Dispersive liquid-liquid microextraction for chemical speciation and determination of ultra-trace concentrations of metal ions

作者：El Shahawi M S^*; Al Saidi H M

来源：TrAC-Trends in Analytical Chemistry, 2013, 44: 12-24.

DOI：10.1016/j.trac.2012.10.011

• Chromatography
• Dispersive liquid-liquid microextraction (DLLME)
• Metal ion
• Microextraction
• Miniaturization
• Preconcentration
• Sample preparation
• Speciation
• Spectrochemistry
• Ultra-trace concentration

Recent years have seen an upsurge of interest in developing a low-cost, easy-to-operate, reliable preconcentration technique for precise determination of ultra-trace concentrations of metal ions in aqueous matrices. Dispersive liquid-liquid microextraction (DLLME) is a novel sample-preparation technique offering high enrichment factors from low volumes of water samples.
We compare DLLME, cloud-point extraction and other microextraction techniques. We also highlight the current best practices for analysis and chemical speciation of metal ions in highly salted media.
We strongly recommend the stripping voltammetric technique at modified electrodes coupled to DLLME and other microextraction techniques to develop low-cost, precise methods for ultra-trace concentrations of metal ions in biological and environmental samples.

• 出版日期2013-3