title: The identification of spiromesifen, a recently introduced pesticide, using approaches to chemical unknown analysis.
abstract: An unknown, viscous, opaque, white liquid with a strong, unpleasant odor was submitted with a request for identification. It was analyzed using infrared (IR) spectroscopy, gas chromatography-mass spectrometry, and X-ray fluorescence spectroscopy. It was found to contain glycerin as well as another compound. IR and mass spectral data were readily obtained for this second component, but it was not easily identified as common instrument libraries had no matching spectra. After an extensive literature search, the unknown compound was identified as spiromesifen, a recently introduced pesticide. The IR spectrum and electron impact mass spectrum of spiromesifen are presented here as these are not available in the published literature. This case report also provides useful approaches for searching for and identifying an unknown compound when it is not found in a laboratory's spectral libraries.
authors.affiliation: Washington State Patrol Crime Laboratory, 2203 Airport Way South, Suite 250, Seattle, WA 98134, USA. donna.wilson@wsp.wa.gov
authors.forename: Donna K
authors.initials: DK
authors.lastname: Wilson
authors.forename: Cynthia L
authors.initials: CL
authors.lastname: Graff