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<article language="en">
	<journal>
		<journal_title>Atmospheric Chemistry and Physics Discussions</journal_title>
		<journal_url>www.atmos-chem-phys-discuss.net</journal_url>
		<issn>1680-7367</issn>
		<eissn>1680-7375</eissn>
		<volume_number>9</volume_number>
		<issue_number>4</issue_number>
		<publication_year>2009</publication_year>
	</journal>
	<doi>10.5194/acpd-9-15541-2009</doi>
	<article_url>http://www.atmos-chem-phys-discuss.net/9/15541/2009/</article_url>
	<abstract_html>http://www.atmos-chem-phys-discuss.net/9/15541/2009/acpd-9-15541-2009.html</abstract_html>
	<fulltext_pdf>http://www.atmos-chem-phys-discuss.net/9/15541/2009/acpd-9-15541-2009.pdf</fulltext_pdf>
	<start_page>15541</start_page>
	<end_page>15565</end_page>
	<publication_date>2009-07-24</publication_date>
	<article_title content_type="html">Secondary organic material formed by methylglyoxal in aqueous aerosol mimics &amp;ndash; Part 1: Surface tension depression and light-absorbing products</article_title>
	<authors>
		<author numeration="1" affiliations="1">
			<name>A. N. Schwier</name>
		</author>
		<author numeration="2" affiliations="1">
			<name>E. L. Shapiro</name>
		</author>
		<author numeration="3" affiliations="1">
			<name>N. Sareen</name>
		</author>
		<author numeration="4" affiliations="1">
			<name>V. F. McNeill</name>
			<email>vfm2103@columbia.edu</email>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Department of Chemical Engineering, Columbia University, New York, NY, USA</affiliation>
	</affiliations>
	<abstract content_type="html">We show that methylglyoxal forms light-absorbing secondary
      organic material in aqueous ammonium sulfate and ammonium
      nitrate solutions mimicking tropospheric aerosol
      particles. The light-absorbing products form on the order of
      minutes, and solution composition continues to change over
      several days. The results suggest an aldol condensation
      pathway involving the participation of the ammonium
      ion. Aqueous solutions of methylglyoxal, with and without
      inorganic salts, exhibit surface tension
      depression. Methylglyoxal uptake could potentially change the
      optical properties, climate effects, and heterogeneous
      chemistry of the seed aerosol over its lifetime.</abstract>
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