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Merck
  • Deoxidation of fenthion sulfoxide, fenthion oxon sulfoxide and fensulfothion in gas chromatograph/mass spectrometer, and the prevention of sulfoxide deoxidation by polyethylene glycol 300.

Deoxidation of fenthion sulfoxide, fenthion oxon sulfoxide and fensulfothion in gas chromatograph/mass spectrometer, and the prevention of sulfoxide deoxidation by polyethylene glycol 300.

Analytical sciences : the international journal of the Japan Society for Analytical Chemistry (2012-07-14)
Kuniyo Sugitate, Takashi Yamagami, Sadao Nakamura, Akira Toriba, Kazuichi Hayakawa
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Safrole, ≥97%
Supelco
Fenthion oxon sulfone-(S-methyl-d3), PESTANAL®, analytical standard
Supelco
Safrole, certified reference material, TraceCERT®, Manufactured by: Sigma-Aldrich Production GmbH, Switzerland
Supelco
Fenthion, PESTANAL®, analytical standard
Supelco
Fensulfothion, PESTANAL®, analytical standard