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研究了不同碱化度B、不同铝铁摩尔比的聚合氯化铝铁 (PAFC)溶液的可见光谱。发现它们在 4 60nm波长处吸光度A与溶液的碱化度B线性相关 ;用该波长处吸光度A对铝铁摩尔比作图出现的折点与它们的 pH nAl/nFe(铝铁摩尔比 )曲线上pH突跃点正好对应。说明这些折点分别代表了不同B 值下溶液中配体OH- 在Fe(Ⅲ )与Al(Ⅲ )羟基配合物间的平衡配比。由此找出了PAFC溶液的碱化度B、总铁浓度 [Fe]T 与它们在 4 60nm波长处吸光度A三者间的关系。
The visible spectra of polyaluminum chloride (PAFC) solution with different degree of alkalinity B and different molar ratios of aluminum to iron were studied. It was found that the absorbance A at 4 60 nm was linearly related to the degree of alkalinity B of the solution; the curves showing the breakpoints occurring with the absorbance A versus the molar ratio of aluminum to iron at this wavelength to their pH nAl / nFe (ferric aluminum molar ratio) Hop on the pH jump point corresponds exactly. These breakpoints represent the equilibrium ratios of the ligand OH- in Fe (III) and Al (III) hydroxyl complexes in solution at different B values, respectively. From this, the relationship between the degree of alkalization B, the total iron concentration [Fe] T and the absorbance A at a wavelength of 4 60 nm was obtained.