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    Trace metal pollution study on cassava flour's roadside drying technique in Nigeria

    Access Status
    Fulltext not available
    Authors
    Obanijesu, Emmanuel
    Olajide, J.
    Date
    2009
    Type
    Book Chapter
    
    Metadata
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    Citation
    Obanijesu, E. and Olajide, J. 2009. Trace metal pollution study on cassava flour's roadside drying technique in Nigeria. In Appropriate Technologies for Environmental Protection in the Developing World: Selected Papers from ERTEP 2007, July 17-19 2007, Ghana, Africa, 333-339: Springer Netherlands.
    Source Title
    Appropriate Technologies for Environmental Protection in the Developing World: Selected Papers from ERTEP 2007, July 17-19 2007, Ghana, Africa
    DOI
    10.1007/978-1-4020-9139-1_32
    ISBN
    9781402091384
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/3342
    Collection
    • Curtin Research Publications
    Abstract

    Cassava flour, generally consumed in Africa as food, is a major source of carbohydrate. Its common drying technique in Nigeria is sun drying for cost optimization whereby the flour (in powder form) is spread by the roadside for moisture content reduction process. This research was carried out at five major traffic highways in Nigeria to study the level of trace element pollution introduced through this drying method, identifying the sources of the pollutants mainly as automobile exhaust emission (major) and street dust (minor). At each site, ten samples (from the four corners and the center) were collected, mixed, digested and analyzed using Graphite Furnace Atomic Absorption Spectroscopy (FAAS) technique to determine the concentration of ten elements (Fe, Cd, As, Pb, Ni, Co, Cu, Cr, Mn and Zn). Analysis of certified standard reference material IAEA-V-10 Hay (Powder) was carried out to ensure accuracy and precision of the technique. Except for zinc, all samples have comparatively high concentrations. Specifically, Fe, As, Pb, Cu and Cd have concentrations as high as 7.2, 5.70, 17.16, 4.57 and 0.39 g/70 kg respectively as against the maximum human uptake limits of 0.01, 0.014, 0.08, 0.11 and 0.03 g/70 kg respectively. The results show that even though, cassava flour is a rich source of the essential and beneficial minerals required for healthy living, it's drying technique exposes it to the excessive intake of some of these trace metals which could be hazardous to human health. Alternative drying techniques are recommended. © 2009 Springer Netherlands.

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