title: Contamination and chemical fractionation of heavy metals in street dust from the metropolitan area of Monterrey, Mexico.
abstract: The prevalence of heavy metal pollution and mobility of both Pb and Cd was investigated in street dust samples from the Metropolitan Area of Monterrey (MAM) in northern Mexico. Street dust samples from 30 selected sites were analysed for their content of Zn, Cd, Pb, Cr and Ni after digestion according to U.S. EPA Method 3051. Multivariate analysis including correlation coefficient analysis, Principal Component Analysis and Cluster Analysis was used to analyse the data and identify possible sources of these heavy metals. Compared with background values, elevated concentrations of Pb (300 mg kg(-1)), Cd (7.6 mg kg(-1)) and Cr (78 mg kg(-1)) were observed in street dust of MAM. Based on multivariate statistical approaches, the studied elements were classified in three main sources: (1) Cr, Ni and Zn mainly derived from industrial activities; (2) Cd originating from traffic-related activities; and (3) Pb associated with vehicular emissions. A sequential extraction procedure using the Tessier method was applied to evaluate the mobility of Pb and Cd in street dust. The majority of Pb was associated with the residual fraction followed by the carbonate fraction. The majority of Cd was associated with the residual fraction. These results indicated that the mobility was higher in Pb (26%) compared with Cd (11%), posing a potential risk to the environment.
authors: Facultad de Ciencias Químicas, Universidad Autonoma de Nuevo Leon, San Nicolas de los Garza, Mexico.
authors: Enrique
authors: E
authors: Valdez Cerda
authors: Laura
authors: L
authors: Hinojosa Reyes
authors: Juan Manuel
authors: JM
authors: Alfaro Barbosa
authors: Perla
authors: P
authors: Elizondo-Martinez
authors: Karim
authors: K
authors: Acuña-Askar
mesh_terms: D002104:Cadmium / Q000032:analysis*; D005591:Chemical Fractionation; D002947:Cities; D004391:Dust / Q000032:analysis*; D007854:Lead / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis; D008800:Mexico; D014186:Transportation
chemical_list: D004391:Dust; D019216:Metals, Heavy; D002104:Cadmium; D007854:Lead