Phase Equilibria Research Laboratory, Department of Chemistry, Faculty of Science, Zanjan University, P.O. Box 45195-313, Zanjan, Iran.
J Hazard Mater. 2010 Jul 15;179(1-3):289-94. doi: 10.1016/j.jhazmat.2010.02.092. Epub 2010 Mar 4.
5-Tert-butyl-2-hydroxy-benzaldehyde oxime (L(1)) and 3,5-di-tert-butyl-2-hydroxy-benzaldehyde oxime (L(2)) are synthesized and characterized by conventional spectroscopic methods. These ligands are used as modifier of octadecyl silica membrane disks for separation and pre-concentration of trace amounts of copper(II) ions, followed by sulfuric or nitric acid elution and flame atomic absorption spectrometric (FAAS) determination. The effect of parameters influencing the extraction efficiency i.e. pH of sample solutions, amount of the oxime, type and volume of eluent, sample solution and eluent flow rates were evaluated. Under optimum experimental conditions, the maximum capacity of the membrane disks modified by 6 mg of L(1) or 4 mg of L(2) was found to be 284.7 (+/-2.8) microg of copper and 382.5 (+/-3.1) microg of copper, respectively. The detection limits of the presented methods are 0.29 ng ml(-1) for L(1) and 0.25 ng ml(-1) for L(2). The enrichment factors are greater than 400 for both cases. These methods were successfully applied to the extraction, recovery and detection of copper in different water samples.
5-叔丁基-2-羟基苯甲醛肟（L(1)）和 3,5-二叔丁基-2-羟基苯甲醛肟（L(2)）通过常规光谱方法合成并进行了表征。这些配体被用作十八烷基硅胶膜盘的修饰剂，用于分离和预浓缩痕量的铜(II)离子，然后用硫酸或硝酸洗脱，并用火焰原子吸收光谱法（FAAS）进行测定。评估了影响萃取效率的参数的影响，即样品溶液的 pH 值、肟的用量、洗脱剂的类型和体积、样品溶液和洗脱剂的流速。在最佳实验条件下，发现用 6 mg L(1)或 4 mg L(2)修饰的膜盘的最大容量分别为 284.7（+/-2.8）μg 铜和 382.5（+/-3.1）μg 铜。所提出方法的检测限分别为 0.29 ng ml(-1) 用于 L(1) 和 0.25 ng ml(-1) 用于 L(2)。两种情况下的富集因子均大于 400。这些方法成功地应用于不同水样中铜的萃取、回收和检测。
