Abstract
The Pb (II) adsorption/desorption mechanism onto a natural sandy loam soil was studied by batch experiments at different pHs (3.0, 4.5, 6.0), at different ionic strength (0, 0.02 and 0.1 M) and with different electrolytes solutions of NaCl, NaAcO and NaNO3. Pb was strongly adsorbed onto the soil due to the formation of a mix of inner-sphere and outer-sphere complexes. Experimental adsorption data fitted Freundlich and Langmuir isotherms. The desorption results with 0.1 M Mg (NO3)2 and 0.1 M NaAcO solutions corroborated the mechanisms proposed. The strong binding of Pb (II) to high affinity sites on soil minerals seems to be responsible for the extent of hysteresis. The sandy loam soil under study thus constitutes a natural control for Pb contamination.
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Acknowledgments
This work has been possible thanks to Grants UNAM-PAPIIT IN−114102-3 and SEMARNAT-CONACyT 2002 C01-1420. The authors wish to thank the assistance of Jorge Servin in the laboratory work.
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Miretzky, P., Muñoz, C. & Carrillo-Chávez, A. A sandy loam soil as a natural control for Pb contamination. Environ Chem Lett 5, 131–136 (2007). https://doi.org/10.1007/s10311-007-0093-2
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DOI: https://doi.org/10.1007/s10311-007-0093-2