溶解有机碳在混合水中的行为研究

The Behavior of Dissolved Organic Carbon(DOC) in Mixtures of Freshwater and Seawater

研究溶解有机碳(DOC)在海水和黄河水所组成的混合水中的迁移转化行为,结果表明,海水和已过滤黄河水混合时,DOC呈近似的保守性;海水与未过滤的黄河水混合时,DOC呈明显的非保守性。通过研究沉积物对DOC的解吸过程,发现沉积物在盐水中能解吸出DOC,随着盐度的增大,其解吸量也迅速增大。因此可以认为,DOC在河口区的非保守行为是DOC的絮凝和颗粒物的解吸共同作用的结果。

The behavior of dissolved organic carbon （DOC）in mixtures of freshwater and seawater was studied by a simulation experiment. The results show that DOC is nearly conservative in mixtures of seawater and filtrated river water. On the contrary, DOC shows a nonconservative property in mixtures of seawater and unfiltrated river water. The variation of DOC may be caused by the conglomeration or dissolution of dissolved organic matter from particulate matter. The dissolve process of DOC from particulate matter was studied using sediments collected from the South China Sea, and the results show that DOC can be separated out from particles and the quantity increases with salinity.