Lü Chang-Wei, Cui Meng, Gao Ji-Mei, Zhang Xi-Yan, Wan Li-Li, He Jiang, Meng Ting-Ting, Bai Fan, Yang Xu
College of Environment and Resources, Inner Mongolia University, Huhhot 010021, China.
Huan Jing Ke Xue. 2012 Jan;33(1):135-41.
Taking surface sediments from the Wuliangsuhai Lake and Daihai Lake as adsorbent, the isothermal adsorption experiments of silicate on sediments were carried out and the adsorption behavior was explained by Langmuir, Freundlich and Temkin crossover-type equations, then the form distribution characters of silicate were studied after adsorption in this work. The results showed that the adsorption behavior of silicate on the two lakes sediments can be linear fitting in the lower concentration dose (< or = 3.00 mg x L(-1)); the sediments from the Wuliangsuhai Lake behaved adsorbing silicate while the sediments from the Daihai Lake behaved releasing silicate under the experimental dose; all of the Langmuir, Freundlich and Temkin crossover-type equations can be used to explain the adsorption behavior of silicate on the two lakes sediments, and the native adsorption silicate (NAS) and equilibrium silicate concentration (ESC(0)) calculated by the three equations could be used to explain the sink and source effects of the sediments from the two lakes; the silicate form distribution in the sediments after adsorption indicated that silicate adsorbed on particles were mainly added on the form of IEF-Si, CF-Si, IMOF-Si and OSF-Si, and the IMOF-Si and OSF-Si had important potential bioavailability.
以乌梁素海和岱海表层沉积物为吸附剂，开展沉积物对硅酸盐的等温吸附实验，并用Langmuir、Freundlich和Temkin交叉型方程对吸附行为进行解释，进而研究吸附后沉积物中硅酸盐的形态分布特征。结果表明，在较低浓度剂量（≤3.00 mg·L⁻¹）下，硅酸盐在两湖泊沉积物上的吸附行为可进行线性拟合；在实验剂量下，乌梁素海沉积物表现为吸附硅酸盐，而岱海沉积物表现为释放硅酸盐；Langmuir、Freundlich和Temkin交叉型方程均可用于解释硅酸盐在两湖泊沉积物上的吸附行为，由这三个方程计算得到的原生吸附硅酸盐（NAS）和平衡硅酸盐浓度（ESC(0)）可用于解释两湖泊沉积物的汇源效应；吸附后沉积物中硅酸盐形态分布表明，吸附在颗粒上的硅酸盐主要以IEF-Si、CF-Si、IMOF-Si和OSF-Si的形式添加，且IMOF-Si和OSF-Si具有重要的潜在生物有效性。
