Abstract
The 2 chromium oxidation states found in ambient atmospheric particulate matter (PM) are trivalent [Cr(III)] and hexavalent [Cr(VI)] chromium. Cr(III) is a trace element essential for the proper function of living organisms. However, Cr(VI) is toxic and exposure to Cr(VI) may lead to cancer, nasal damage, asthma, bronchitis, pneumonitis, inflammation, dermatitis, and skin allergies. Therefore, it is important to accurately discriminate between these 2 species in atmospheric PM samples. This work focuses on the effect of deliquescence and pH on chromium speciation in filter samples of airborne PM collected in the northeastern USA. The deliquescence relative humidity (DRH) and liquid water mass content determined for the ambient particle samples are in good agreement with previously reported values for ammonium sulfate and ammonium nitrate suggesting that these 2 salts control the hygroscopic properties of the ambient particles in the northeastern USA. The loss of Cr(VI) increases significantly up to 85% at...
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