川西黄壤磷和氟在不同处理条件下的竞争吸附特征

本研究利用响应面模型分析不同比例生物质炭、初始p H、初始磷浓度以及初始氟浓度下川西黄壤磷和氟的竞争吸附特征,以为土壤氟固定和土壤施肥技术提供新思路。研究表明:在竞争作用下,不同处理条件对磷的吸附量影响大小顺序为:初始氟浓度pH初始磷浓度生物质炭比例;对氟的吸附量影响大小顺序为:初始氟浓度初始磷浓度pH生物质炭比例。考虑到各因素之间的交互作用,根据响应面模型得出在pH、生物质炭比例、初始磷浓度、初始氟浓度等因素的共同影响下的最优反应条件为:p H 5.0、生物质炭比例2.9%、初始磷浓度144.0 mg/kg、初始氟浓度178.8 mg/kg,在此条件下模型预测的磷、氟的吸附量分别为949.6 mg/kg、1 622.0 mg/kg。

Competitive Adsorption Characteristics of Phosphorus and Fluorine in Yellow Soil of Western Sichuan Under Different Treatment Conditions

Excessive fluorine will cause harm to human body, excessive phosphorus will cause eutrophication of water body, which is not conducive to the healthy and sustainable development of society. Response surface method has the advantages of less experiment times and high accuracy. Therefore, this study used response surface model to analyze the competitive adsorption characteristics of phosphorus and fluorine in yellow soil of western Sichuan under different proportions of biochar, initial pH, initial phosphorus concentration and initial fluorine concentration, in order to provide new ideas for soil fluorine fixation and soil fertilization technology Under competition, the order of influence of different treatment conditions on the adsorption of phosphorus is: initial fluorine concentration>pH>initial phosphorus concentration>biochar ratio; the order of influence on the adsorption of fluorine is: initial fluorine concentration>initial phosphorus concentration >pH>biochar ratio. Considering the interaction between various factors. Considering the interaction between various factors, the optimal reaction conditions under the combined influence of pH, biochar ratio, initial phosphorus concentration, initial fluorine concentration and other factors according to the response surface model is: pH =5.0, The biochar ratio was 2.9%, the phosphorus concentration was 144.0 mg/kg, and the fluorine concentration was 178.8 mg/kg. Under these conditions, the model predicted phosphorus and fluorine adsorption amounts were 949.6 mg/kg and 1622.0 mg/kg, respectively.