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| - Atmospheric Pressure MassSpectrometry: A New AnalyticalChemical Characterization Methodfor Dissolved Organic Matter inRainwater
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| - The complex mixture of organic compounds in theatmosphere influences climate, air quality, and ecosystemprocesses. Atmospheric pressure electrospray ionizationmass spectrometry (APESI-MS) was evaluated as a potentialtool for direct measurement of the total suite of individualdissolved organic matter (DOM) compounds in rainwater.The APESI-MS response was linear to all DOM compoundsof atmospheric significance examined as standardsolutions. Urban precipitation samples from New Brunswick,NJ (USA) were analyzed by APESI-MS over the mass-to-charge (m/z) range 50−3000. Over 95% of the m/z ionsdetected were in the low m/z range (50−500). Over 300unique m/z ions were detected across the 11 rainwatersamples indicating the complexity of the mixture of DOMin rainwater. Forty percent of the organic bases (positivemode detection) and 22% of the organic acids (negative mode)occurred in at least 6 of the 11 rainwater samples. Ionscorresponding to the m/z of carboxylic acids standards(nonanedioic acid; 1,4-butanedicarboxylic acid; pentanedioic acid; hydroxybutanedioic acid; and butanedioicacid) and to reduced N standards (allylurea; caffeine;imidazole; and N-2-propenylurea) occurred in at least oneof the 11 rainwater samples. Total dissolved organiccarbon (DOC) estimated from the APESI-MS analysis andmeasured by standard DOC methods were not statisticallydifferent.
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