RESUMO
Objetivo Realizar una evaluación climática (diaria) de la concentración de metales pesados (Pb y Cu) asociada con el sedimento depositado sobre las superficies viales de las localidades de Kennedy y Puente Aranda (Bogotá D.C., Colombia). Adicionalmente, se evaluaran las concentraciones detectadas con respecto a la legislación seleccionada como de referencia para la protección de la salud humana en suelo urbano. Métodos La concentración se determinó mediante espectrometría de absorción atómica con llama; previamente las muestras fueron digeridas en una mezcla de ácido clorhídrico y nítrico (3:1; agua regia). Resultados Se evidencia con respecto a la fracción de tamaño del sedimento vial más cercana a la potencialmente inhalable desde el punto de vista de la salud pública (≤ 10 µm), que las concentraciones metálicas en promedio tienden a aumentar en tiempo seco (29 %). Al respecto, las concentraciones durante estos períodos de tiempo son en promedio 1,69 veces superiores al valor límite más bajo fijado por la normatividad de referencia. No obstante, se sugiere que las concentraciones metálicas están dominadas por el uso del suelo antes que por las condiciones climáticas. Conclusiones Los hallazgos se constituyen en un punto de referencia a nivel colombiano para la discusión y publicación de normatividad ambiental asociada con la protección de la salud humana por metales pesados, y para visualizar futuras líneas de investigación acerca del efecto del cambio climático sobre las concentraciones metálicas en ambientes urbanos.(AU)
Objective To climatically assess (daily) the concentration of heavy metals (Pb and Cu) in sediment deposited on road surfaces of the localities of Kennedy and Puente Aranda (Bogota, D.C., Colombia). Additionally, the detected concentrations are to be evaluated with respect to the legislation chosen as reference point for the protection of human health in urban areas. Methods The concentration was determined by flame atomic absorption spectrometry. The samples were previously digested in a mixture of hydrochloric and nitric acid (3:1; aqua regia). Results The results show, with respect to road sediment closest to the size that could be potentially inhaled from the point of view of public health (≤ 10 µm), that the metal concentrations on average tend to increase in dry weather (29 %). In this regard, the concentrations during these time periods are on average 1.69 times higher than the lowest limit value set by the reference legislation. However, it is suggested that the metal concentrations are mostly due to the use of the land rather than weather conditions. Conclusions The findings are a reference point in Colombia for the discussion and publication of environmental regulations associated with the protection of human health from heavy metals and for visualizing future lines of research about the effect of climate change on metal concentrations in urban environments.(AU)
Assuntos
Escoamento de Água de Chuva , Metais Pesados/química , Poluição Ambiental/análise , Análise Espectral/instrumentação , ColômbiaRESUMO
Objective To climatically assess (daily) the concentration of heavy metals (Pb and Cu) in sediment deposited on road surfaces of the localities of Kennedy and Puente Aranda (Bogota, D.C., Colombia). Additionally, the detected concentrations are to be evaluated with respect to the legislation chosen as reference point for the protection of human health in urban areas. Methods The concentration was determined by flame atomic absorption spectrometry. The samples were previously digested in a mixture of hydrochloric and nitric acid (3:1; aqua regia). Results The results show, with respect to road sediment closest to the size that could be potentially inhaled from the point of view of public health (≤ 10 µm), that the metal concentrations on average tend to increase in dry weather (29 %). In this regard, the concentrations during these time periods are on average 1.69 times higher than the lowest limit value set by the reference legislation. However, it is suggested that the metal concentrations are mostly due to the use of the land rather than weather conditions. Conclusions The findings are a reference point in Colombia for the discussion and publication of environmental regulations associated with the protection of human health from heavy metals and for visualizing future lines of research about the effect of climate change on metal concentrations in urban environments.