Study of contamination by organochlorine pesticides in the cienaga grande waters of the low sinu river valley

• Published in: Temas Agrarios
• Main Authors: Lans, Edineldo, Marrugo Negrete, José Luis, Díaz, Basilio
• Format: Article in Journal/Newspaper
• Language: Spanish; English
• Published: Universidad de Córdoba 2008
• Subjects: Pollution; Organochlorine; Water; Swamp; Contaminación; organoclorados; agua; ciénaga; Arctic
• Online Access: https://revistas.unicordoba.edu.co/index.php/temasagrarios/article/view/664

The geographic location of the Cienaga Grande allows the run-offs water from the sewers and natural or artificial water affluent establishing an exchange with the Sinu river in the dry and wet seasons. A considerable amount of chemical compounds are deposited in a direct and indirect way in the waters; therefore, the objective of the present work was to evaluate the contamination with organochlorines pesticides in the waters of the swamp. A Perkin Elmer Autosystem XL gas chromatograph equipped with an electron capture detector (ECD) and a RTX-1 capillary column were used to collect de data. α-BCH, β-BCH, γ-BCH, aldrin and heptachlorine epoxy were detected in the water samples. The determination coefficients (r²) were established using a certified standard pesticides mixture and was below 0.999 in all cases. The detection limit of the pesticides was established in the range from 0.003 to 0.311 µg L-1. The precision method was evaluated based on the relative standard deviation and in all cases was below 7%. The accuracy was evaluated as the recovery percentage and ranged between 72 and 98%. The study showed that all detected pesticides in every sample stations were above legal limits, according to Colombian regulations. La ubicación geográfica de la ciénaga Grande de Loríca, permite la captación de aguas de escorrentías provenientes de afluentes hídricos naturales y artificiales, presentando un recambio de agua con el río Sinú, en épocas seca y húmeda. Durante esta dinámica una cantidad considerable de compuestos químicos son depositados de manera directa e indirecta en aguas de la ciénaga. El objetivo del presente trabajo fue evaluar la contaminación con pesticidas organoclorados en aguas de la ciénaga. Para las determinaciones se utilizó un cromatógrafo de gases marca Perkin Elmer modelo Autosystem XL, equipado con un detector de captura de electrones (DCE) y una columna capilar RTX-1. Los pesticidas detectados en muestras de agua fueron: α-BCH, β-BCH, γ-BCH, aldrin y heptacloro epóxido. Los coeficientes de ...