模拟沉积物中溶质的分布需要精确地计算出扩散系数。虽然可在松散沉积物中直接测量到扩散系数(Krom与Berner等,1980),但这些测量方法很费时间,而且还需要分别对所研究物质的反应速率和吸收特性进行单独的计算。确定松散沉积物中扩散系数的另一种方法为校正对沉积物构造有影响的自由溶液扩散系 Simulating the distribution of solutes in sediments requires accurate calculation of the diffusion coefficient. Although diffusivity can be measured directly in loose sediments (Krom and Berner et al., 1980), these measurements are time-consuming and require separate calculations of the reaction rates and absorption characteristics of the materials studied, respectively. Another way to determine the diffusion coefficient in loose sediments is to correct for free solution diffusion that has an effect on sediment formation