施磷条件下有机酸对硅在棕壤中吸附解吸的影响

Effects of Organic Acids on Adsorption and Desorption of Silicon in Brown Earth under Phosphorus Application

试验以棕壤为研究对象,采用室内培养方法,通过对棕壤进行不同处理(加磷酸二氢钙处理、磷酸二氢钙+柠檬酸处理、磷酸二氢钙+草酸处理、磷酸二氢钙+乙酸处理),并用Langmuir方程对其进行拟合分析。其中吸附解吸试验采用恒温批处理平衡法。主要结论如下:有机酸及磷酸二氢钙处理可以降低棕壤对硅的吸附结合力。不同浓度柠檬酸及施用磷酸二氢钙条件下,棕壤对硅的最大吸附量表现为1 mmol/L柠檬酸及磷酸二氢钙处理的吸附量大于2 mmol/L柠檬酸及磷酸二氢钙处理;而加2 mmol/L柠檬酸及磷酸二氢钙处理的棕壤供硅能力较强。

The effects of different organic acids in the presence of brown soil phosphorus and silicate adsorption and desorption characteristics, and carries on the fitting analysis Langmuir equation, Freundlich equation and Temkin equation.The OECD Guidelinel06 batch equilibrium method was used for Padsorption and desorption experiment. The results showed that： Organic acid and calcium dihydrogen phosphate treatment can reduce the soil adsorption of silicon bonding force. Different concentrations of citric acid the maximum adsorption capacity and calcium dihydrogen phosphate conditions in brown soil on＂ silicon performance than 2 mmol L-1 citric acid and calcium dihydrogen phosphate treatment of silicon adsorption capacity for 1 mmol L-1 citric acid; And with 2 mmol L-1 citric acid and calcium dihydrogen phosphate treatment of brown soil silicon supplying ability.