摘要
采用平衡振荡法,通过加入不同比例的铝、氟来研究硫酸铝对苏打盐碱土吸附氟的影响。结果表明:苏打盐碱土加入硫酸铝以后,能够缩短对氟的吸附平衡时间,并且随着铝用量的增加和吸附时间的延长,氟的吸附量呈增加,而解吸率呈降低的趋势;其中1︰1铝氟摩尔比处理的吸附量高达640.45 mg/kg,为不施铝处理的6.5倍,但是其解吸率最低,为24.7%,为对照处理的0.3倍。这与Al3+和F–络合形成不同比的铝氟配合物,Al3+水解后降低土壤溶液pH,并形成羟基铝,进而与盐碱土中的蒙脱石形成聚合羟基铝–蒙脱石复合体有关。因此,铝的存在可以增加苏打盐碱土对氟的吸附,降低解吸率,进而减小氟在该土中的迁移,降低其生物有效性。
The equilibrium oscillating method was adopted to study the effect of Al2(SO4)3 on the adsorption of fluoride in soda alkali saline soil by adding different ratios of Al and F. The results showed that adsorption equilibrium time was shortened by Al2(SO4)3. The adsorbed F quantity was increased but the desorption rate decreased with adding A1 amount and adsorbing time increasing. The adsorption quantity was 640.45 mg/kg in the 1 : 1 Al to F treatment, 6.5 times higher than that in the no Al added treatment. But its desorption rate was the lowest which was 24.7%, 0.3 times of the control. These were related to the formation of Al-F complex and hydroxy aluminum-montmorillonite complex which produced by hydroxy-aluminum and montmorillonite in the soil after pH deceased in soil solution by Al3+ hydrolysis. Thus, Al can improve the capacity of soda alkali saline soil adsorbing F and decrease desorption rate. These makes F migrate less and decreases its bioavailability in the soil.
出处
《土壤》
CAS
CSCD
北大核心
2014年第4期674-677,共4页
Soils
基金
公益性行业(农业)科研专项(200903001-06-2)
吉林省科技厅基金项目(20130522078JH
20110749)
吉林省教育厅"十二五"规划项目(20130062)
吉林省科技发展计划项目(20130204054SF)资助
关键词
硫酸铝
氟
吸附量
解吸率
苏打盐碱土
Aluminum, Fluorine, Adsorption, Desorption rate, Soda alkali saline soil