Heavy metals in soils along unpaved roads in south

Authors: Veronica M NgoleJeme

Publish Date: 2015/11/17

Volume: 45, Issue: 3, Pages: 374-386

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Abstract

Soils enriched with heavy metals from vehicular emission present a significant exposure route of heavy metals to individuals using unpaved roads This study assessed the extent of Cd Cr Co Cu Ni Pb and Zn contamination of soils along unpaved roads in Cameroon and the health risks presented by incidental ingestion and dermal contact with the soils using metal contamination factor CF pollution load index hazard quotients HQ and chronic hazard index CHI CF values obtained 09–122 indicate moderate to high contamination levels HQ values for Cr Cd and Pb exceeded the reference doses Moderate health hazard exists for road users in the areas with intense anthropogenic activities and high average daily traffic ADT volume according to CHI values 1–4 obtained The economy and quality of life in cities with unpaved roads could be threatened by health challenges resulting from longterm exposure to heavy metal derived from high ADT volumesThe author acknowledges the assistance of Dr L Motsei of the mineral laboratory in Animal Health Department and Mr L Kgosieng Mr KP Mogale and Mr OD Rapetsana of the Crop Science Department all in North West University Mafikeng Campus for assistance with analyses of samples and Mr J Sakwe and Mr Ngole EE for assistance with collection of soil samples

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