On-line Incorporation of Cloud Point Extraction in Flame Atomic Absorption Spectrometric Determination of Silver
A cloud point extraction method was incorporated into a flow injection system, coupled with flame atomic absorption spectrometry, for determination of trace amounts of silver. The analyte in the aqueous solution was acidified with 0.2 mol L-1 sulfuric acid and complexed with dithizone. The cloud point extraction was performed using the non-ionic surfactant Triton X-114. After obtaining the cloud point, the surfactant-rich phase containing the dithizonate complex was collected in a mini-column packed with cotton wool. Then the complex was eluted by passing THF through the column and silver content was determined by flame atomic absorption spectrometry. All the chemical and flow variables were optimized and the enhancement factor was estimated to be 38. The calibration curve was rectilinear in the range of 4-220 m g L-1 and the limit of detection was 0.7 m g L-1. The precision for 6 replicate measurements at a silver concentration of 50 m g L-1 was 2.0% relative standard deviation. The proposed method was applied to the determination of silver in water samples.
On-line Incorporation of Cloud Point Extraction in Flame Atomic Absorption Spectrometric Determination of Silver
A cloud point extraction method was incorporated into a flow injection system, coupled with flame atomic absorption spectrometry, for determination of trace amounts of silver. The analyte in the aqueous solution was acidified with 0.2 mol L-1 sulfuric acid and complexed with dithizone. The cloud point extraction was performed using the non-ionic surfactant Triton X-114. After obtaining the cloud point, the surfactant-rich phase containing the dithizonate complex was collected in a mini-column packed with cotton wool. Then the complex was eluted by passing THF through the column and silver content was determined by flame atomic absorption spectrometry. All the chemical and flow variables were optimized and the enhancement factor was estimated to be 38. The calibration curve was rectilinear in the range of 4-220 m g L-1 and the limit of detection was 0.7 m g L-1. The precision for 6 replicate measurements at a silver concentration of 50 m g L-1 was 2.0% relative standard deviation. The proposed method was applied to the determination of silver in water samples.
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- K. Othmer, “Encyclopedia of Chemical Technology”, 3rded., Vol. 21, pp. 16-29, Wiley-Interscience, New York, 1982.
- E. Browning, “Toxicity of Industrial Metals”, pp. 262-267, Butterworths, London, 1961.
- “U.S. Environmental Protection Agency, Ambient Water Quality Criteria for Silver”, PB-81-11 , Washington, D.C., 1980, P.C- 128.
- “Methods For Chemical Analysis of Water and Wastes”, EPA-600/4-79-020, U.S. Environmental Protection Agency (EPA), Cincinnati, Ohio, 1979, PP. 272.1-1 and 272.2-1.
- E. Beinrohr and H. Hofbauerova, Microchim. Acta 98, 119-128 (1989).
- M. Arifurahman, S. Kaneco, Md. Nurul Amin, T. Suzuki and K. Ohta, Talanta 62, 1047-1050 (2004).
- A.A. Rusheed and M.S. Bhati, J. Radioanal. Nucl. Chem. 122, 75-81 (1988).
- Y. Ohmia, N.T.K. Dung and T. Sekine, Bull. Chem. Soc. Jpn. 70, 1867-1873 (1997).
- Y. Shijo, E. Yoshimoto, T. Kitamura, H. Ono, N. Uehara and T. Shimizu, Anal. Science 12, 959-962 (1996).
- L. Hajiagha-Babaei, Z. Ghasemi, F. Darviche, M. Shamsipur, F. RaouŞ and M.R. Ganjali, Anal. Science 17, 1308 (2001).
- E. Carasek, J.W. Tonjes and M. Scharf, Talanta 56, 185-191 (2002).
- J.L. Manzoori, M.H. Sorouradin and A.M. Hajishabani, J. Anal. At. Spectrom. 13, 305-308 (1998).
- O. Zaporozhets, N. Petruniock and V. Sukhan, Talanta 50, 865-873 (1999).
- A.K. De, S.M. Khopkar and R.A. Chalmers, “Solvent Extraction of Metals”, Van Nostrand Reinhold, London, 1970. pp. 128-133.
- W.L. Hinze and E. Paramura, Crit. Rev. Anal. Chem. 24, 133-177 (1993).
- R.L. Revia and G.A. Makharadze, Talanta 48, 409-413 (1999).
- H. Watanabe, T. Saitoh, T. Kamidate and H. Hraguchi, Microchim. Acta 106, 83-90 (1992).
- R. Carabias-Martinez, E. Rodriguez-Gonzalo, B. Moreno-Cordero, J.L. Perez-Pavon, C. Garcia-Pinto and E. Fernandez-Laespada, J. Chromatogr. A 902, 251-265 (2000).
- M. de A. Bezerra, Appl. Spectrosc. Revi. 40, 269-299 (2005).
- F.H. Quina and W.L. Hinze, Ind. Eng. Chem. 38, 4150-4168 (1999).
- C.D. Stalikas, Trends Anal. Chem. 21, 343-355 (2002).
- E.K. Paleologos, C.D. Stalikas and M.I. Karayannis, Analyst 126, 389-393 (2001).
- J.L. Manzoori and A.Bavili-Tabrizi, Anal. Chim. Acta 470, 215-221 (2002).
- M. de A. Bezerra, A.L.B. Conceicao and S.L.C. Ferreira, Microchim. Acta 154, 149-152 (2006).
- E.K. Paleologos, D.L. Giokas, S.M. Tzouwara-Karayanni and M.I. Karayannis, Anal. Chim. Acta 458, 241- (2002).
- J. Chen and K.C. Teo, Anal. Chim. Acta 450, 215-222 (2001).
- A. Safavi, H. Abdollahi, M.R. Hormozi-Nezhad and R. Kamali, Spectrochim. Acta 60, 2897-2901 (2004).
- T. Madrakian, A. Afkhami and A. Mousavi, Talanta 71, 610-614 (2007).
- J.L. Manzoori and G. Karim-Nezhad, Anal. Chim. Acta 484, 155-161 (2003).
- J.L. Manzoori and G. Karim-Nezhad, Anal. Chim. Acta 21, 173-177 (2004).
- F. Shemirani, M. Baghdadi, M. Ramezani and M.R. Jamali, Anal. Chim. Acta 534, 163-169 (2005).
- M. Garrido, M.S. Dinezio, A.G. Lista, M. Palomeque and B.S. Fernandez Band, Anal. Chim. Acta 502, 177 (2004).
- M. Trojanowicz, “Flow Injection Analysis”, pp. 68-80, World ScientiŞc Publishing Co. Singapore, 2000.
- K.A. Tony, S. Kartikeyan, B. Vijayalakshmi, T.P. Rao and C.S.P. Iyer, Analyst 124, 191-195 (1999).
- A. Ali, Y.X. Ye, G.M. Xu, X.F. Yin and T. Zhang, Micro Chem. J. 63, 365-373 (1999).
- E.K. Paleologos, A.G. Vlessidis, M.I. Karayannis and N.P. Evmiridis, Anal. Chim. Acta 477, 223-231 (2003).
- D.L. Giokas, E.K. Paleologos, S.M. Tzouwara-Karayanni and M.I. Karayannis, J. Anal. At. Spectrom. 16, 526 (2001).
- J.D. Ingle and S.R. Crouch, Spectrochemical Analysis, Prentice Hall, Englewood Cliffs, NJ, 1988.