Comparison of Zn and Pb Adsorption in the Presence of Fulvic Acid in a Calcareous Soil

Authors

1 Former MSc student, Ferdowsi University of Mashhad

2 Professor, Soil Science Department, Faculty of Agriculture, Ferdowsi University of Mashhad

3 Associate Professor, Soil Science Department, Faculty of Agriculture, Ferdowsi University of Mashhad

Abstract

Soil is one of the most complex parts of environment that ecosystems health greatly depends on its quality. This study aimed to investigate the behavioral differences of Zn and Pb in the presence of humic substances. An experiment was conducted to measure levels of heavy metals (Zn and Pb), 6 levels of initial concentrations (0, 250, 500, 1000, 1500, 2000 mg L-1) in the presence and absence of fulvic acid in a completely randomized design with factorial arrangement. The results showed that, in the absence of fulvic acid, Pb adsorption was greater than Zn, whileits presence significantly (p< .05) increased Pb adsorption but decreased Zn adsorption in the solid phase. By using the Freundlich isotherm, it was estimated that adsorption process was chemical and, since the experimental data fitted reasonably well with the Freundlich isotherm, adsorption energy on solid surface was distributed uniformly.

Keywords

References

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Iranian Journal of Soil Research
Volume 31, Issue 3
December 2017
Pages 431-439

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