Department of Chemistry, University of Isfahan, Isfahan 81746/73441, Iran.
J Hazard Mater. 2009 Dec 15;172(1):229-33. doi: 10.1016/j.jhazmat.2009.06.163. Epub 2009 Jul 5.
A sensitive, simple separation and solid-phase procedure, which is sorption and desorption of cadmium on modified clinoptilolite zeolite (with surfactant and neothorine), for preconcentration of cadmium prior to analysis by FAAS is described. The sorbent has exhibited good sorption potential for cadmium at pH 5. Cadmium was eluted from the column by nitric acid which resulted in preconcentration factor of 160. Thermodynamic behaviors for the process are investigated and adsorption process is interpreted in term of Freundlich equation. A detection limit of 0.015 ng mL(-1) was obtained and it is shown that calibration curve is linear from 0.01 to 4.0 microg mL(-1) in the final solution. Furthermore, the effects of various parameters such as pH, flow rate of the sample and eluent solution were studied. This method was successfully applied for determination of cadmium in various plant and real water samples.
描述了一种灵敏、简单的分离和固相程序，即在 FAAS 分析之前，通过表面活性剂和新托宁在改性斜发沸石（沸石）上吸附和解吸来预浓缩镉。在 pH 值为 5 时，该吸附剂对镉具有良好的吸附能力。用硝酸从柱上洗脱镉，从而得到 160 的预浓缩因子。研究了该过程的热力学行为，并根据 Freundlich 方程解释了吸附过程。得到的检测限为 0.015ngmL(-1)，表明最终溶液中校准曲线在 0.01 至 4.0μgmL(-1)之间呈线性。此外，还研究了各种参数如 pH 值、样品和洗脱液的流速等的影响。该方法成功地应用于各种植物和实际水样中镉的测定。
