Department of Analytical Chemistry, Faculty of Chemistry, Regional Campus of International Excellence Campus Mare Nostrum, University of Murcia, Murcia, Spain.
Talanta. 2013 Jun 15;110:46-52. doi: 10.1016/j.talanta.2013.02.015. Epub 2013 Feb 13.
A procedure for the determination of ultratrace levels of lead and cadmium using dispersive liquid-liquid microextraction followed by electrothermal atomic absorption spectrometry (ETAAS) has been developed. The ionic liquid, 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C8MIm][NTf2]), is formed in situ and used to extract the lead and cadmium complexes with ammonium pyrrolidinedithiocarbamate. The very fine droplets of ([C8MIm][NTf2]) allow effective dispersion without the need for organic solvents. After centrifugation, the concentrations of lead and cadmium in the sedimented phase can be determined by ETAAS. Using a 10 mL aqueous sample, the enrichment factor of the procedure was 280 and detection limits of 0.2 and 3 ng L(-1) were obtained for cadmium and lead, respectively. The relative standard deviations for 10 replicates at the 10 ng L(-1) cadmium and 0.2 μg L(-1) lead levels were 6.5 and 7.3%, respectively. The method was successfully applied to the analysis of waters as well as to lixiviates obtained from toys made of plastic materials.
采用分散液液微萃取结合电热原子吸收光谱法（ETAAS）测定痕量铅和镉的方法已经建立。离子液体 1-辛基-3-甲基咪唑双（三氟甲基磺酰基）亚胺([C8MIm][NTf2])就地形成，并用于萃取与氨三吡啶二硫代甲酸盐形成的铅和镉配合物。([C8MIm][NTf2])的非常细小的液滴允许在无需有机溶剂的情况下进行有效分散。离心后，通过 ETAAS 可以测定沉淀相中铅和镉的浓度。使用 10 mL 水样品，该方法的富集因子为 280，镉和铅的检测限分别为 0.2 和 3 ng L(-1)。在 10 ng L(-1)镉和 0.2 μg L(-1)铅水平下，10 个重复的相对标准偏差分别为 6.5%和 7.3%。该方法成功应用于水以及从塑料材料制成的玩具中浸出液的分析。
