International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2533

Full Length Research Paper

Assessment of arsenic levels in Guguletu and Langa rivers in Cape Town, South Africa

Akinsoji O.1*, Fatoki O. S.1, Ximba B. J.1, Opeolu B. O.2 and Olatunji O. S.1
1Department of Chemistry, Cape Peninsula University of Technology, Bellville, South Africa. 2Department of Environmental and Occupational Studies, Cape Peninsula University of Technology, Cape Town, South Africa
Email: [email protected]

  •  Accepted: 08 July 2013
  •  Published: 09 July 2013

Abstract

This study investigates the baseline environmental levels of arsenic (As) in two rivers; one of which traverses through Guguletu (R1) and the other running by the peripheral of Langa (R2) residential areas in Cape Town. The rivers were monitored for As in upstream, midstream and downstream stations for twelve months, during consecutive summer and winter seasons between 2011 and 2012. The collected water samples were treated with HCl and KI, and heated in a water bath at 80°C for 30 min, and As was measured using hydride generation atomic absorption spectrometer (HG-AAS). The data obtained were subjected to descriptive statistics, while the Duncan Multiple Range tests was used to compare the mean concentrations of As in the different sampling stations, and between the two rivers. The mean concentration levels of arsenic ranged R1, 0.98±0.34 to 1.23±0.43 (0.62 – 2.03) µg/L and 0.43±0.02 to 0.44±0.03 (0.08 – 0.68) µg/â„“. The highest concentration of As (2.03 µg/â„“) was observed in R1 river water during summer, and the least concentration 0.08 µg/â„“ in R2 water during winter. There was significant difference (P≤0.05) in the mean concentrations of As in R1 and R2 rivers water, while the seasonal mean concentrations during winter and summer, was not significantly different (P≥0.05). The concentrations of As detected in both rivers were lower than the recommended guideline value for freshwater.

 

Key words: Arsenic, concentration levels, seasonal, Guguletu and Langa rivers, Cape Town.