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在室内培养条件下,以苏打盐碱土为供试土壤,采用平衡振荡法,研究该土对氟的吸附和解吸特征。结果表明,苏打盐碱土对氟的吸附量和解吸量均随着初始氟浓度的增加而增加,最大吸附量为216.97 mg kg-1,最大解吸量为200.17 mg kg-1,而解吸率则呈先降低后升高的趋势,最低解吸率为62.79%。Langmuir方程能够较好的拟合该土对氟的等温吸附过程,但分段拟合结果表明,当初始氟浓度较低时,虽然最大吸附量较大,但吸附强度较弱,吸附的最大缓冲容量较低,致使被吸附的氟极易解吸下来;提高初始氟浓度后,吸附强度增强,解吸率下降,吸附比较牢固。这说明苏打盐碱土对氟的吸附强度受初始氟浓度的影响较大。
Under the condition of indoor cultivation, the sodic saline-alkali soil was used as the test soil, and the equilibrium oscillation method was used to study the adsorption and desorption characteristics of fluorine in the soil. The results showed that the adsorption and desorption amounts of fluoride increased with the increase of initial fluorine concentration in soda ash soils with the maximum adsorption of 216.97 mg kg-1 and the maximum desorption of 200.17 mg kg-1, while the desorption rate was First, reduce and then increase the trend, the minimum desorption rate was 62.79%. The Langmuir equation can well fit the adsorption isotherm process of fluorine in this soil. However, the fitting result of subsection shows that when the initial fluorine concentration is lower, the maximum adsorption capacity is larger but the adsorption strength is weaker. The maximum absorption Lower capacity, resulting in desorption of fluorine easily desorbed down; increase the initial fluorine concentration, the adsorption strength increases, the desorption rate decreased, the adsorption is relatively solid. This shows that the soda ash soil fluoride adsorption intensity by the initial fluorine concentration greater impact.