2024 Volume 73 Issue 4.5 Pages 213-218
Regarding chlorinated paraffins that have attracted attention recently, we conducted a comparative study of analytical methods for medium-chain chlorinated paraffin (MCCP). To facilitate a comparison of analytical methods for MCCP, an MCCP composite was prepared by mixing fixed amounts of alkanes with 14 to 17 carbon atoms and then reacting chlorine was used as an analytical sample. Separately, a common quantitative standard descripted homolog compositional ratio was prepared, and a collaborative analysis was conducted for the 19 participating laboratories. Participating laboratories reported MCCP analytical results using liquid chromatography-, gas chromatography-, and thermal desorption-mass spectrometry. As a result, the total amount of MCCP was reported to be between 0.34 g g−1 and 1.34 g g−1, with a coefficient of variation of approximately 42 % for all the participating laboratories. Although the abundance ratio of MCCP in the quantitative standard was biased toward low carbon numbers, we were able to understand the trends of certain analytical methods, and also to evaluate the MCCP homolog compositions in this candidate reference material (the analytical sample). By continuing this activity, we hope to solve further problems with analytical methods for MCCP.
