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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

Journal Article

Journal article

Turbulent transport of particle-bound PAHs: A feasibility study combining GC-APLI-MS and eddy covariance  [2016]

Stader, Christian; Christine Achten; Malte Julian Deventer; Otto Klemm;

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A novel approach combining gas chromatography-atmospheric pressure laser ionization-time-of-flight-mass spectrometry (GC-APLI-MS) with the micrometeorological eddy covariance (EC) technique is demonstrated to quantify particle-bound polycyclic aromatic hydrocarbons (PAH) mass fluxes above a central European city. During the case study, 18 different PAH compounds could be identified in two one-hour particle samples and, in combination with size-resolved particle deposition velocities obtained from EC measurements, inferred particulate PAH mass fluxes for two respective size fractions (0.060–0.108 μm and 0.170–10 μm) were quantified. Maximum concentrations and fluxes (in the order of 0.9 ± 0.09–17 ± 8 ng m−2 hr−1) were estimated for the 5-ring PAHs benzo[e]pyrene, benzo[a]pyrene and perylene. Fingerprints of PAH concentrations suggest strong pyrogenic sources, particularly wood burning.

From the journal

Atmospheric Pollution Research

ISSN : 1309-1042