Concentration and chemical composition of PM10 particles in the metropolitan area of ​Costa Rica in 2012

Ciencias Ambientales

José F. Rojas¹  Jorge Herrera²  Hazel Argüello³  Agustín Rodríguez³  Víctor H. Beita³  David Solórzano³ 

[1] Chemical and Research of the Laboratory for Environmental Analysis of the School of Environmental Sciences, University Nacional, Costa Rica;Coordinator of the Laboratory for Environmental Analysis of the School of Environmental Sciences, University Nacional, Costa Rica;Research of the Laboratory for Environmental Analysis of the School of Environmental Sciences, University Nacional, Costa Rica;

关键词: PM10;    Urban air pollution;    Polluting mobile sources;    Air samplers;    Pollution combustion;   

DOI  :  http://dx.doi.org/10.15359/rca.48-2.4

来源: DOAJ

【 摘 要 】

During 2012 the PM10 concentrations were measured in 13 sampling sites distributed in the metropolitan area of Costa Rica. The samples were collected using high volume samplers and subsequently analyzed for: ions (F-, Cl-, NO2-, NO3-, PO43-, SO42-), trace metals (V, Cr, Cu, Mn, Fe, Al, Pb, Ni), organic and elemental carbon content. Sampling sites located in high traffic commercial and industrial zones exhibited significative increased concentrations (42 – 29 µg/m3) compared to low traffic commercial and residential zones (23 – 15 µg/m3). As for speciation, crustal contribution increases from 13-14 % found in high traffic industrial zones to 28 % in residential zones. While marine aerosol contribution ranges from 2,5 to 5% for all sampling sites without a distinctive pattern. The OC and EC fraction was the most important contribution to the PM10 composition, mainly in HE-01 and BE-01 sampling sites accounting for around 53 and 56 % of the total mass. This reflects the importance of combustion sources to the fine particulate matter composition. In the case of the trace metals fraction it was the lowest one found for all the sampling sites.

【 授权许可】

Unknown