Liu Yan, Liang Pei, Guo Li
College of Chemistry, Central China Normal University, Wuhan 430079, PR China.
Talanta. 2005 Nov 15;68(1):25-30. doi: 10.1016/j.talanta.2005.04.035.
Nanometer titanium dioxide immobilized on silica gel (immobilized nanometer TiO(2)) was prepared by sol-gel method and characterized by using X-ray diffraction (XRD) and scanning electron microscope (SEM). The adsorptive potential of immobilized nanometer TiO(2) for the preconcentration of trace Cd, Cr, Cu and Mn was assessed in this work. The metal ions studied can be quantitative retained at a pH range of 8-9, and 0.5molL(-1) HNO(3) was sufficient for complete elution. The adsorption capacity of immobilized nanometer TiO(2) for Cd, Cr, Cu and Mn was found to be 2.93, 2.11, 6.69 and 2.47mgg(-1), respectively. A new method using a microcolumn packed with immobilized nanometer TiO(2) as sorbent has been developed for the preconcentration of trace amounts of Cd, Cr, Cu and Mn prior to their determination by inductively coupled plasma atomic emission spectrometry (ICP-AES). The method has been successfully applied for the determination of trace elements in some environmental samples with satisfactory results.
采用溶胶 - 凝胶法制备了负载在硅胶上的纳米二氧化钛（负载型纳米TiO₂），并通过X射线衍射（XRD）和扫描电子显微镜（SEM）对其进行了表征。本工作评估了负载型纳米TiO₂对痕量镉、铬、铜和锰的预富集吸附潜力。所研究的金属离子在pH值为8 - 9的范围内可被定量保留，0.5molL⁻¹的硝酸足以实现完全洗脱。负载型纳米TiO₂对镉、铬、铜和锰的吸附容量分别为2.93、2.11、6.69和2.47mgg⁻¹。开发了一种以填充有负载型纳米TiO₂的微柱为吸附剂的新方法，用于在电感耦合等离子体原子发射光谱法（ICP - AES）测定痕量镉、铬、铜和锰之前对其进行预富集。该方法已成功应用于一些环境样品中痕量元素的测定，结果令人满意。
