摘要
比较研究了3种农药在两种吸附体上的吸附以及Cu2+其吸附的影响.杀虫脒在Ca-蒙脱石上的吸附率很高且随pH值的升高而降低;在δ-Al2O3上的吸附率较低且随pH值的升高而升高.Cu2+对其吸附无影响,毒莠定在Ca-蒙脱石上无吸附,但可被δ-Al2O3吸附,吸附率随pH值的升高逐渐降低,不受Cu2+的影响.当pH值小于5时,草甘磷在Ca-蒙脱石上的吸附随pH值的升高而略有上升;当pH值大于5时,则随pH值的升高而下降,Cu2+降低了草甘磷的吸附.当草甘磷与Cu2+摩尔比为0.5和1.0时,草甘磷吸附率的降低程度高于摩尔比为2.0时的降低程度.
The adsorption of chlordimeform and picloram on Ca-montmorillonite and δ-Al2O3 as well as the adsorption of glyphosate on Ca-montmorillonite in the presence and absence of copper were studied.The adsorption rate of chlordimeform was much higher on Ca-montmorillonite than on δ-Al2O3, which decreased on Ca-montmorillonite whereas increased on δ-Al2O3 with increasing pH. No apparent effect of copper on the adsorption was found.Picloram was not adsorbed on Ca-montmorillonite with or without copper.The adsorption rate of picloram on δ-Al2O2 was decreased by copper.The adsorption rate of glyphosate on Camontmorillonite increased slightly when pH< 5 while decreased when pH>5 as pH rose.The glyphosate adsorption decreased in a greater extent when the molar ratio of glyphosate to copper was 1 or 0.5 than when the ratio was 2.
出处
《环境科学学报》
CAS
CSSCI
CSCD
北大核心
1996年第1期23-29,共7页
Acta Scientiae Circumstantiae
关键词
铜
农药
蒙脱石
三氧化二铝
吸附
copper, pesticide,montmorillonite,δ-Al2O3,adsorption.