红壤和褐壤对F^-、Cr_2O_4^(2-)、和Pb^(2+)的吸附特性对比

Comparison on Characteristics of Absorption of F^-,Cr_2O_4^(2-) and Pb^(2+) by Red Soil and Cinnamon Soil

对比了红壤和褐壤对F-、Cr2O2-4和Pb2+等离子的静态和动态吸附特性。结果表明,土壤对其中阴离子的吸附容量为600~3000 mg/kg,符合单层吸附,而对阳离子吸附随溶液浓度升高而上升,在300 mg/L的Pb2+溶液内吸附容量达16000 mg/kg,红壤对F-的吸附性比褐壤强,而对Cr2O2-4和Pb2+则相反;土壤对F-的动态吸附速率最快,容量为338~800 mg/kg,Pb2+次之,容量为228~293 mg/kg,而Cr2O2-4几乎不吸附。

The static and dynamic characteristics of absorption of F-, Cr2O4^2-and Pb2＋ by red soil and cinnamon soil were compared. The results indicated that the absorption of anion was in accord with the single layer model, whose capacity was 600 - 3000 mg/kg, while the other was in accord with multi - layer model, the capacity increased as the concentration of the solution went up, which was up to 16000 mg/kg when the concentration of Pb2＋ in the solution was 300 mg/L. The F-was stronger absorbed by red soil, whileCr2O4^2--and Pb2＋ was weaker. The dynamic experiment showed that the speed of absorption was different, the F- was the fastest, of which the capacity was 338 - 800 mg/kg, the Pb2＋ took the second place with 228 -293 mg/kg, and the Cr2 O4^2- was almost not absorbed by soil.