Sample

CHEMICAL DETAILS SAMPLE ORIGIN SAMPLE PREP./SIZE PYROL. CONDITIONS TOTAL ION COUNTS

POLYETHYLENEGLYCOL (Carbowax 20M) see insert in spectrum Becker, Delft, The Netherlands suspension in methanol; 10 ug standard 2.3 X 105

REMARKS - The pyrolysis mass spectrum of Carbowax 20M shows a relatively complex pattern due to thermal degradation mechanisms and EI fragmentation processes. The strong contribution of the latter results from the fact that the aliphatic CHO-fragments produced in the thermal degradation process apparently fail to produce stable molecular ions at 14eV electron energy, thus leading to intense fragment ion series (e.g. at m/z 45, 59, 73, 87, 101). The peak at m/z 44 may be thought to represent the basic repeating subunit C9H,0 (ethyleneglycol minus H20). 1 4

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