![]() Once the flame retardant material was determined, a 1-point calibration curve was prepared using a commercial standard with a known concentration. ![]() The extract was analyzed on an Agilent 6890A Gas Chromatograph/ Agilent 5973 Mass Spectrometer with a mass selective detector (MSD) using a 30 m X 0.25 mm DB-5MS (J&W Scientific) column under a flow rate of 1 mL/min. A systematic workflow for the screening and identification of new flame retardants using LC-quadrupole-time-of-flight MS and spectra-less databases based only on monoisotopic accurate mass for the identification of unknowns is described. GCMS: An extract was prepared by dissolving a small piece of plastic in dichloromethane. This analysis utilized a wavelength dispersive spectrometer (WDXRF) that is capable of detecting elements from atomic number (Z) of 4 (beryllium) through atomic number 92 (uranium) at concentrations from the low parts per million (ppm) range up to 100% by weight. XRF: X-ray Fluorescence (XRF) was performed using a Rigaku Primus II WDXRF with a rhodium X-ray source x-ray tube, vacuum atmosphere and an analysis area of 30 mm diameter. OMNIC 8.0 software was used to perform data analysis. The analytical spot size was approximately 100 microns x 100 microns. The authors have compiled the mass spectra of all 209 congeners of polybrominated diphenyl ethers (PBDEs) and around 100 other halogenated and phosphate flame retardant chemicals. FTIR: A small portion of the sample was transferred to an infrared transmitting substrate and examined using a Thermo- Nicolet 6700 Fourier Transform Infrared (FTIR) spectrometer equipped with a Continuum microscope in transmission mode. ![]()
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