Wang Fei, Wang Ming, Tang Jing-Chun, Zhang Lei
Key Laboratory of Pollution Process and Environmental Criteria (Ministry of Education), College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Huan Jing Ke Xue. 2011 Sep;32(9):2669-75.
This study focused on the adsorption properties of Hg in 2 typical farmland soils in the Linglong gold mining area in Yantai area of China. The adsorption-desorption of Hg(II) research result showed higher adsorption of Hg in neutral soil with the value of 201.38 microg/g than that in acid soil with the value of 156.9 microg/g. The desorption of Hg in both soils was low with neutral soil showing a higher desorption ratio (13%) than acid soil (12%). Hg(II) adsorption isotherms were well fitted by Langmuir and Freundlich equation in the acid soil, with the correlation coefficient r value of 0.995 6 and 0.982 6, respectively. Langmuir equation can best describe Hg(II) adsorption isotherm in the neutral soil and acid soil, with the r value of 0.995 6 and 0.955 9, respectively. The adsorption was a bi-phasic process which started with a fast-adsorption phase and a slow-adsorption phase. The adsorption amount and rate of Hg in the fast reaction phase were much larger than that in the slow one. The adsorption kinetic can be better fitted by Elovich equation with correlation coefficient of 0.971 4 and 0.967 2, respectively. At pH 3.0 - 5.5, the equilibrium adsorption amount of Hg(II) increased with higher pH, and then decreased when the pH reached 6.5.
本研究聚焦于中国烟台地区玲珑金矿区2种典型农田土壤中汞的吸附特性。汞（II）的吸附 - 解吸研究结果表明，汞在中性土壤中的吸附量较高，为201.38微克/克，高于酸性土壤中的吸附量（156.9微克/克）。两种土壤中汞的解吸率都较低，中性土壤的解吸率（13%）高于酸性土壤（12%）。在酸性土壤中，汞（II）吸附等温线能很好地用Langmuir方程和Freundlich方程拟合，相关系数r值分别为0.995 6和0.982 6。Langmuir方程能最好地描述中性土壤和酸性土壤中汞（II）的吸附等温线，r值分别为0.995 6和0.955 9。吸附过程是一个双相过程，开始为快速吸附阶段和慢速吸附阶段。快速反应阶段汞的吸附量和速率远大于慢速阶段。吸附动力学能用Elovich方程更好地拟合，相关系数分别为0.971 4和0.967 2。在pH 3.0 - 5.5范围内，汞（II）的平衡吸附量随pH升高而增加，当pH达到6.
