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Optimization and determination of Cd (II) in different environmental water samples with dispersive liquid–liquid microextraction preconcentration combined with inductively coupled plasma optical emission spectrometry

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Abstract

Dispersive liquid–liquid microextraction followed by inductively coupled plasma-optical emission spectrometry has been investigated for determination of Cd(II) ions in water samples. Ammonium pyrrolidine dithiocarbamate was used as chelating agent. Several factors influencing the microextraction efficiency of Cd (II) ions such as extracting and dispersing solvent type and their volumes, pH, sample volume, and salting effect were optimized. The optimization was performed both via one variable at a time, and central composite design methods and the optimum conditions were selected. Both optimization methods showed nearly the same results: sample size 5 mL; dispersive solvent ethanol; dispersive solvent volume 2 mL; extracting solvent chloroform; extracting solvent volume 200 \(\upmu \)L; pH and salt amount do not affect significantly the microextraction efficiency. The limits of detection and quantification were 0.8 and 2.5 ng L − 1, respectively. The relative standard deviation for five replicate measurements of 0.50 mg L − 1 of Cd (II) was 4.4%. The recoveries for the spiked real samples from tap, mineral, river, dam, and sea waters samples ranged from 92.2% to 104.5%.

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Authors and Affiliations

  1. Environmental Laboratory, Nuclear Science Research School, Nuclear Science and Technology Research Institute, Atomic Energy Organization of Iran (AEOI), P.O. Box 11365-3486, Tehran, Iran

    Maryam Salahinejad & Fereydoon Aflaki

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  1. Maryam Salahinejad
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  2. Fereydoon Aflaki
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Correspondence to Maryam Salahinejad.

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Salahinejad, M., Aflaki, F. Optimization and determination of Cd (II) in different environmental water samples with dispersive liquid–liquid microextraction preconcentration combined with inductively coupled plasma optical emission spectrometry. Environ Monit Assess 177, 115–125 (2011). https://doi.org/10.1007/s10661-010-1622-1

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  • DOI: https://doi.org/10.1007/s10661-010-1622-1

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