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Identification and Assay of an Organosilicon Contaminant in Unleaded Gasolines

Volume 42, Number 7 (Oct. 1988) Page 1265-1267

Carduner, K.R.; Carter, R.O.; Westwood, L.C.


Inductively coupled plasma-atomic emission spectroscopy is used to determine the concentration of a silicon impurity that appeared in some samples of unleaded fuel from a metropolitan area in 1984 and 1985. Silicon-29 NMR is used to identify the contaminant as the cyclic silicone, octamethylcyclotetrasiloxane. This silicone tetramer is also observed in the NMR of a commercial coating, a xylene solution of linear and cyclic silicones, used as a moisture barrier in the electronics industry.