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Microchimica Acta

, Volume 174, Issue 1–2, pp 153–158 | Cite as

Determination of trace palladium in complicated matrices by displacement dispersive liquid-liquid microextraction and graphite furnace atomic absorption spectrometry

  • Pei LiangEmail author
  • Ehong Zhao
Original Paper

Abstract

We describe a method for displacement dispersive liquid-liquid microextraction (DLLME) along with graphite furnace atomic absorption spectrometry for the determination of Pd(II) in complex environmental samples. In this method, Cu(II) is first complexed with diethyldithiocarbamate (DDTC), and the resultant Cu-DDTC complex added to a sedimented phase and submitted to DLLME. In the second step, the sedimented phase is dispersed into the sample solution containing Pd, and another DLLME procedure is carried out. The Pd ions can displace Cu ions from the pre-extracted Cu-DDTC complex because the stability of the Pd-DDTC complex is higher than that of Cu-DDTC. As a result, Pd is preconcentrated. Potential interferences by transition metal ions of lower complex stability can be largely reduced as they cannot displace Cu from the Cu-DDTC complex. The tolerance limits for such ions are better by 2 to 4 orders of magnitude compared to conventional DLLME. The typical sample volume is 5 mL, and an enhancement factor of 96 and a detection limit (3 s) of 7.6 ng L-1 are achieved.

Graphical Abstract

A displacement dispersive liquid-liquid microextraction is developed for the preconcentration of Pd(II) from complicated environmental samples. Potential interferences by transitional metal ions of lower complex stability can be largely reduced, and the tolerance limits for such ions were better by 2 to 4 orders of magnitude compared to conventional DLLME.

Keywords

Displacement dispersive liquid-liquid microextraction Palladium Graphite furnace atomic absorption spectrometry Environmental samples 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of ChemistryCentral China Normal UniversityWuhanPeople’s Republic of China

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