Effect of Ionic Strength on Mercury Adsorption on Contaminated Soil

Authors: G. Petruzzelli, F. Pedron, I. Rosellini, E. Tassi, F. Gorini, B. Pezzarossa, M. Barbafieri

Abstract:

Mercury adsorption on soil was investigated at different ionic strengths using Ca(NO3)2 as a background electrolyte. Results fitted the Langmuir equation and the adsorption isotherms reached a plateau at higher equilibrium concentrations. Increasing ionic strength decreased the sorption of mercury, due to the competition of Ca ions for the sorption sites in the soils. The influence of ionic strength was related to the mechanisms of heavy metal sorption by the soil. These results can be of practical importance both in the agriculture and contaminated soils since the solubility of mercury in soils are strictly dependent on the adsorption and release process.

Keywords: Heavy metals, bioavailability, remediation, competitive sorption.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1055433

References:

[1] D. Wang, X. Shi, S. Wie, "Accumulation and transformation of atmospheric mercury in soil," Sci. Tot. Environ., vol. 304, pp. 209-214, 2003.
[2] F. Pedron, G. Petruzzelli, M. Barbafieri, E. Tassi, "Remediation of a Mercury-Contaminated Industrial Soil Using Bioavailable Contaminant Stripping," Pedosphere, vol. 23, pp. 104-110, 2013.
[3] E. Schuster, "The behavior of mercury in the soil with special emphasis on complexation and adsorption processes: a review of the literature," Water Air Soil Pollut., vol. 56, pp. 653-667, 1991.
[4] G. Petruzzelli, "Soil Sorption of heavy metals," in Ecological Issues and Environmental Impact Assessment, P. N. Cheremisinoff, Ed. Gulf Publishing Company Houston, 1997, pp. 145-174.
[5] M. Vidal, M. J. Santos, T. Abrão, J. Rodríguez, A. Rigol, "Modeling competitive metal sorption in a mineral soil," Geoderma, vol. 149, pp. 189-198, 2009.
[6] E. Vistoso, B. K. G. Theng, N. S. Bolan, R. L. Parfitt, and M. L. Mora, "Competitive sorption of molybdate and phosphate in Andisols," J. Soil Sci. Pl. Nutr., vol. 12, pp. 59-72, 2012.
[7] G. W. Thomas, "Soil pH and soil acidity," in Methods of Soil Analysis, Part 3 - Chemical Methods, D. L. Sparks, Ed. Soil Science Society of America Book Series, Soil Science Society of America Inc., Madison, USA, 1996, pp. 475-490.
[8] M. E. Sumner, and W. P. Miller, "Cation exchange capacity and exchange coefficients," in Methods of Soil Analysis, Part 3 - Chemical Methods, D. L. Sparks, Ed. Soil Science Society of America Book Series, Soil Science Society of America Inc., Madison, USA, 1996, pp. 1201-1230.
[9] G. W. Gee, and J. W. Bauder, "Particle-size analysis," in Methods of soil analysis. Part 1. Physical and mineralogical methods, A. Klute, Ed. Agronomy Monograph N┬░9, American Society of Agronomy/Soil Science Society of America, Madison, WI., 1986, pp. 383-411.
[10] D. W. Nelson, and L. E. Sommers, "Total carbon, organic carbon and organic matter," in Methods of Soil Analysis, Part 3 - Chemical Methods, D. L. Sparks, Ed. Soil Science Society of America Book Series, Soil Science Society of America Inc., Madison, USA, 1996, pp.961-1010.
[11] U.S. Environmental Protection Agency, Method 7473, Mercury in solids and solutions by thermal decomposition, amalgamation, and atomic absorption spectrophotometry, 1998.
[12] C. H. Giles, D. Smith, A. Huitson, "A general treatment and classification of the solute adsorption isotherm. I. Theoretical," Journal of Colloid and Interface Science, vol. 47, pp. 755-765, 1974.
[13] K. F. Hayes, C. Papelis, J. O. Leckie, "Modeling ionic strength effects on anion adsorption at hydrous oxide/solution interfaces," J. Coll. Interf. Sci., vol. 125, pp. 717-726, 1988.
[14] R. Xu, Y. Wang, D. Tiwari, H. Wang, "Effect of ionic strength on adsorption of As(III) and As(V) on variable charge soils," J. Environ. Sci., vol. 21, pp. 927-32, 2009.
[15] A. Voegelin, V. M. Vulava, and R. Kretzschmar, "Reaction based model describing competitive sorption and transport of Cd,Zn, and Ni in acidic soil," Env. Sci. Technol., vol. 35, pp. 1651-1657, 2001.
[16] G. L. J. Gaines, and H. C. Thomas, "Adsorption studies on clay minerals," J. Chem Phys., vol. 21 pp. 714-718, 1953.
[17] M. C. Gabriel, D. G. Williamson, "Principal biogeochemical factors affecting the speciation and transport of mercury through the terrestrial environment," Environ. Geochem. Hlth., vol. 26, pp. 421-434, 2004.
[18] S. Gupta, K. G. Bhattacharyya, "Adsorption of Ni(II) on clays," J. Colloid Interf. Sci., vol. 295, pp. 21-32, 2006.
[19] M. R. Soares, J. C. Casagrande, E. R. Mouta, "Effects of soil solution parameters on cadmium adsorption by Brazilian variable charge soils," Commun. Soil Sci. Plan., vol. 40, pp. 2132-2151, 2009.
[20] M. R. Soares, J. C. Casagrande, and E. R. Mouta, "Nickel Adsorption by Variable Charge Soils: Effect of pH and Ionic Strength," Braz. Arch. Biol. Technol., vol. 54, pp. 207-220, 2011.
[21] F. Pedron, G. Petruzzelli, M. Barbafieri, E. Tassi, P. Ambrosini, and L. Patata, "Mercury Mobilization in a Contaminated Industrial Soil for Phytoremediation," Commun. Soil Sci. Plant Anal., vol. 42, pp. 2767- 2777, 2011.
[22] L. Cassina, E. Tassi, F. Pedron, G. Petruzzelli, P. Ambrosini, M. Barbafieri, "Using a plant hormone and a thioligand to improve phytoremediation of Hg-contaminated soil from a petrochemical plant," J. Haz. Mater., vol. 231, pp. 36-42, 2012.