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Ueta I.,Yamanashi University | Mizuguchi A.,Yamanashi University | Fujimura K.,Shinwa Chemical Industries Ltd. | Kawakubo S.,Yamanashi University | Saito Y.,Toyohashi University of Technology
Analytica Chimica Acta | Year: 2012

A novel needle-type sample preparation device was developed for the effective preconcentration of volatile organic compounds (VOCs) in indoor air before gas chromatography-mass spectrometry (GC-MS) analysis. To develop a device for extracting a wide range of VOCs typically found in indoor air, several types of particulate sorbents were tested as the extraction medium in the needle-type extraction device. To determine the content of these VOCs, air samples were collected for 30. min with the packed sorbent(s) in the extraction needle, and the extracted VOCs were thermally desorbed in a GC injection port by the direct insertion of the needle. A double-bed sorbent consisting of a needle packed with divinylbenzene and activated carbon particles exhibited excellent extraction and desorption performance and adequate extraction capacity for all the investigated VOCs. The results also clearly demonstrated that the proposed sample preparation method is a more rapid, simpler extraction/desorption technique than traditional sample preparation methods. © 2012 Elsevier B.V.

Shinwa Chemical Industries Ltd. | Date: 2012-12-26

Ion-exchange resin; packing materials for use in chromatography columns; adsorbent materials for chromatography, namely, silica gel; chromatography chemicals; chromatographic resin; packing materials for use in liquid chromatography columns. Chromatography columns for laboratory use; packed chromatographic columns for laboratory use in liquid chromatography. Chromatography columns for industrial purposes; packed chromatography columns for industrial purposes.

Shinwa Chemical Industries Ltd. | Date: 2009-07-03

Testing sample collection equipment, namely, disposable or reusable sampler needles used with samplers for laboratory use for the purpose of concentrating samples.

Shinwa Chemical Industries Ltd. | Date: 2012-03-13

Air analysis apparatus; needles for collecting, storing and concentrating air-borne substances for use with air analysis apparatus.

Shinwa Chemical Industries Ltd. | Date: 2013-12-03

Chromatography chemicals; catalytic agents; silica gel for chromatography; packing materials for use in chromatography columns; packing materials for use in gas chromatography columns; adsorbent material for chromatography, namely, chemical adsorbents for laboratory use; unprocessed artificial porous resins for use in chromatography; silicon dioxide. Chromatography apparatus for laboratory use and parts and accessories therefor, namely, columns and pre-columns; chromatography columns.

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