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选取两种常见的近海滩涂养殖海产品菲律宾蛤仔和海带,分别制备了两种海源性生物的可溶性有机物(DOMc和DOMk),研究了海源性DOM影响下汞在胶州湾两种沉积物样品中的吸附解吸特征.结果表明,Elovich方程能够很好拟合不同DOM处理下汞在沉积物中的动力学过程,其次为双常数方程.添加两种海源性DOM均显著提高了汞在沉积物样品中的吸附速率,其中DOMc促进作用最为显著.Langmuir和Freundlich方程均能很好描述汞的等温吸附过程;与对照处理相比,DOMc使两个沉积物样品对汞的最大吸附量分别增加了70.1%和80.9%,DOMk则分别提高了12.4%和10.2%;海源性DOM抑制了沉积物中汞的释放,其中DOMc的抑制作用最强.添加DOM没有改变汞的吸附量随p H的变化趋势,但在相同p H条件下,DOM仍然明显促进了汞在沉积物中的吸附.研究结果显示,近海水产养殖产生的DOM可通过增加沉积物对汞的吸附而降低其生物有效性,而这却在一定程度上抑制了海湾水体中汞的对外交换,从而增加水体汞污染的风险.
Two species of marine culture-derived marine clam and kelp were selected to prepare two kinds of dissolved organic compounds (DOMc and DOMk) of marine-derived organisms. The effects of marine-derived DOM on two sediment samples from Jiaozhou Bay The results show that the Elovich equation can well fit the kinetics of mercury in sediments under different DOM treatments, followed by the bivariate equation.The addition of two sea-dominated DOMs significantly improves the performance of mercury in sediment samples , And DOMc promoted the adsorption of mercury to a maximum extent. Both Langmuir and Freundlich equations describe the isothermal adsorption of mercury very well. Compared with the control treatment, DOMc increased the maximum mercury uptake by two sediment samples by 70.1 % And 80.9% respectively, and DOMk increased by 12.4% and 10.2% respectively. Marine DOM inhibited the release of mercury in sediments, and DOMc had the strongest inhibitory effect. DOM addition did not change the adsorption capacity of mercury with the change trend of p H , DOM still significantly promoted the adsorption of mercury in sediments under the same conditions of p H. The results show that DOM produced by offshore aquaculture can reduce its adsorption of mercury by sediment Material availability, which was suppressed Foreign exchange Gulf of mercury in water to some extent, thereby increasing the risk of mercury contamination of water bodies.