Solid Phase Extraction of Trace Copper in Aqueous Samples Using C18 Membrane Disks Modified by Benzildithiosemicarbazone Prior to Flame Atomic Absorption Spectrometric (FAAS) Determination

Author

Department of Chemistry, Faculty of Basic Sciences, Shahrood Branch, Islamic Azad University, Shahrood, Iran

Abstract

A highly convenient, selective and sensitive procedure for pre-concentration, separation and determination of sub-ppm levels of Cu2+ in aqueous samples based on modification of octadecyl silica bonded phase membrane (OSBPM) disks is described using benzildithiosemicarbazone  (BDSC) as a powerful modifier. It was revealed that each loaded OSBPM disk with 6.0 mg of BDSC serves as excellent bead for trapping, enrichment and isolation of trace copper. The analyte was trapped during introduction the aqueous solutions through the surface of each modified membrane, quantitatively, while other interfering ions passed through the disk to drain. The adsorbed Cu2+ ions were then stripped by appropriate eluting agents followed by monitoring of the eluates by FAAS. The effects of sample pH, amount of the modifier, stripping agent types and sample flow-rates were also investigated. The described method permitted a pre-concentration factor of about 200. The detection limit of the procedure was predicted to be about 0.013 ng L-1. The method was successfully employed for recovery and quantification of trace copper in different water samples. 

Keywords


  1. Morrison G. M., 1995. Handbook on Metal-
  2. Ligand Interactions in Biological Fields, ed.
  3. G. Berthon, Marcel Dekker, New York.
  4. Moghimi A., Waqif -Husain S., Saber Tehrani
  5. M., Mohammadhosseini M., 2007. Preconcentration
  6. and determination of chromium
  7. (III) and chromium (VI) using octadecyl silica
  8. membrane disks and flame atomic absorption
  9. spectrometry. Chinese Journal of Chemistry,
  10. , 1859-1865.
  11. Mohammadhosseini M., Tehrani M. S., 2006.
  12. Solid phase extraction and determination of
  13. trace amounts of lead(II) using octadecyl
  14. membrane disks modified by a new Schiff's
  15. base and flame atomic absorption
  16. spectrometry. Journal of the Chinese Chemical
  17. Society, 53(5), 1119-1128.
  18. Mohammadhosseini M., Soliemani E., Nekoei
  19. M., 2011. Synthesis, spectral assignment and
  20. application of a new synthesized Schiff base
  21. ionophore to determination of ultra trace
  22. copper by solid phase extraction flame atomic
  23. absorption spectrometry. Analytical Chemistry
  24. Letters, 1, 300-317.
  25. Mohammadhosseini M., Tehrani M. S., Ganjali
  26. M. R., 2006. Preconcentration, determination
  27. and speciation of chromium(III) using solid
  28. phase extraction and flame atomic absorption
  29. spectrometry. Journal of the Chinese Chemical
  30. Society, 53(3), 549-557.
  31. Mohammadhosseini M., Zamani H. A.,
  32. Hashemi-Moghaddam H., Nekoei M., Noei-
  33. Aghaei M. A., 2011. Solid phase extraction of
  34. ultra trace copper using octadecyl silica
  35. bonded phase membrane disks modified by a
  36. new symmetric schiff base ionophore prior to
  37. FAAS determination. Current Analytical
  38. Chemistry, 7(4), 306-317.
  39. Noei-Aghaei M. A., Mohammadhosseini M.,
  40. Zamani H. A., Nekoei M., 2010. A
  41. comparative investigation on efficacy of two
  42. methodologies of solid phase extraction for
  43. separation and pre-concentration of trace
  44. copper in aqueous samples prior to flame
  45. atomic absorption spectrometric determination.
  46. Journal of the Chinese Chemical Society,
  47. (3A), 363-370.
  48. Reddy B. K., Kumar J. R., Reddy K. J., Sarma
  49. L. S., Reddy A.V., 2003. A rapid and sensitive
  50. extractive spectrophotometric determination of
  51. copper(II) in pharmaceutical and environment-
  52. -al samples using benzildithiosemicarbazone.
  53. Analytical Sciences, 19, 423-428.