Deoxidation of Fenthion Sulfoxide, Fenthion Oxon Sulfoxide and Fensulfothion in Gas Chromatograph/Mass Spectrometer, and the Prevention of Sulfoxide Deoxidation by Polyethylene Glycol 300

Kuniyo SUGITATE; Takashi YAMAGAMI; Sadao NAKAMURA; Akira TORIBA; Kazuichi HAYAKAWA

doi:10.2116/analsci.28.669

Original Papers

Deoxidation of Fenthion Sulfoxide, Fenthion Oxon Sulfoxide and Fensulfothion in Gas Chromatograph/Mass Spectrometer, and the Prevention of Sulfoxide Deoxidation by Polyethylene Glycol 300

Kuniyo SUGITATE, Takashi YAMAGAMI, Sadao NAKAMURA, Akira TORIBA, Kazuichi HAYAKAWA

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JOURNAL FREE ACCESS

2012 Volume 28 Issue 7 Pages 669-673

DOI https://doi.org/10.2116/analsci.28.669

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Abstract

Fenthion, fenthion sulfoxide, fenthion oxon sulfoxide and fensulfothion showed two different mass spectra in GC/MS, depending on their concentrations. The base peaks shifted to lower levels by 1 m/z at lower concentration, and no retention time shifts were observed. The “shifted base peaks” were not obtained by a general EI fragmentation. The product ion scan spectra of the “shifted base peaks” were coincident with those of molecular ions of their corresponding sulfides. These phenomena can be ascribed to the conversion of sulfoxide into sulfide by the dominant deoxidation reaction than EI fragmentation in an ion source. Adding polyethylene glycol 300 (PEG300) into a test solution prevented sulfoxide deoxidation.

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