Effect of glucose and acetic acid on Ni, Pb and Zn transformations in contaminated soil
2007
Aziz, M.A. (University of Agriculture, Faisalabad (Pakistan). Inst. of Soil and Environmental Sciences) | Ghafoor, A. (University of Agriculture, Faisalabad (Pakistan). Inst. of Soil and Environmental Sciences) | Saifullah | Ahmad, H.R. | Sabir, M.
Organic acids and sugars are essential constituents of root exudates and have the potential to alter solubility and bioavailability of trace metals. Present study was conducted to evaluate the effect of exogenous application of glucose and acetic acid on the extractability of nickel (Ni), zinc (Zn) and lead (Pb) from contaminated soil. Soil was contaminated by adding metals and then equilibrated at field capacity for 35 days. Thereafter soil was amended with glucose and acetic acid and incubated at room temperature and field capacity for 30 days. Soil samples were taken after 5, 10, 20 and 30 days and analyzed for AB-DTPA extractable metals. Results showed that glucose and acetic acid initially enhanced the AB-DTPA extractable Ni and Zn compared to that with unamended soil, but decreased with time. In case of Pb, glucose enhanced its extractability. On the other hand, at 5, 10, 20 and 30 days of incubation, extractability of Pb decreased with acetic acid application. It was concluded that easily decomposable organic acids may temporarily enhance the metal availability to plants whereas that of Pb could decrease through precipitation of Pb as sparingly soluble compounds like PbSO4 and PbCO3. However, further research is needed to know the mechanism of Pb retention in calcareous soils upon acetic acid application.
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