A simple spectroscopic method to determine dimethoate in water samples by complex formation |
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| Authors: | Aline Romero-Natale Georgette Rebollar-Pérez Irmene Ortiz María Guadalupe Tenorio-Arvide Ricardo Munguía-Pérez Ilaria Palchetti |
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| Affiliation: | 1. Posgrado en Ciencias Ambientales, ICUAP, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico;2. Facultad de Ingeniería Química, Benemérita Universidad Autónoma de Puebla, Puebla, Mexico;3. Depto. Procesos y Tecnología, Universidad Autónoma Metropolitana-Cuajimalpa, México City, Mexico;4. Dipartimento di Chimica, Università Degli Studi di Firenze, Firenze, Italy |
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| Abstract: | ![]()
AbstractA simple and rapid method for the determination of dimethoate in water was developed based on the monitoring of the complex formation between bis 5-phenyldipyrrinate of nickel (II) and the herbicide dimethoate. The method showed a short response time (10?s), high selectivity (very low interference from other sulfate and salts), high sensitivity (limit of detection (LOD) 0.45?µM, limit of quantitation (LOQ) of 1.39?µM), and a Kd of 2.4?µM. Stoichiometry experiments showed that complex formation occurred with a 1:1 relation. The method was applied to different environmental water samples such as lagoon, stream, urban, and groundwater samples. The results indicated that independently from the water source, the method exhibited high precision (0.25–2.47% variation coefficient) and accuracy (84.42–115.68% recovery). In addition, the method was also tested using an effluent from a wastewater treatment plant from Mexico; however, the results indicated that the presence of organic matter had a pronounced effect on the detection. |
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| Keywords: | Dimethoate detection assay metal dipyrrinate organophosphorus pesticide |
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