摘要

To measure the physico-chemical property upon vaporization, thermal decomposition, and photodecomposition of polybrominated diphenylethers (PBDE), a hyphenated analytical method of headspace/gas chromatography/inductively coupled plasma mass spectrometry (HS/GC/ICP-MS) was developed. Factors that influenced the analytical performance were examined in detail, and the main problem that hindered the application of HS to PBDE analysis was found to be an elevated memory effect. This memory effect was overcome by setting the GC injection port at a high temperature, ca. 400 degrees C, and adopting a pulsed-split injection mode with a split ratio of more than 10 : 1. The repeatability of seven replicate measurements of BDE-209 (405 ng Br in 20 mL vial) was 2.1%. The temperature dependency of vaporization for 13 PBDE congeners, thermal decomposition of BDE-209 in polystylene, and photodecomposition of BDE-209 were measured by the proposed method. This method is Superior to the conventional method in the following aspects : 1) evaporation loss of the reactants and products does not take place from the headspace vial during a reaction, 2) every brominated compound, as long as it is vaporized, can be determined with equimolar sensitivity by GC/ICP-MS, and therefore, 3) the mass balance of the reaction can be calculated.

  • 出版日期2009-5