摘要
研究了平衡时间、温度、pH、离子强度和土壤粒径对E1(雌酮)在土壤中吸附特性的影响.结果表明:E1在土壤中的等温吸附平衡时间约为0.5 h;在温度为10、20和30℃条件下,土壤对E1的Kf(吸附系数)分别为24.72、14.18和9.39,Kd(分配系数)分别为34.79、24.15和13.51,表明随着温度的升高,土壤对E1的吸附量显著降低;土壤对E1的吸附量在pH由3.0增至6.0时呈降低趋势,在pH>6.0～9.0时保持稳定,然后随着pH进一步升高(>9.0～11.0)而继续降低;土壤对E1的吸附量在离子强度由0.005 mol/L升至0.1 mol/L时显著升高,在离子强度>0.1 mol/L时保持稳定;砂粒、粉粒和黏粒对E1的Kf分别为5.17、12.79和25.22,Kd分别为6.80、16.11和39.95,即随着土壤粒径的减小,对于E1的吸附作用显著增加.
In this paper, properties of the Estrone （El） adsorption in the soil affected by factors including equilibrium time, temperature, pH value, ionic strength and soil particle sizes were studied. The results showed that the equilibrium time of isothermal adsorption for E1 in the soil was about for 0. 5 h. At the temperature of 10, 20 and 30 ~C , Kf（ absorption coefficients） for Estrone （ E1 ） in the soil were 24. 72, 14. 18 and 9.39, and the Kd （partition coefficients） were 34.79, 24.15 and 13.51 respectively. As temperature arising, Estrone （ E1 ） adsorptions in the soil dramatically decreased. With increase of pH value, Estrone adsorptions in the soil decreased first （ pH = 3.0- 6. 0） , and then remained stable （ pH = 〉 6.0-9. O） , and finally decreased again （ pH = 〉 9.0-11.0）. With increase of the ionic strength, Estrone adsorptions in the soil firstly increased significantly （ionic strength changed from 0. 005 to O. 1 tool/L）, and then remained stable （ionic strength were bigger than 0. 1 mol/L）. In addition, Kf of the Estrone in sand, silt and clay were 5. 17, 12. 79 and 25.22, while Kd were 6. 80, 16.11 and 39.95 respectively. With decrease of soil particle sizes its adsorption effect on Estrone significantly increased.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2013年第2期208-213,共6页
Research of Environmental Sciences
基金
国家环境保护公益性行业科研专项(200909042)
关键词
平衡时间
温度
PH
离子强度
土壤粒径
Estrone
equilibrium time
temperature
pH
ionic strength
soil particle size
