Determination of lead, naphthalene, phenanthrene, anthracene and pyrene in street dust|
Durán, A. C. & González, A.
Street dust is a potential source of lead exposure to humans, however scarce information about the
pollution levels with lead and polyromatic hydrocarbons exists in Venezuela, limiting the appropriate evaluation of the
levels of risk of the people. This work was aimed in the determination of the concentrations of lead, naphtalene,
anthracene, phenanthrene and pyrene in the street dust of the most transited avenues and streets of Maracay city.
Thirty street dust samples were collected at the streets and avenues, troll and bus main station. Lead was determined by
atomic absorption spectrometry after acid digestion (Pb-total), also the fractions of lead soluble in 1 M MgCl2 and 0.5
M ammonium acetate (pH = 7) were quantified. The polyaromatic hydrocarbons concentrations were determined by
capillary gas chromatography equipped with a flame ionization detector. The Pb-total ranged between 734 and 11.439
μg/g with the higher values at the most transited streets and avenues. About 60 % of samples exhibited concentrations
between 1.000 and 2.500 μg/g, similar to the values reported in the literature for soils of urban areas. The fraction of lead
soluble in magnesium accounted for less than 3 % of Pb-Total, while the 0.5 M ammonium acetate solution represented
more than the 75 % of the total loads of the pollutant. The most contaminated samples were those taken at the toll with
concentrations of 695.5 and 252.1 μg/g phenanthrene and anthracene were the most abundant, while at the bus station
all compounds were detected.
Environment; Polyaromatic hydrocarbons determination; Street dust; Urban pollution