1. Analytical and Bioanalytical Chemistry Electronic Supplementary Material Study of alkyl phosphates in industrial petroleum mixtures by comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry James J. Harynuk, Aleisha D. Rossé and G. Bryce McGarvey The following pages present experimental mass spectra of all known and suspect alkyl phosphates discussed in the manuscript

2. Triethyl phosphate Fig. S1: The following are the mass spectra of known and suspect alkyl phosphates from 35-250 m/z (due to high fragmentation, ions were not present above 250). m/z 99 common among trialkyl phosphates. m/z 127 and/or 155 are often exhibited.

3. Tripropyl phosphate

4. Tributyl phosphate

5. Fig. S2: Dialkyl phosphate TMS esters exhibit a major peak at m/z 155 and/or 171 and a minor peak at ion 77. Dibutyl phosphate TMS ester

6. Bis (2-ethylhexyl) phosphate TMS ester

7. T1

8. T2

9. T3

10. T4

11. T5

12. T6

13. T7

14. T8

15. D1

16. D2

17. D3