生石灰和钙镁磷肥联用对土壤水溶态氟含量影响

Effect of the Combination of Calcium Oxide and Calcium Magnesium Phosphate Fertilizer on Water Soluble Fluorine Content in Soil

以贵州省开阳县金中镇境内某磷肥厂周边的氟污染土壤为研究对象,通过添加改良剂并于室温条件下养护稳定进行修复研究,并分析生石灰(CaO)与钙镁磷肥(FCMP)联用对土壤pH和土壤水溶态氟含量的影响,探讨其影响土壤水溶态氟含量的机理和对氟污染土壤的修复效果。实验共设置了7个CaO与FCMP质量比水平和4个添加量水平,在一致养护条件下,分析不同处理的土壤pH及水溶态氟含量变化。结果表明:CaO与FCMP联用,可以与土壤中氟生成氟化钙、氟磷酸钙等沉淀,并影响土壤胶体、有机基团等对F^-的吸附能力;与CaO、FCMP单独添加相比较,二者联用可以增强改良剂对土壤水溶态氟的抑制效果;综合考虑土壤pH对植物生长的影响、实际应用性价比等因素,CaO与FCMP质量比为3∶1,添加量为土壤质量的0.5%~1.0%时,改良剂对供试氟污染土壤的修复效果最优,可以使土壤水溶态氟含量下降82.94%~86.45%,土壤pH值则由3.94上升至5.71~7.00。

Choosing a fluorine pollution of the soil surrounding a phosphate fertilizer plant in Jinzhong Town,Kaiyang,Guizhou as the research object,and adding ameliorant and curing at room temperature for repair.We analyzed the effect of the combination of quicklime and calcium magnesium phosphate on the pH and water soluble fluorine content in soil with the sample,and discussed its mechanism and repair effect.There were 7 cases with different mass ratio and 4 cases with different added content for the combination of calcium oxide and FCMP settled,and we analyzed the change of pH and water soluble fluorine content in soil under the same curing condition.It can conclude that the combination of calcium oxide and FCMP can be generated with fluoride in soil such as calcium fluoride,fluoride calcium phosphate precipitation,and affected the adsorption abilities of soil colloid and organic group to F-;Compared with calcium oxide and FCMP individually,their combination can enhance the inhibitory effect of modifier on water soluble fluorine in soil;Considering the effect of soil pH on plant and growth practical application cost performance comprehensively,when the ratio of calcium oxide and FCMP quality ratio is 3∶1and addition is 0.5%~1.0%volume of soil quality,the repair effect of soil improver on fluorine pollution would be the best,which can make the soil water soluble fluorine content decreased by 82.94%~86.45%,and pH value of the soil increased from3.94 to 5.71~7.00.