Fig. 3.

EICs from Py-GC/MS analysis of MDI-PUR (on the left) and TDI-PUR (on the right) both with and without TMAH (red line and blue line, respectively). EIC at m/z 198 for MDA, m/z 254 for Me₄-MDA, 122 for TDA and m/z 164 for Me₃-TDA. Comparison between analyses of single PUR particles (a) and PUR mixture with a sediment matrix (b). Weights of pyrolyzed particles: (a) MDI-PUR 54.3 µg and 53.3 µg, TDI-PUR 34.9 µg and 36.8 µg (b) MDI-PUR 24.7 µg and 26.4 µg, TDI-PUR 25.5 µg and 24.5 µg, without and with TMAH, respectively. Further details cf. Fig. S7 and S8