Evaluation of heavy metal accumulation in talinum triangulare grown around Municipal solid waste dumpsites in Nigeria

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Abstract

An evaluation of the accumulation of heavy metals (Cd, Cu, Fe, Ni, Pb and Zn) in Talinum triangulare plant around two municipal solid waste dumpsites in Gombe, Nigeria was carried out using Atomic Absorption Spectrophotometer. The average soil concentrations of the metals in the two dumpsites were in the order Fe>Zn>Pb>Cu>Ni>Cd while the order in Talinum triangulare was Fe>Zn>Cu>Pb>Ni>Cd. The result of soil enrichment factor implicated anthropogenic activities rather than lithogenic inputs as the sources of these heavy metals. The order of mobility (translocation) of the metals from root to shoot tissues is Cd>Pb>Fe>Ni>Zn>Cu while metal bioaccumulation trends in the plant are Cd>Fe>Cu>Zn>Pb>Ni for Bamuza dumpsite (DSS1) and Cd>Cu>Fe>Zn>Ni>Pb for BCGA dumpsite (DSS2). Thus in the two dumpsites, Talinum triangulare exhibited greatest bioaccumulation ability for Cd and least for Ni and Pb. With the exception of Cd, the roots accumulated the metals more than the shoots. The high accumulation of Cd in the shoot system is an indication of the metal’s ability to be readily translocated to plant tops after absorption by the roots. Pearson bivariate correlation indicated significant positive correlations between Cd and Cu (p<0.05); Cu and Zn (p<0.01); Fe and Ni (p<0.05) in the whole plant. Although this study did not implicate Talinum triangulare as a hyperaccumulator plant with regard to the metals studied (Cd, Cu, Fe, Ni, Pb and Zn), its high bioaccumulation of Cd in the shoot tissues is an indication that it may be risky to consume Talinum triangulare grown on dumpsites owing to the toxicity of the metal to humans.
Original languageEnglish
Pages (from-to)92-100
Number of pages9
JournalBulletin of Environment, Pharmacology and Life Sciences
Volume4
Issue number1
Publication statusPublished - Dec 2014
Externally publishedYes

Keywords

  • heavy metals
  • accumulation
  • talinum triangulare
  • enrichment factor
  • translocation factor

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