ) was -1.15% -1.55% , And was applied to the simultaneous determination of Fe (Ⅱ) and Fe (Ⅲ) in paddy soils.The recovery rate of iron was 90.6% ~ 98.3% for Fe (Ⅱ) and 97.4% ~ 102% for Fe (Ⅲ) Kinds of negative ions made interference test.