摘要
本文比较研究了Ｃｕ（２＋）在草甘磷、毒莠定和杀虫脒等三种农药条件下在Ｃａ－蒙脱石和δ－Ａｌ２Ｏ３上的吸附。草甘磷降低了Ｃｕ（２＋）在Ｃａ－蒙脱石上的吸附。当草甘磷／Ｃｕ（２＋）摩尔比越高时，Ｃｕ（２＋）吸附的降低量则越大。草甘磷是通过络合机制而降低Ｃｕ（２＋）在Ｃａ－蒙脱石上的吸附，同时增加了Ｃｕ（２＋）在δ－Ａｌ２Ｏ３上的吸附。当草甘磷／Ｃｕ（２＋）摩尔比越高时，Ｃｕ（２＋）吸附的增加量也就越大。草甘磷作为桥而连接δ－Ａｌ２Ｏ３和Ｃｕ（２＋）。毒莠定亦通过络合作用略微降低了Ｃｕ（２＋）在Ｃａ－蒙脱石上的吸附，但它对ＣＵ（２＋）在δ－Ａｌ２Ｏ３的吸附无明显影响。杀虫脒通过对阳离子吸附点位的竞争而降低了Ｃｕ（２＋）在Ｃａ－蒙脱石上的吸附，但不影响Ｃｕ（２＋）在δ－Ａｌ２Ｏ３上的吸附。
The Cu(2+)adsorption on Ca-montmorillonite and δ-Al2O3 in the presence and absence of three pesticides,glyphosate, picloram and chlordimeform, was studied.Glyphosate markedly reduced the adsorption of Cu2+ on Ca-montmorillonite by complexing with Cu2+ ions.The higher the mole ratio of glyphosate to Cu2+, the more the decrease of the Cu2+ adsorbed.Glyphosate increased the Cu2+ adsorption on δ-Al2O3 through 'bridge' bonding with δ-A12O3 and Cu2+.The higher the mole ratio of glyphosate to Cu2+, the more the increase of Cu2+ adsorbed on δ-A12O3. Picloram also decreased slightly the adsorption of Cu2+ on Ca-montmorillonite by means of complexing with Cu2+.However, it did not influence obviously the adsorption of Cu2+ on δ-Al2O3. Chlordimeform decreased the Cu2+ adsorptfon on Ca-montmorillonite through competing for the adsorption sites with Cu2+ions while it showed no effect on Cu2+ adsorption on δ-A12O3.
出处
《土壤学报》
CAS
CSCD
北大核心
1996年第4期344-350,共7页
Acta Pedologica Sinica
关键词
农药
铜
蒙脱石
δ-Al2O3
吸附
Pesticide,Copper,Montmorillonite,δ-Al2O3,Adsorption
