摘要
以胶州湾海泊河口和李村河口为对象,研究了其沉积物中的汞向海水的释放。结果表明,在静态条件下,沉积物汞向海水释放,平衡时海泊河口和李村河口沉积物汞的释放量分别为0.0705～0.117μg/g和0.0565～0.0935μg/g;汞的释放通量在前2h最大,随后逐渐减小,通量与温度呈指数正相关。通过对汞释放的热力学分析,汞释放的反应热大于零,分别为9.92kJ·mol-1和9.98kJ·mol-1,说明汞的释放是一个吸热过程;汞的释放是一个熵增过程;两个实验反应的标准自由能变分别为2.34～3.22kJ·mol-1和1.19～2.20kJ·mol-1,而且温度越高,△G0越小,越利于反应向正方向进行。
Releasing of mercury from sediment to seawaer in Haipo and Licun Estuary of Jiaozhou Bay was studied. On balance, the releasing fluxes were 0.070 5～0.117 μg/g and 0.056 5～0.093 5 μg/g respectively. The fluxes reached a maximum at the first two hours, and then decreased gradually. The fluxes were positively correlated to temperature. Through the research of mercury releasing thermodynamic, H0 were 9.92 kJ·mol-1 and 9.98 kJ·mol-1 respectively, the releasing process was endothermic reaction. S^0 was above zero.△G^0.2.34-3.22 kJ·mol^-1 and 1.19-2.20 kJ·mol^-1 respectively. The higher the temperature was, the smaller the AGO. And this could promote mercury releasing.
出处
《海洋通报》
CAS
CSCD
北大核心
2009年第4期107-111,共5页
Marine Science Bulletin
基金
国家海洋局青年海洋科学基金项目(2008423)资助
关键词
沉积物
汞
释放通量
热力学
sediment
mercury
releasing fluxes
thermodynamic
