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Original research (Published On: 11-May-2022 )

Behavior of 2-methyl-4-chloro-phenoxyacetic acid in rice cultivation soils of the Province of Corrientes, Argentina

N. L. Jorge

J. Chem. Res. Adv., 03 (01):10-14

N. L. Jorge : Environmental Technology Research Laboratory, Argentina

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Article History: Received on: 23-Jan-22, Accepted on: 07-May-22, Published on: 11-May-22

Corresponding Author: N. L. Jorge

Email: nelly.jorge@gmail.com

Citation: Pila AN, Bordón AG, Jorge MJ, Profeta MI, Romero JM and Jorge NL (2022). Behavior of 2-methyl-4-chloro-phenoxyacetic acid in rice cultivation soils of the Province of Corrientes, Argentina. J. Chem. Res. Adv., 03 (01 ):10-14


Abstract

Aim: This study was aimed to carry out the adsorption kinetics of MCPA on a rice crop soil, as a function of time, and to determine the influence of temperature on it by the pseudo-first and pseudo-second order models.

Method and Materials: The samples were collected in the winter of 2016 at different depths to differentiate the horizons affected by the work of the soil or for the installation of a permanent cover of vegetables used in direct seeding technique. Samples were 0-8 cm deep and the soil used in the study were brown in color (Munsell system), hydromorphic silty loam texture, 22% clay, 46% silt and 32% sand, the most important thing was high content of organic matter (OM) . The adsorbate used in this study was MCPA from Sigma-Aldrich; solutions were prepared using deionized water at three temperatures 25 ° C, 35 ° C and 45 ° C.

Results: The kinetic studies were carried out following the equilibrium technique in batch for 24 hours. A 1g soil sample was contacted with 30 mL of a 1 mg L-1 MCPA solution in CaCl2 and a follow-up was carried out taking data at 1-hour intervals during the 24 h. The adsorption capacity (qe) of MCPA was determined by the correlation: qe = V (Ci-Ce) / m, where Ci was initial concentration of MCPA (mg L-1), Ce was its concentration at equilibrium (mg L-1), V was volume of solution in liters, m was mass of adsorbent expressed in grams and qe was adsorption capacity (mg g-1). The remaining MCPA concentration was determined by HPLC.

Conclusion: It was concluded that the experimental kinetic data have a higher correlation with the pseudo-second order model. Intraparticle diffusion was also studied to see if this is the rate-limiting mechanism.


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