Authors: Colleen Marciel F. Rosales, Rheo B. Lamorena-Lim
One of the major pollutants that contributes to indoor air pollution is particulate matter (PM). PM may be categorized into different size fractions—the smaller the fraction, the greater hazard it brings to the health. Aside from its size, the chemical composition, especially the heavy metal composition, of PM is also of great concern as it may be converted into different compounds that are harmful to the human body. In this study, elemental analysis on PM collected from three indoor locations nearby a landfill area was performed using Inductively Coupled Plasma Mass Spectrometry (ICPMS). Further speciation was done using Proton Nuclear Magnetic Resonance Spectroscopy (1H-NMR). From these, it was found that PM from areas nearby landfills contain heavy metals such as manganese, cobalt, nickel, copper, arsenic, strontium, cadmium and lead, and might be attached to organic compounds and functional groups (aliphatics, aromatics and alcohols) shown in the speciation analysis. Furthermore, amounts of the heavy metals were also compared for the three locations and three size fractions. Lead and manganese are found to be more abundant on the TSP fraction, while copper is more abundant on PM2.5. A number of heavy metals are also found to be dominant on the PM10 fraction—such as manganese, arsenic, strontium, cadmium and lead.
Keywords: indoor air; particulate matter; ICPMS; NMR; speciation