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This study was carried out to investigate the adsorption equilibrium of fluoride solution on 1-2 mm granuler activated alumina modified by Fe2(SO4)3 solution.During data processing,a single equation of Langmuir [1] or Freundlich can not fit for all the concentration gap.The analysis that the experiment data of low equilibrium concentration was more in line with Langmuir isotherm model (Figure 2),while that of high equilibrium concentration was more in line with Freundlich isotherm model (Figure 3).A new function,which was combined with Langmuir and Fretmdiich,can be used for the whole concentration gap.