On-line Preconcentration and Determination of Copper, Lead and Chromium(VI) Using Unloaded Polyurethane Foam Packed Column by Flame Atomic Absorption Spectrometry in Natural Waters and Biological Samples

Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University, Thessaloniki 54006, Greece.
Talanta (Impact Factor: 3.55). 12/2002; 58(5):831-40. DOI: 10.1016/S0039-9140(02)00373-9
Source: PubMed


A simple, sensitive and low cost, flow injection time-based method was developed for on-line preconcentration and determination of copper, lead and chromium(VI) at sub mug l(-1) levels in natural waters and biological samples. At the optimum pH, the on-line formed metal-ammonium pyrrolidine dithiocarbamate (APDC) complexes were sorbed on the unloaded commercial polyurethane foam (PUF), and subsequent eluted quantitatively by isobutylmethylketone and determined by flame atomic absorption spectrometry (FAAS). All chemical, and flow injection variables were optimized for the quantitative preconcentration of each metal and a study of interference level of various ions was also carried out. The system offered improved flexibility, low backpressure and applicability to all the studied metals. At a sample frequency of 36 h(-1) and a 60 s preconcentration time, the enhancement factor was 170, 131 and 28, the detection limit was 0.2, 1.8 and 2.0 mug l(-1), and the precision, expressed as relative standard deviation (s(r)), was 2.8 (at 10 mug l(-1)), 3.4 (at 50 mug l(-1)) and 3.6% (at 50 mug l(-1)) for Cu(II), Pb(II) and Cr(VI), respectively. The accuracy of the developed method was sufficient and evaluated by the analysis of certified reference materials and spiked water samples. Finally, the method was applied to the analysis of environmental samples.

Download full-text


Available from: George Zachariadis
  • Source
    • "For this reason , researchers have been investigating new processes that would allow using cheap and available raw materials [9]. Adsorption methods seem highly attractive [10] [11] [12] as they effectively remove heavy metal ions from aqueous media. The advantage of these methods is that they use ecological sorbents and do not require advanced technological devices to be carried out. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Industrial processes are responsible for heavy metal releases into the environment. Removal of excessive heavy metals has become a major concern, therefore, new economical and efficient methods of water treatment are now being explored. The experiments described in this paper relate to the removal of heavy metal cations from water. The adsorption process was carried out in a packed column containing foamed chitosan. Initially, a method of production of the foamed structure was developed. Subsequently, the foamed structure was properly prepared for testing. The adsorption process was continuous with constant ion concentration at the column inlet. Parameters such as sorption capacity of the chitosan bed, as well as influence of the initial ion concentration and feed flow rate were investigated. The Bohart–Adams model was used to describe the sorption dynamics.
    Full-text · Article · Aug 2015 · Desalination and water treatment
  • Source
    • "Several studies focus on the design and synthesis of chemosensors for the analysis of toxic or heavy-metal ions such as Hg 2+ , Pb 2+ , and so on (Anthemidis et al., 2002; Gokel et al., 2004; Kumar et al., 2008; Duong and Kim, 2010; Kobayashi et al., 2010; Chen et al., 2011; Zhang et al., 2011; Formica et al., 2012; Kim et al., 2012b; Kim et al., 2012a; Sahoo et al., 2012). "
    [Show abstract] [Hide abstract]
    ABSTRACT: Thiophene-based diimine (R1) and monoimine (R2) were synthesized in a single step, and their cation binding affinity was tested using colorimetric and UV-vis spectral studies. R1 selectively shows a colorimetric turn-on response for Pb(2+) , Hg(2+) ions and colorimetric turn-off with Sn(2+) ions, and R2 shows visual response for Cu(2+) and Hg(2+) over other examined metal ions in aqueous medium. R1 forms 1:1 complex with Pb(2+) , Hg(2+) , and Sn(2+) and exhibits fluorescence quenching, whereas R2 shows 2:1 complex with Hg(2+) , Cu(2+) and shows fluorescence enhancement. The structural and electronic properties of the sensors and their metal complexes were also investigated using Density Functional Theory calculations. R2 was also successfully demonstrated as a fluorescent probe for detecting Cu(2+) ions in living cells. Copyright © 2014 John Wiley & Sons, Ltd.
    Full-text · Article · Mar 2014 · Journal of Molecular Recognition
  • Source
    • "In addition, it has some extra advantages: large availability, easy recovery of the solid phase, attainability of large preconcentration factors and facility for separation using various systems. The most convenient sorbent materials are C18 (Ali et al., 1999), amberlite or Chelex (Ferreira et al., 2000), activated carbon (de Pena et al., 1995) and polyurethane foam (PUF) (Anthemidis et al., 2002). The PUF is an excellent sorbent material due to its high available surface area and extremely low cost. "
    [Show abstract] [Hide abstract]
    ABSTRACT: The polyhydroxyl-polyurethane foam (PPF) was used as a new sorbent for separation, preconcentration and determination of manganese and iron ions in natural samples. Experimental conditions for effective separation of trace levels of the metal ions were optimized with respect to different experimental parameters in batch and dynamic processes. The maximum sorption of Mn(II) and Fe(III) was in the pH range of 6–8. The kinetics of sorption of the Mn(II) and Fe(III) by the PPF was found to be fast with an average value of half-life of sorption (t1/2) of 11.7 min. The sorption capacity of PPF was 8.7 μmol g−1 and the recovery of tested ions 99–100% was achieved. The lower detection limit, 0.08 μg L−1 was evaluated using spectrophotometric method. The relative standard deviation (RSD) under optimum conditions is 1.3% (n = 5). The bonding of the studied metal ions by the PPF is useful for the removal of metal contamination from real samples.
    Full-text · Article · Oct 2013 · Journal of the Association of Arab Universities for Basic and Applied Sciences
Show more