Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, PR China.
Talanta. 2010 Apr 15;81(1-2):673-7. doi: 10.1016/j.talanta.2009.12.056. Epub 2010 Jan 11.
A new method based on a microcolumn packed with ionic liquid-modified silica combined with flame atomic absorption spectrometry has been developed for the determination of trace amount of cadmium (Cd) in environmental samples. The ionic liquid-modified silica sorbent was prepared by the surface of commercial silica was chemically modified with ionic liquid. Several factors influencing the preconcentration efficiency of Cd and its subsequent determination, such as pH of the sample, sample flow rate and volume, concentration of chelating agent, eluent and interfering effect, have been investigated. Cd could be quantitatively retained by ionic liquid-modified silica in the pH range of 9-12, then eluted completely with 2.0 mL of 1.0 mol L(-1) HCl. The detection limit of this method for Cd was 0.60 microg L(-1) with an enrichment factor of 75, and the relative standard deviation (RSD) was 3.7% at the 100 microg L(-1) Cd level. The method has been applied for the determination of trace amount of Cd in water samples with satisfactory results.
一种基于填充有离子液体修饰的硅胶的微柱的新方法，结合火焰原子吸收光谱法，已经被开发用于测定环境样品中痕量镉（Cd）。离子液体修饰的硅胶固定相是通过商用硅胶表面的化学修饰与离子液体制备的。考察了影响 Cd 预富集效率及其随后测定的几个因素，例如样品的 pH 值、样品流速和体积、螯合剂浓度、洗脱液和干扰效应。在 pH 值为 9-12 的范围内，Cd 可以定量地被离子液体修饰的硅胶保留，然后用 2.0 mL 1.0 mol L(-1) HCl 完全洗脱。该方法测定 Cd 的检测限为 0.60 μg L(-1)，富集因子为 75，在 100 μg L(-1) Cd 水平下的相对标准偏差（RSD）为 3.7%。该方法已成功应用于水样中痕量 Cd 的测定。
