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Copper

  • Preconcentration and determination of heavy metals in water, sediment and biological samples

    Preconcentration and determination of heavy metals in water, sediment and biological samples

    A b s t r a c t

    In this study, a simple, sensitive and accurate column preconcentration method was developed for the determination of Cd, Cu and Pb ions in river water, urine and sediment samples by flame atomic absorption spectrometry. The procedure is based on the retention of the analytes on a mixed cellulose ester membrane (MCEM) column from buffered sample solutions and then their elution from the column with nitric acid. Several parameters, such as pH of the sample solution, volume of the sample and eluent and flow rates of the sample were evaluated. The effects of diverse ions on the preconcentration were also investigated. The recoveries were >95 %. The developed method was applied to the determination of trace metal ions in river water, urine and sediment samples, with satisfactory results. The 3δ detection limits for Cu, Pb and Cd were found to be 2, 3 and 0.2 μg dm-3, respectively. The presented procedure was successfully applied for determination of the copper, lead and cadmium contents in real samples, i.e., river water and biological samples.

     

     

     

     

    Authors

    Hamid Shirkhanloo, Ahmad Rouhollahi and Hassan Zavvar Mousavi

    CONCLUSIONS

     The developed procedure is very simple, sensitive and shows high tolerance to interference ions. Due to its good analytical characteristics, such as detection limit, enrichment factor and precision, the method is suitable for trace element analysis. In addition, no modification or functionalization of the employed adsorbent is required. The recoveries of the studied analytes were nearly quantitative. The accuracy of the results was verified by analyzing a certified reference material and spiked water samples. The recoveries for these elements were very satisfactory, which evidence for the reliability of the proposed method in the analysis of real samples.

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     lead; copper; cadmium; mixed cellulose ester membrane; preconcentration

  • Simultaneous Preconcentration and Determination of Trace Amount of Lead and Copper in Water Samples by Flame Atomic Absorption Spectrometry

    A b s t r a c t

    In the present paper, a simple and sensitive method for simultaneous preconcentration and determination of lead and copper by flame atomic absorption spectrometry was developed. This method was based on solid phase extraction of lead and copper with 1-nitroso-2-naphthol-3,6-disulfonic acid chelate on naphthalene column. After preconcentration stage, the column was eluted by 5 mL of 1.2 mol L-1 nitric acid solution and metal ions directly determined by flame atomic absorption spectrometry. The effect of different variables such as pH, sample volume, amount of chelate, flow rate and eluent solution on the recovery of the analyte was investigated. The detection limits were 0.7 and 0.5 μg L-1 for lead and copper, respectively. The relative standard deviations of the determinations for analyte ions were below 4 %. This procedure was applied to the determination of lead and copper in water samples. The results demonstrated that the procedure can be applied for analysis of waters with satisfactory accuracy.

    Authors

    H. ZAVVAR MOUSAVI and H. SHIRKHANLOO

    ACKNOWLEDGEMENT

    The financial support of this work by Semnan University Research Council is greatly acknowledged.

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