关键词: 铜, 吸附, 解吸, 表层土, 心层土, 海相沉积物母质土壤, 长江三角洲

Abstract:

The objective of this study was to investigate the form and spacial distribution of Cu，by analyzing its characteristics in terms of adsorption，desorption and fixation in different marineface sediment matrix soils in the delta region of the Yangtze River. It was shown that for different kinds of surface and subsurface soils，Cu adsorption was well regressed with the Langmuir，Freundlich and Temkin equations，especially the Langmuir equation，through which the maximum adsorption capacities were in harmony with the experimental results. Meanwhile，the Cu desorption data could be regressed by exponential equation. For most soils，the maximum adsorption capacities of Cu by subsurface soils were larger than those of surface soils，yet their desorption capacities of Cu were less than the latter. The fixed adsorption of Cu for different soils were analyzed: for surface soils，Tantu mud was the maximum of fixed Cu，and the minimum was Tansha mud; for subsurface soils，the maximum was Tanchao mud，and the minimum was Tansha mud. OM，pH and other factors might have an influence on the maximum of fixed Cu of soils. In general，if the soil had higher pH and OM values，its fixed adsorption of Cu was mostly larger than other soils correspondingly.

Key words: Copper, adsorption, desorption, surface soil, subsurface soil, marineface sediment matrix soils, the Yangtze River Delta