Use of Poly(vinyl alcohol)-Malic Acid (CLHPMA) Hydrogels and Chitosan Coated Calcium Alginate (CCCA) Microparticles as Potential Sorbent Phases for the Extraction and Quantitative Determination of Pesticides from Aqueous Solutions

Valdés, Cristian; Valdés, Oscar; Bustos, Daniel; Abril, Diana; Cabrera-Barjas, Gustavo; Pereira, Alfredo; Villaseñor, Jorge; Polo-Cuadrado, Efraín; Carreño, Gustavo; Durán-Lara, Esteban F; Marican, Adolfo

Keywords: hydrogel, chitosan, alginate, molecular dynamics simulation, Sorbent phase, CLPHMA

Abstract

Pesticides are used worldwide to increase crop yields in agriculture. However, their toxicity and accumulation capacity can make them toxic to the environment, animals and humans. In the case of workers chronically exposed to these substances, they must be sampled continuously, so urine is an excellent option. In this sense, this study proposes to use poly(vinyl alcohol)-malic acid hydrogels, and chitosan-coated calcium alginate as new sorbent phases to be used in pesticide determination processes in urine. To better understand the behavior of these materials in the capture and desorption process, molecular dynamics simulations (MDS) were used, and desorption experiments were performed, using mechanical agitation, ultrasound, and pH variation in the desorption process, in order to optimize the parameters to obtain better recoveries. Under the optimal experimental conditions, the maximum recoveries were of the order of 11% (CFN), 3% (KCF), 53% (DMT), 18% (MTD) and 35% (MTL). Although the recoveries were not exhaustive, they are a first approximation for the use of these new sorbent phases in the determination of this type of compound in aqueous solutions and urine.

Más información

Título de la Revista: POLYMERS
Volumen: 13
Editorial: MDPI
Fecha de publicación: 2021
Página de inicio: 3993
Página final: 4013
Idioma: Inglés
URL: https://doi.org/10.3390/polym13223993