Determination of Paraquat residues in maize by uv-visible spectrophotometry, farms in the province of La Vega, Dominican Republic

Authors

  • Laura del Carmen Méndez Gutiérrez Pontificia Universidad Católica Madre y Maestra, Santiago, República Dominicana https://orcid.org/0000-0002-7665-6191
  • Cándida Mercedes Concepción Acevedo Universidad Tecnológica del Cibao, Cotuí, República Dominicana
  • Andy Mariela Ureña Adrian Universidad Tecnológica del Cibao, Cotuí, República Dominicana
  • Pedro Leonardo Peña Duarte Instituto de Formación Docente Salomé Ureña, sede Licey al Medio, Santiago, República Dominicana https://orcid.org/0000-0002-3746-0030

DOI:

https://doi.org/10.5377/elhigo.v14i1.17700

Keywords:

Detection; spectroscopy; herbicide; paraquat; agricultural products

Abstract

Paraquat (PQ) is a highly toxic herbicide, which requires rigorous monitoring of foodstuffs to comply with regulatory limits. The purpose of this study was to quantify PQ residues in corn (Zea May L.) by UV-Visible spectrophotometry in samples from farms located in La Vega province, Dominican Republic. The amount of reducing reagent in PQ standard solutions was optimized to obtain a determination coefficient of 0.999 and a linearity range. The limits of detection and quantification were 0.05 and 0.17 mg L-1, respectively, with a recovery of 101.7% and a coefficient of variation of less than 5%. By means of the standard addition curve, the concentration of PQ in corn was determined to be 0.56 mg L-1, which is within the limits allowed by the FDA for human consumption. In addition, it was found that there is no matrix effect, therefore, the simple calibration curve can be used for the detection of this analyte in a reliable manner. Through the simple calibration curve, PQ amounts in corn from different farms were found to be comparable to those obtained by the standard addition curve. F and Student's t-tests revealed no significant differences between PQ concentrations in corn samples from different farms (p>0.05). This study highlights the feasibility of accurate detection of PQ in corn and its consistency among different farms, ensuring that the PQ concentrations in corn samples are consistent across farms.

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Author Biographies

Laura del Carmen Méndez Gutiérrez, Pontificia Universidad Católica Madre y Maestra, Santiago, República Dominicana

Licenciada en Química y Licenciada en Educación mención Ciencias Naturales y con Maestría en Electroquímica Fundamental y Aplicada de Universidad de Los Andes, Mérida, Venezuela. Doctorado en Educación de la Universidad Rafael María Baralt, Venezuela. Con 20 años de experiencia docencia. Docente de la Pontificia Universidad Católica Madre y Maestra, Santiago, República Dominicana.

Cándida Mercedes Concepción Acevedo, Universidad Tecnológica del Cibao, Cotuí, República Dominicana

Licenciada en Educación Mención Biología y Química en la Universidad Pedro Henríquez Ureña (UNPHU). Maestría en Química en la Universidad Tecnológica del Cibao Oriental (UTECO). Con 10 años de experiencia docencia. Docente en el Centro Educativo Prof. Carlos Manuel Medina Cruz, Rincón, Jima Abajo, Rep. Dom.  

Andy Mariela Ureña Adrian, Universidad Tecnológica del Cibao, Cotuí, República Dominicana

Licenciada en Educación Mención Biología y Química, con Maestría en Química de la Universidad Tecnológica del Cibao Oriental (UTECO), Sánchez Ramírez, República Dominicana. Agrimensora de la Universidad Nacional Pedro Henríquez Ureña (UNPHU), recinto La Vega, República Dominicana. Docente del Politécnico Don Pepe Álvarez, La Vega, R.D.

Pedro Leonardo Peña Duarte, Instituto de Formación Docente Salomé Ureña, sede Licey al Medio, Santiago, República Dominicana

Licenciado en Matemáticas de la Universidad de Los Andes, Mérida, Venezuela. Maestría en Matemática Aplicada de Universidad de Oriente, Cumaná, Venezuela. Doctorado en Matemática de la de Los Andes, Mérida, Venezuela. Con más de 20 años de experiencia docente. Docente del Instituto de Formación Docente Salomé Ureña, sede Licey al Medio, Santiago, República Dominicana.

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Published

2024-06-26

How to Cite

Méndez Gutiérrez, L. del C. ., Concepción Acevedo, C. M. ., Ureña Adrian, A. M. ., & Peña Duarte, P. L. (2024). Determination of Paraquat residues in maize by uv-visible spectrophotometry, farms in the province of La Vega, Dominican Republic. Journal of Science and Technology El Higo, 14(1), 85–97. https://doi.org/10.5377/elhigo.v14i1.17700

Issue

Vol. 14 No. 1 (2024)

Section

Scientific articles

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