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应用平衡法研究了红壤对草酸、柠檬酸、酒石酸和苹果酸的吸附行为。结果表明:红壤对有机酸的吸附量随着有机酸平衡溶液浓度的增加而增加,有机酸种类不同,吸附量也不同。有机酸在红壤中的吸附行为均可以很好地用Langmuir、Freundlich和Temkim方程描述,其中以Langmuir方程的拟合效果最好。红壤对有机酸均具有较高的吸附率,在0.5～20mmolL-1初始浓度范围内,草酸、柠檬酸、酒石酸和苹果酸的吸附率最大分别可达89.2%、77.5%、67.4%和47.1%。红壤对柠檬酸、酒石酸和苹果酸的吸附率均随着有机酸初始浓度的增加先急剧下降(<5mmolL-1),之后缓慢下降至趋于平稳;草酸的吸附率则随着初始浓度的增加而增加,在3mmolL-1左右时达到最大,随后降低至趋于平稳。
The equilibrium behavior of red soil on oxalic acid, citric acid, tartaric acid and malic acid adsorption behavior was studied. The results showed that the amount of organic acid adsorbed by red soil increased with the concentration of organic acid equilibrium solution, and the amount of organic acids was different with different amount of organic acids. The adsorption behavior of organic acids in red soil can be well described by the Langmuir, Freundlich and Temkim equations. The Langmuir equation has the best fitting effect. Red soil had higher adsorption rate to organic acids. The maximum adsorption rates of oxalic acid, citric acid, tartaric acid and malic acid were 89.2%, 77.5%, 67.4% and 47.1% in the initial concentration of 0.5 ~ 20mmolL-1, . The adsorption rate of citric acid, tartaric acid and malic acid in red soil decreased sharply with the initial concentration of organic acid (<5 mmol L -1), and then slowly decreased to steady. The adsorption rate of oxalic acid increased with the initial concentration While increasing at 3 mmol L-1 or so, then decreasing to stabilizing.