Levels of trace elements in PM10 collected at roadsides of Addis Ababa, Ethiopia, and exposure risk assessment

Asamene Embiale Taye, Bhagwan Singh Chandravanshi, Feleke Zewge Beshah, Endalkachew Sahle-Demessie

doi:10.20372/nadre:9295

April 25, 2019 Journal article Open Access

Levels of trace elements in PM10 collected at roadsides of Addis Ababa, Ethiopia, and exposure risk assessment

Asamene Embiale Taye, Bhagwan Singh Chandravanshi, Feleke Zewge Beshah, Endalkachew Sahle-Demessie

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    <subfield code="a">&lt;p&gt;&amp;nbsp;Estimation of personal exposure to air pollution is needed to identify high-risk population and to&amp;nbsp;develop mitigation strategies. In this study, an assessment of the potential effects of short-term exposure to&amp;nbsp;PM10 and the elements bound within PM10 was conducted. Samples were obtained from the ten sub-cities of&amp;nbsp;Addis Ababa (three sampling points from each) during&amp;nbsp;the commuting time (traffic congestion and taxi queues).&amp;nbsp;A particle counter consisting of a portable sampling unit&amp;nbsp;with multi-fraction dust samplers was used for sample&amp;nbsp;collection. The elemental composition was analyzed by&amp;nbsp;inductively coupled plasma-optical emission spectroscopy (ICP-OES). The mean concentrations of PM10&amp;nbsp;ranged from 206 to 308 &amp;mu;g m&amp;minus;3. The highest concentrations of pollutants were found in the major open-market&amp;nbsp;part of the city, Addis Ketema. The lowest concentrations were found at the old-town, Arada sub-cities. The concentration of trace elements (Fe, Cd, As, Cr, Pb, B,&amp;nbsp;Ni, Co, Sn, Cu, and Zn) bound in PM10 ranged from&amp;nbsp;below detectable limit to 0.981 &amp;mu;g m&amp;minus;3. Regardless of&amp;nbsp;the sampling sub-city, the overall patterns of the mean&amp;nbsp;concentration of elements bound in PM10 were found in&amp;nbsp;the following increasing order of Cr &amp;lt; Cd &amp;lt; As &amp;lt; Co &amp;lt;&amp;nbsp;Ni &amp;lt; Cu &amp;lt; Fe &amp;lt; Pb &amp;lt; Sn &amp;lt; B &amp;lt; Zn &amp;lt; Mn. The results&amp;nbsp;showed that the primary source of Zn, Cr, and Cd may&amp;nbsp;be emissions from on-road vehicles, tire and brake wear.&amp;nbsp;Pb originates mainly from industries and suspended soil&amp;nbsp;dust at the roadside, whereas As, Mn, and B are associated with dust resuspension and biomass and biofuel&lt;br&gt;
combustion, respectively. The carcinogenic and non-carcinogenic risks due to chronic exposure to trace&amp;nbsp;elements bound in PM10 at the roadside were assessed&amp;nbsp;in accordance with the U.S. Environmental Protection&amp;nbsp;Agency (US EPA) guidelines. It was determined that&amp;nbsp;Mn, As, and Cd contributed substantially to the inducement of non-carcinogenic health problems to children&amp;nbsp;and adults as a result of exposure while in close proximity to the roadsides.&lt;/p&gt;</subfield>
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April 25, 2019

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Levels of trace elements in PM10 collected at roadsides of Addis Ababa, Ethiopia, and exposure risk assessment

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Levels of trace elements in PM10 collected at roadsides of Addis Ababa, Ethiopia, and exposure risk assessment

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