部分水解聚丙烯酰胺在土壤上静态吸附的研究

采用静态吸附法研究了聚丙烯酰胺（PAM）在黑钙土和盐碱土上的吸附行为。测定了聚丙烯酰胺在土壤上的吸附等温线，考察了不同温度、pH值、离子强度对吸附的影响。结果表明：PAM在土壤上有很强的吸附亲和力，吸附等温线为Langmuir型，温度过高并不利于PAM在土壤中的吸附。pH值对PAM在土壤上的吸附有很大的影响，酸性环境土壤对PAM的吸附呈上升趋势，碱性环境土壤对PAM的吸附呈下降趋势，中性环境最利于盐碱土对PAM的吸附。电解质浓度影响PAM在土壤上的吸附，随着电解质浓度的增大，PAM在土壤上的吸附也增大。

Study on static adsorption of polyacrylamide on soil

The adsorption of polyacrylamide （PAM） on the chernozem and saline-alkali soil is studied by means of static adsorption method. The adsorption isotherms of polyacrylamide on the soil are examined. The effects of static adsorption temperature, pH val- ue and ionic strength on the capacity of PAM adsorption on the soil are examined. The results show that PAM has high adsorptive affini- ty on the soil, the adsorption isotherms are consistent with Langmuir model, and the high temperature is not conducive to the PAM in the soil adsorption. The pH value has effect on the adsorption of polyaerylamide in the soil. The adsorption of the PAM in the acidic environment of the soil displays upward trend, while the downward trend is displayed in the alkaline environment of soil. The neutral environment is most conducive to the saline-alkali soil adsorption of PAM. Electrolyte concentration has effect on the adsorption of PAM in the soil. With increase of the electrolyte concentration, the adsorption of PAM in soil enhances also.