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��r(sh��)�g��2014-07-17 10:22 ��Դ��h(hu��n)��̌W(xu��)��(b��o) ��: ��x��2020

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�xȡ�F��ʡ�fɽ�V�^(q��)�Ĺ��Ⱦ��Ʒ�M(j��n)�в�ͬ�ΑB(t��i)��ğ��ȥ��О��о�,��о��˟��^��∑Hg��ȥ��Ч��W(xu��)��Լ��ضȺ͕r(sh��)�g��Ⱦ��в�ͬ�ΑB(t��i)��ȥ��,��Y(ji��)��,��ޏ�(f��)��g(sh��)��Чȥ��еĹ��∑Hg�ğ��^�̷��϶��W(xu��)��,��̶��r(sh��)�g��10 min�r(sh��),��S��ضȵ��ߣ��ˮ�ܑB(t��i)��,��}��ܑB(t��i)��͉A�ܑB(t��i)��ʬF(xi��n)��½��½��څ��,��ˮ�ܹ��}��ܑB(t��i)��ʼ�K�ʬF(xi��n)�½�څ�ݣ��f��ͬ�ΑB(t��i)�Ĺ�֮�g�l(f��)��D(zhu��n)��,��ضȞ�250��r(sh��),��S��r(sh��)�g��ӣ��h(hu��n)��L(f��ng)�U(xi��n)��ˮ�ܑB(t��i)��,��}��ܑB(t��i)��,��A�ܑB(t��i)��ܑB(t��i)��ȥ��ʴ��ӣ��ЙC(j��)�|(zh��)�pʧ�^��,��f��ڵ͜��,��L��r(sh��)�g��ﶾ�ԏ�(qi��ng)��ΑB(t��i)��õ��ޏ�(f��)Ч��,��Ҵ˜ض��̎��׻֏�(f��)�r(n��ng)��,��

Ӣ��ժҪ:

Mercury-contaminated soil samples from Wanshan mining area in Guizhou Province were treated with thermal desorption process to investigate the removal of mercury speciations.Removal of ∑Hg and its kinetics were discussed,and the removal efficiencies of different mercury speciations were investigated at different temperatures and times as well.The experimental results indicated that thermal desorption could effectively remove mercury from the soil.Kinetics of thermal desorption process of ∑Hg from soil can be well interpreted by the second rate equation.When treated for 10 min,with the rise of temperature,the concentration of water-soluble mercury,acid soluble-mercury and alkaline solublility mercury in soil were found to decrease at low temperature,then increase afterwards and decrease at last,but the concentrations of the other two mercury speciations decreased all the time,which indicates that transformation may happen between different mercury speciations.At 250��,with the increase of treated time,the concentration of water-soluble mercury,acid soluble mercury,alkaline solublility mercury and nitric acid soluble mercury were reduced greatly,and the loss of organic matter in soil was less,suggesting that low temperature with long-time treatment can reduce the risk of Hg in soil,and help soil to restore farmland tillage.

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