HUMIC-LIKE SUBSTANCES IN AIR POLLUTION PARTICULATES CORRELATE WITH CONCENTRATIONS OF TRANSITION METALS AND OXIDANT GENERATION

AbstractWe tested the hypotheses that (1) an incomplete oxidation of carbon-based fossil fuels during their combustion produces humic-like substances (HIS), which can be present in air pollution particulates and confer a capacity to complex metals; (2) air pollution particulates collected on PM10 filters can be associated with concentrations of first-row transition metals; (3) particulates can catalyze the production of free radicals by cycling these transition metals through two stable valence states; and (4) concentrations of transition metals and oxidant generation by air pollution particulates increase with the content of HLS associated with these particles. HLS were isolated by alkali extraction. The content of these substances in combustion products of coal, diesel, oil, and wood was 3.1 ± 0.8%, 4.7 ± 1.0%, 1.0 ± 0.1%, and 8.2 ± 0.6%, respectively. Similarly, filters with sequestered air pollution particulates contained HLS ranging from 0.0 to 7.1%. Elemental analysis of these materials isolated fro...

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