Kimitaka Kawamura

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeasonal changes in the distribution of dicarboxylic acids in the urban atmosphereKimitaka Kawamura and Kouichi IkushimaCite this: Environ. Sci. Technol. 1993, 27, 10, 2227–2235Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 September 1993https://pubs.acs.org/doi/10.1021/es00047a033https://doi.org/10.1021/es00047a033research-articleACS PublicationsRequest reuse permissionsArticle Views1687Altm

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMotor exhaust emissions as a primary source for dicarboxylic acids in Los Angeles ambient airKimitaka. Kawamura and Isaac R. KaplanCite this: Environ. Sci. Technol. 1987, 21, 1, 105–110Publication Date (Print):January 1, 1987Publication History Published online1 May 2002Published inissue 1 January 1987https://pubs.acs.org/doi/10.1021/es00155a014https://doi.org/10.1021/es00155a014research-articleACS PublicationsRequest reuse permissionsArticle Views1357

Remote marine aerosols collected over the western North to equatorial Pacific (34°N–14°S, 140°E‐150°W) were studied for low molecular weight dicarboxylic acids using a capillary gas chromatography (GC) and GC/mass spectrometer, and for total carbon and nitrogen contents. Homologous series of dicarboxylic acids (C2–C10) including keto‐ and hydroxy‐dicarboxylic acids were detected in the samples with a concentration range of 10–250 ng m −3 (average 63 ng m −3 and median 44 ng m −3 ). Their molecul

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of organic acids (C1-C10) in the atmosphere, motor exhausts, and engine oilsKimitaka. Kawamura, Lai Ling. Ng, and Isaac R. KaplanCite this: Environ. Sci. Technol. 1985, 19, 11, 1082–1086Publication Date (Print):November 1, 1985Publication History Published online1 May 2002Published inissue 1 November 1985https://pubs.acs.org/doi/10.1021/es00141a010https://doi.org/10.1021/es00141a010research-articleACS PublicationsRequest reuse permissions

Abstract. To quantitatively evaluate the effect of carbonaceous aerosols on the south edge of the Tibetan Plateau, aerosol samples were collected weekly from August 2009 to July 2010 at Qomolangma (Mt. Everest) Station for Atmospheric and Environmental Observation and Research (QOMS, 28.36° N, 86.95° E, 4276 m a.s.l.). The average concentrations of organic carbon (OC), elemental carbon (EC) and water-soluble organic carbon were 1.43, 0.25 and 0.77 μg m−3, respectively. The concentration levels o

In order to understand the long‐range atmospheric transport of terrestrial organic matter over the open ocean, marine aerosol samples were collected on a biweekly basis from 1990 to 1993 in a remote island, Chichi‐Jima, in the western North Pacific. The samples were analyzed for lipid class compounds using a capillary gas chromatography (GC) and GC/mass spectrometry (GC/MS). A homologous series of n‐alkanes (C 20 ‐C 40 ), alcohols (C 13 ‐C 34 ), fatty acids (C 9 ‐C 34 ) and α,ω‐dicarboxylic acid

Antarctic aerosols collected at Syowa Station were studied for water soluble organic compounds by employing a water extraction and dibutyl ester derivatization and using a capillary gas chromatography (GC) and GC/mass spectrometry (GC/MS). Total carbon and nitrogen were also determined. A homologous series of α,ω‐dicarboxylic acids (C 2 –C 11 ), ω‐oxocarboxylic acids (C 2 –C 9 ), and α‐dicarbonyls (C 2 –C 3 ) were detected, as well as pyruvic acid and aromatic (phthalic) diacid. Succinic (C 4 )

Abstract. Organic molecular composition of marine aerosol samples collected during the MALINA cruise in the Arctic Ocean was investigated by gas chromatography/mass spectrometry. More than 110 individual organic compounds were determined in the samples and were grouped into different compound classes based on the functionality and sources. The concentrations of total quantified organics ranged from 7.3 to 185 ng m−3 (mean 47.6 ng m−3), accounting for 1.8–11.0% (4.8%) of organic carbon in the mar