Geochemistry and risk assessment of street dust in Luanda, Angola, a tropical urban environment

Ferreira Baptista, Lopes and Miguel García, Eduardo de (2005). Geochemistry and risk assessment of street dust in Luanda, Angola, a tropical urban environment. "Atmospheric Environment", v. 39 ; pp. 4501-4512. ISSN 1352-2310. https://doi.org/10.1016/j.atmosenv.2005.03.026.

Description

Title: Geochemistry and risk assessment of street dust in Luanda, Angola, a tropical urban environment
Author/s:
  • Ferreira Baptista, Lopes
  • Miguel García, Eduardo de
Item Type: Article
Título de Revista/Publicación: Atmospheric Environment
Date: 2005
ISSN: 1352-2310
Volume: 39
Subjects:
Faculty: E.T.S.I. Minas (UPM)
Department: Ingeniería Química y Combustibles [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

A total of 92 samples of street dust were collected in Luanda, Angola, were sieved below 100 μm, and analysed by ICP-MS for 35 elements after an aqua-regia digestion. The concentration and spatial heterogeneity of trace elements in the street dust of Luanda are generally lower than in most industrialized cities in the Northern hemisphere. These observations reveal a predominantly “natural” origin for the street dust in Luanda, which is also manifested in that some geochemical processes that occur in natural soils are preserved in street dust: the separation of uranium from thorium, and the retention of the former by carbonate materials, or the high correlation between arsenic and vanadium due to their common mode of adsorption on solid particles in the form of oxyanions. The only distinct anthropogenic fingerprint in the composition of Luanda's street dust is the association Pb–Cd–Sb–Cu (and to a lesser extent, Ba–Cr–Zn). The use of risk assessment strategies has proved helpful in identifying the routes of exposure to street dust and the trace elements therein of most concern in terms of potential adverse health effects. In Luanda the highest levels of risk seem to be associated (a) with the presence of As and Pb in the street dust and (b) with the route of ingestion of dust particles, for all the elements included in the study except Hg, for which inhalation of vapours presents a slightly higher risk than ingestion. However, given the large uncertainties associated with the estimates of toxicity values and exposure factors, and the absence of site-specific biometric factors, these results should be regarded as preliminary and further research should be undertaken before any definite conclusions regarding potential health effects are drawn.

More information

Item ID: 14176
DC Identifier: http://oa.upm.es/14176/
OAI Identifier: oai:oa.upm.es:14176
DOI: 10.1016/j.atmosenv.2005.03.026
Official URL: http://www.sciencedirect.com/science/article/pii/S1352231005003110
Deposited by: Memoria Investigacion
Deposited on: 11 Feb 2013 10:54
Last Modified: 21 Apr 2016 13:42
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