Resumo

LOPEZ-REYES, Lucia et al. Adsorption of plant and bacterial carboxylic acids in agricultural soil. Terra Latinoam [online]. 2012, vol.30, n.3, pp.261-270. ISSN 2395-8030.

The rhizospheric soil interacts with substances of low molecular weight such as carboxylic acids, among other substances, whose sorption dynamics of mineral particle surface is unknown. Adsorption of water and volatile carboxylic acids from plants and bacteria (methane, ethane, propane and butane) was determined by the chromatographic method in an agricultural soil in San Juan Atenco, Puebla, Mexico. The soil under study was characterized by their physical, chemical, biological and surface properties. Porosity was determined by the method of N2 adsorption at its boiling point (76 K). Specific surface area values were determined using the method of Brunauer-Emmett-Teller (BET); pore volume was obtained using the Gursvitch rule and pore size distribution was studied by the Barrett-Joyner-Halenda (BJH) approach. The adsorption of the adsorbates was determined in the temperature range 423-523 K using gas chromatography with thermal conductivity detector and using helium as carrier gas. The Freundlich and Langmuir equations were applied to all cases. The results showed that the adsorption of water and volatile carboxylic acids, derived from biological metabolism in soil, is a function of the differential structure of molecules that impact the degree of interaction with the porous soil system.

Palavras-chave : organic acids; sorption isotherms; Langmuir and Freundlich.

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