Dayana Agudelo | Universidad del Norte - Barranquilla, Colombia (original) (raw)

Dayana Agudelo

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Papers by Dayana Agudelo

Research paper thumbnail of ¿Cómo mitigar la exposiCión a la contaminaCión del tráfico en los colegios y sus alrededores? Guía para niños, colegios y comunidades locales (Mitigating Exposure to Traffic Pollution In and Around Schools - Guidance for Children, Schools and Local Communities)

Research paper thumbnail of Modification, adsorption, and geochemistry processes on altered minerals and amorphous phases on the nanometer scale: examples from copper mining refuse, Touro, Spain

Environmental science and pollution research international, Jan 4, 2015

The sulfide oxidation and precipitation of Al-Fe-secondary minerals associated with abandoned aci... more The sulfide oxidation and precipitation of Al-Fe-secondary minerals associated with abandoned acid mine drainage (AMD) from the abandoned copper mine waste pile at Touro, Spain, has been studied by sequential extraction (SE) combined with several techniques with the intent of understanding the role of these processes play in the natural attenuation of hazardous element contaminants in the AMD. In addition, the fragile nature of nanominerals and ultrafine particle (UFP) assemblages from contaminated sediment systems from the abandoned copper mine required novel techniques and experimental approaches. The investigation of the geochemistry of complex nanominerals and UFP assemblages was a prerequisite to accurately assess the environmental and human health risks of contaminants and cost-effective chemical and biogeological remediation strategies. Particular emphasis was placed on the study and characterization of the complex mixed nanominerals and UFP containing potentially toxic eleme...

Research paper thumbnail of Source identification and seasonal variation of polycyclic aromatic hydrocarbons associated with atmospheric fine and coarse particles in the Metropolitan Area of Porto Alegre, RS, Brazil

Atmospheric Research, 2012

The purpose of the present study was to evaluate the polycyclic aromatic hydrocarbons (PAHs) in f... more The purpose of the present study was to evaluate the polycyclic aromatic hydrocarbons (PAHs) in fine (PM 2.5) and coarse particles (PM 2.5-10) in an urban and industrial area in the Metropolitan Area of Porto Alegre (MAPA), Brazil. Sixteen U.S. Environmental Protection Agency (EPA) priority polycyclic aromatic hydrocarbons (PAHs) were measured. Filters containing ambient air particulate were extracted with dichloromethane using Soxhlet. Extracts were later analyzed, for determining PAH concentrations, using a gaseous chromatograph coupled with a mass spectrometer (GC-MS). The polycyclic aromatic hydrocarbons (PAHs) were more concentrated in PM 2.5 with an average of 70% of total PAHs in the MAPA. The target PAH apportionment among the main emission sources was carried out by diagnostic PAH concentration ratios, and principal component analysis (PCA). PAHs with higher molecular weight showed higher percentages in the fine particles in the MAPA. Based on the diagnostic ratios and PCA analysis, it may be concluded that the major contribution of PAHs was from vehicular sources (diesel and gasoline), especially in the PM 2.5 fraction, as well as coal and wood burning. The winter/summer ratio in the PM 2.5 and PM 2.5-10 fractions in the MAPA was 3.1 and 1.8, respectively, revealing the seasonal variation of PAHs in the two fractions. The estimated toxicity equivalent factor (TEF), used to assess the contribution of the carcinogenic potency, confirms a significant presence of the moderately active carcinogenic PAHs BaP and DahA in the samples collected in the MAPA.

Research paper thumbnail of Seasonal changes, identification and source apportionment of PAH in PM 1.0

Atmospheric Environment, 2014

h i g h l i g h t s Quantification of concentrations of PAHs in PM 1.0. Mean PAHs and PM 1.0 conc... more h i g h l i g h t s Quantification of concentrations of PAHs in PM 1.0. Mean PAHs and PM 1.0 concentrations were higher in winter, particularly HMW. Diagnostic ratios and PMF analysis confirmed influence of vehicular emissions. Correlation of PAHs with meteorological parameters. BaP and DahA dominated BaPeq levels in the study area, varying with the season.

