海洋硅藻细胞表面物理化学特性对镉累积的影响

硅藻是海洋生态系统中主要的初级生产者,在全球碳循环中扮演重要角色。硅藻在镉(Cd)的生物地球化学循环中同样发挥了关键的作用。营养盐、盐度、pH、光照、温度等因子可改变Cd在硅藻中的累积,但其关键过程尚未清楚。借助多功能原子力显微镜(AFM)、X射线光电子能谱(XPS)、非损伤微测(NMT)等先进表征手段,可定量研究硅藻细胞的表面物理化学特性。本综述讨论环境因子对细胞表面粗糙度的影响,探索粗糙度-表面功能基团-电势之间的联系,从微观层次揭示硅藻细胞与Cd之间的相互作用,诠释硅藻吸附金属Cd的过程。

The Effects of Surface Physicochemical Properties on Cadmium Accumulation in Marine Diatoms

Diatoms contribute over 40% of marine primary productivity, and their accumulation of cadmium (Cd) is closely related to the biogeochemical cycle of carbon. Environmental factors such as light, temperature, and nutrients can affect the diatom Cd, but how these factors influence the Cd uptake by changing the surface properties of diatoms are not fully understood. This review aims to discuss the effects of environmental factors on surface roughness and potential of the diatoms, and tries to illustrate how these properties influence the Cd uptake. The major purpose of this review is to elucidate the relationship among the environmental factors, surface physicochemical properties, and Cd adsorption in diatoms.