African Journal of Pure and Applied Chemistry
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Article Number - 01105C163112


Vol.11(2), pp. 9-18 , February 2017
DOI: 10.5897/AJPAC2016.0712
ISSN: 1996-0840



Full Length Research Paper

Quantification of Cd, Cu, Pb and Zn from sewage sludge by modified-BCR and ultrasound assisted-modified BCR sequential extraction methods



Sylvia Gwebu
  • Sylvia Gwebu
  • Department of Chemistry, Faculty of Applied and Computer Sciences, Vaal University of Technology, Private Bag x 021, Vanderbijlpark, 1900, South Africa.
  • Google Scholar
Nikita T. Tavengwa
  • Nikita T. Tavengwa
  • Molecular Sciences Institute, School of Chemistry, University of Witwatersrand, Private Bag 3, Johannesburg 2050, South Africa.
  • Google Scholar
Michael J. Klink
  • Michael J. Klink
  • Department of Chemistry, Faculty of Applied and Computer Sciences, Vaal University of Technology, Private Bag x 021, Vanderbijlpark, 1900, South Africa.
  • Google Scholar
Fanyana M. Mtunzi
  • Fanyana M. Mtunzi
  • Department of Chemistry, Faculty of Applied and Computer Sciences, Vaal University of Technology, Private Bag x 021, Vanderbijlpark, 1900, South Africa.
  • Google Scholar
Sekomeng J. Modise
  • Sekomeng J. Modise
  • Department of Chemistry, Faculty of Applied and Computer Sciences, Vaal University of Technology, Private Bag x 021, Vanderbijlpark, 1900, South Africa.
  • Google Scholar
Vusumzi E. Pakade
  • Vusumzi E. Pakade
  • Department of Chemistry, Faculty of Applied and Computer Sciences, Vaal University of Technology, Private Bag x 021, Vanderbijlpark, 1900, South Africa.
  • Google Scholar







 Received: 25 November 2016  Accepted: 23 January 2017  Published: 28 February 2017

Copyright © 2017 Author(s) retain the copyright of this article.
This article is published under the terms of the Creative Commons Attribution License 4.0


Determination of the levels of heavy metals in sewage sludge is necessary prior to application of the sludge to agriculture because of the inherent risk of heavy metal toxicity to soil, plants and humans. The heavy metals (Cu, Cd, Pb and Zn) in sewage sludge were quantified using inductively coupled plasma optical emission spectroscopy (ICP-OES) following extraction with modified-BCR and ultrasonic assisted-BCR extraction methods. The quantities of heavy metals obtained from the two extraction methods were compared. The ICP-OES results indicated that in the exchangeable fraction in both extraction methods the amount of zinc released ranged from 19-227 mg kg-1, and this represented the highest concentration of metals in this fraction. Clarifier sludge contained more zinc (2375 mg kg-1) than raw sludge (310 mg kg-1). An improvement in the amount of zinc (120.8 mg kg-1) and lead (98.7 mg kg-1) released in the reducible fraction in raw sludge samples was obtained with UA-BCR extraction. UA-BCR showed that the raw sludge contained about 17 mg kg-1 of Cd while only about 0.625 mg kg-1 was released using the modified BCR extraction. Some of the metals quantified were higher than the permissible levels, and the sludge not be used for soil enrichment. The results of this study demonstrated that the modified-BCR and the ultrasonic assisted-BCR extraction methods should be used in conjunction since one method alone might not be efficient in matrix breaking and releasing metal ions into solution. This may lead to incorrect conclusions about the presence or absence of metal ions in sewage sludge.

Key words: Heavy metals, ultrasonication, sequential extraction, sludge, clarifier samples

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APA Gwebu, S., Tavengwa, N. T., Klink, M. J., Mtunzi, F. M., Modise, S. J. & Pakade, V. E. (2017). Quantification of Cd, Cu, Pb and Zn from sewage sludge by modified-BCR and ultrasound assisted-modified BCR sequential extraction methods. African Journal of Pure and Applied Chemistry, 11(2), 9-18.
Chicago Sylvia Gwebu, Nikita T. Tavengwa, Michael J. Klink, Fanyana M. Mtunzi, Sekomeng J. Modise and Vusumzi E. Pakade. "Quantification of Cd, Cu, Pb and Zn from sewage sludge by modified-BCR and ultrasound assisted-modified BCR sequential extraction methods." African Journal of Pure and Applied Chemistry 11, no. 2 (2017): 9-18.
MLA Sylvia Gwebu, et al. "Quantification of Cd, Cu, Pb and Zn from sewage sludge by modified-BCR and ultrasound assisted-modified BCR sequential extraction methods." African Journal of Pure and Applied Chemistry 11.2 (2017): 9-18.
   
DOI 10.5897/AJPAC2016.0712
URL http://academicjournals.org/journal/AJPAC/article-abstract/01105C163112

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