Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

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Diatta J. 2002. EVALUATION OF ADSORPTION PARAMETERS AND CHARGE DENSITIES OF SOME SELECTED SOILS: APPLICATION TO LEAD, EJPAU 5(2), #03.
Available Online: http://www.ejpau.media.pl/volume5/issue2/environment/abs-03.html

ABSTRACT

An attempt to evaluate adsorption parameters and charge-based densities for Pb is reported in the paper. The method was based on the calculation of Langmuir adsorption maximum (a_max), and the bonding energy term (b). The parameters were the outcome of well-established linear relationships of C_e/S versus C_e (C_e, equilibrium concentration and S, amount adsorbed). The use of charge-based sorption density parameter (SD_CEC), which expressed the number of accessible charges for Pb adsorption, evidenced the occurrence of two main adsorption phases, characterised by two different slopes. The first ones, varying from 0.536 to 3.144 were suggested to be attributed to ‘high attractive sites’, whereas the second with slopes from 0.011 to 0.259, probably represented ‘low attractive sites’. Charge-based sorption density parameters elucidated more Pb adsorption behaviour than did Langmuir adsorption maximum (a

Key words: Lead, adsorption parameters, Langmuir isotherm, charge density.

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