Research paper thumbnail of ¿Cómo mitigar la exposiCión a la contaminaCión del tráfico en los colegios y sus alrededores? Guía para niños, colegios y comunidades locales (Mitigating Exposure to Traffic Pollution In and Around Schools - Guidance for Children, Schools and Local Communities)

Research paper thumbnail of Modification, adsorption, and geochemistry processes on altered minerals and amorphous phases on the nanometer scale: examples from copper mining refuse, Touro, Spain

Environmental science and pollution research international, Jan 4, 2015

The sulfide oxidation and precipitation of Al-Fe-secondary minerals associated with abandoned aci... more The sulfide oxidation and precipitation of Al-Fe-secondary minerals associated with abandoned acid mine drainage (AMD) from the abandoned copper mine waste pile at Touro, Spain, has been studied by sequential extraction (SE) combined with several techniques with the intent of understanding the role of these processes play in the natural attenuation of hazardous element contaminants in the AMD. In addition, the fragile nature of nanominerals and ultrafine particle (UFP) assemblages from contaminated sediment systems from the abandoned copper mine required novel techniques and experimental approaches. The investigation of the geochemistry of complex nanominerals and UFP assemblages was a prerequisite to accurately assess the environmental and human health risks of contaminants and cost-effective chemical and biogeological remediation strategies. Particular emphasis was placed on the study and characterization of the complex mixed nanominerals and UFP containing potentially toxic eleme...

Research paper thumbnail of Source identification and seasonal variation of polycyclic aromatic hydrocarbons associated with atmospheric fine and coarse particles in the Metropolitan Area of Porto Alegre, RS, Brazil

Atmospheric Research, 2012

The purpose of the present study was to evaluate the polycyclic aromatic hydrocarbons (PAHs) in f... more The purpose of the present study was to evaluate the polycyclic aromatic hydrocarbons (PAHs) in fine (PM 2.5) and coarse particles (PM 2.5-10) in an urban and industrial area in the Metropolitan Area of Porto Alegre (MAPA), Brazil. Sixteen U.S. Environmental Protection Agency (EPA) priority polycyclic aromatic hydrocarbons (PAHs) were measured. Filters containing ambient air particulate were extracted with dichloromethane using Soxhlet. Extracts were later analyzed, for determining PAH concentrations, using a gaseous chromatograph coupled with a mass spectrometer (GC-MS). The polycyclic aromatic hydrocarbons (PAHs) were more concentrated in PM 2.5 with an average of 70% of total PAHs in the MAPA. The target PAH apportionment among the main emission sources was carried out by diagnostic PAH concentration ratios, and principal component analysis (PCA). PAHs with higher molecular weight showed higher percentages in the fine particles in the MAPA. Based on the diagnostic ratios and PCA analysis, it may be concluded that the major contribution of PAHs was from vehicular sources (diesel and gasoline), especially in the PM 2.5 fraction, as well as coal and wood burning. The winter/summer ratio in the PM 2.5 and PM 2.5-10 fractions in the MAPA was 3.1 and 1.8, respectively, revealing the seasonal variation of PAHs in the two fractions. The estimated toxicity equivalent factor (TEF), used to assess the contribution of the carcinogenic potency, confirms a significant presence of the moderately active carcinogenic PAHs BaP and DahA in the samples collected in the MAPA.

Research paper thumbnail of Seasonal changes, identification and source apportionment of PAH in PM 1.0

Atmospheric Environment, 2014

h i g h l i g h t s Quantification of concentrations of PAHs in PM 1.0. Mean PAHs and PM 1.0 conc... more h i g h l i g h t s Quantification of concentrations of PAHs in PM 1.0. Mean PAHs and PM 1.0 concentrations were higher in winter, particularly HMW. Diagnostic ratios and PMF analysis confirmed influence of vehicular emissions. Correlation of PAHs with meteorological parameters. BaP and DahA dominated BaPeq levels in the study area, varying with the season.

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