Assessment of dispersive liquid-liquid microextraction for the simultaneous extraction, preconcentration, and derivatization of Hg2+ and CH3Hg+ for further determination by GC-MS

作者：Soares Bruno M; Pereira Ederson R; Maciel Juliana V; Vieira Augusto A; Duarte Fabio A^*

来源：Journal of Separation Science, 2013, 36(20): 3411-3418.

DOI：10.1002/jssc.201300599

• GC-MS
• Mercury speciation
• Microextraction
• Water samples

This work reports the development of a dispersive liquid-liquid microextraction method for the simultaneous extraction, preconcentration, and derivatization of Hg2+ and CH3Hg+ species from water samples for further determination by GC-MS. Some parameters of the proposed method, such as volume and type of disperser and extraction solvent, and Na[B(C6H5)(4)] concentration were investigated using response surface methodology. Suitable recoveries were obtained using 80L C2Cl4 (as extraction solvent), 1000L ethanol (as disperser solvent), and 300L 2.1 mmol/L Na[B(C6H5)(4)] (as derivatizing agent). Accuracy was evaluated in terms of recovery and ranged from 87 to 99% with RSD values <7%. In addition, a certified reference material of water (NIST 1641d) was analyzed and agreed with the certified value about 107% (for Hg2+), with RSD values <8.5%. LODs were 0.3 and 0.2g/L, with enrichment factors of 112 and 115 for Hg2+ and CH3Hg+, respectively. The optimized method was applied for the determination of Hg2+ and CH3Hg+ in tap, well, and lake water samples.

• 出版日期2013-10